Norway has no dedicated construction legislation. Construction law is instead founded on the principle of freedom of contract, whereby the parties themselves largely determine the terms of the project through their contractual arrangements. In practice, this means that standard contracts developed by the industry – particularly the NS series – serve as the principal framework governing the majority of construction and civil engineering projects; see further at 1.2 Standard Contracts.

Background Law

Where the contract is silent or ambiguous, it is supplemented by background law. The Sale of Goods Act 1988 (kjøpsloven) constitutes the most significant source of background law in commercial construction relationships between professional parties. The Act provides guidance for the interpretation and supplementation of contractual terms. In addition, general principles of construction law, developed through case law and legal scholarship, play an important role where the contract does not provide an answer.

Key Legislation

Several statutes affect the execution of construction and civil engineering projects in practice. The Planning and Building Act (plan- og bygningsloven) regulates building matters, permits and responsibility designations. The Working Environment Act (arbeidsmiljøloven) imposes requirements relating to health, safety and the environment, as well as working conditions on construction sites. The Pollution Control Act (forurensningsloven) establishes the framework for the management of contaminated land and emissions, while the Cultural Heritage Act (kulturminneloven) imposes obligations to halt work and notify the authorities upon discovery of automatically protected cultural heritage sites. The Limitation Act (foreldelsesloven) prescribes the general time limits for the enforcement of claims, including a supplementary one-year period in cases of latent defects. With respect to dispute resolution, reference is made to the Arbitration Act (voldgiftsloven) and the Dispute Act (tvisteloven), which are discussed further in 10. Dispute Resolution.

Direct links to selected legislation (published on Lovdata) are as follows:

• the Sale of Goods Act;
• the Planning and Building Act;
• the Working Environment Act;
• the Pollution Control Act;
• the Cultural Heritage Act;
• the Limitation Act;
• the Interest on Overdue Payments Act;
• the Arbitration Act; and
• the Dispute Act.

Norwegian construction and civil engineering practice relies largely on standard contracts. The most widely used are:

• NS 8405 (construction contract, where the employer provides the design);
• NS 8407 (design-and-build contract, where the contractor bears responsibility for both design and execution);
• NS 8401/8402 (design services); and
• the subcontract standards NS 8415/8416/8417.

NS 8406/8416 (simplified construction contract) is commonly used in smaller projects. It is more condensed, with less stringent notification provisions. FIDIC is primarily encountered in projects with an international profile.

Development and Legal Status

The use of standard contracts is not prescribed by law but reflects long-standing market practice. The NS contracts are developed by Standards Norway (Standard Norge) through broadly composed committees with representatives from the employer, contractor and consultant sides, which gives them the character of negotiated, balanced documents and explains their strong standing as a basis for interpretation by the courts. In HR-2026-780-A, the Supreme Court held that deviations from the NS standard must be made expressly and visibly in the contract’s ranked documents, and that an unclear reference to a party’s own standard terms is not sufficient to set aside the regulation of the standard.

Offshore Contracts

In offshore supplies, the NF/NTK family of contracts is used, which is based on knock-for-knock principles and ad hoc arbitration. NTK 25 replaced NTK 15 at the turn of 2025/2026 through a limited revision addressing ESG requirements and sanctions regulation.

Recent Developments

The most significant development in 2026 is NS 8408, a design-and-build standard for large and complex civil engineering projects. The standard draws elements from NS 8407 and the NTK family, featuring an NTK-inspired variation order system and new provisions on ground conditions risk that provide a better basis for pricing and reduce disputes.

Integrated Project Delivery

Partnering contracts has gained increasing prevalence, particularly in public projects, with a typical two-phase structure where the parties jointly develop the design basis (phase I) and agree on a target price with shared bonus/malus for the remaining works (phase II). There is no Norwegian standard, but contract proposals developed by the Enterprise Federation of Norway (EBA) and templates prepared by public employers are used in practice; see also 7.5 Risk Sharing.

Contractual Architecture

The contractual relationships mirror the architecture of the standards: employer–contractor in NS 8405/8406/8407, designer–client in NS 8401/8402, and contractor–subcontractor in NS 8415/8416/8417, the latter with extensive back-to-back adaptation to the main contracts.

Construction and civil engineering projects in Norway are carried out by both public and private employers. On the public side, state entities such as Statsbygg, the Norwegian Public Roads Administration, Nye Veier, and Bane NOR are among the largest clients, together with municipalities and county authorities. Public employers are subject to the Public Procurement Act and the Public Procurement Regulation, which impose requirements relating to competition, procedure and award criteria. On the private side, employers range from large property developers and industrial companies to smaller local developers.

Rights and Obligations

The employer’s fundamental right is to receive performance in conformity with the contract within the agreed time and free from defects. The scope of the employer’s obligations depends on the procurement model, and in particular on whether the employer or the contractor bears responsibility for design; see 1.2 Standard Contracts.

Under the standard contracts, the employer’s core obligations include, inter alia:

• payment of the agreed remuneration;
• provision of design to the extent allocated to the employer;
• procurement of the necessary permits; and
• granting the contractor access to the construction site.

The employer normally bears the risk for ground conditions, and shall also co-ordinate with any side contractors, issue and respond to variation orders, and generally co-operate loyally in the execution of the project. See further in 3.2 Variations, 3.10 Completion, Takeover and Delivery, 4.3 Payment and 9.5 Retention and Suspension Rights.

Relationship With Subcontractors and Financiers

The employer has a direct contractual relationship with its contractors but normally has no contractual relationship with the subcontractors. Claims between the employer and a subcontractor must therefore, generally, be pursued through the contractual chain, unless separate direct agreements have been entered into. Financiers are likewise not party to the construction contract; their rights and obligations are governed by separate financing agreements. In larger PPP projects, however, direct agreements between lenders, the employer, and the contractor may secure step-in rights in the event of default; see 2.4 The Financiers.

Contractors in the Norwegian market comprise large national and international operators, regional construction firms, and specialised trade contractors in areas such as groundworks and concrete, HVAC, electrical and technical installations. Several of the largest contractors are listed companies with operations across the Nordic region. The market includes both companies that undertake design-and-build contracts and companies that exclusively perform specialised trade works as subcontractors.

Rights and Obligations

The contractor’s central right is to receive the agreed remuneration on time, together with extensions of time and additional payment in the event of variations to the contract works. The scope of the contractor’s obligations depends on the procurement model: the design-and-build contractor bears overall responsibility for both design and execution under NS 8407/NS 8408, whereas the construction contractor performs the works in accordance with the employer’s design under NS 8405.

Regardless of the model, the contractor must execute and complete the contract works in accordance with the agreed requirements and industry practice within the agreed timeframe. The contractor must remedy defects during the defects liability period, which is normally five years, and must notify the employer of errors in specifications, discrepancies in the design basis, and unexpected ground conditions. In addition, the contractor must provide the agreed insurances and securities; see 7.2 Guarantees and 7.3 Insurance.

Relationship With Subcontractors and Financiers

The contractor has a direct contractual relationship with the employer and bears full responsibility for the performance of its subcontractors vis-à-vis the employer. Subcontractors are engaged at the contractor’s own responsibility and risk, and the employer normally has no direct claims against them. The contractor likewise has no direct relationship with the project’s financiers; the role of the financiers is limited to their contractual relationship with the employer; see 2.4 The Financiers. For the contractor’s relationship with subcontractors, see also 2.3 The Subcontractors; for final settlement and limitation periods for legal proceedings, see 4.4 Invoicing and 10.1 Regular Dispute Resolution.

Subcontractors in the Norwegian market comprise both general contracting firms and specialised trade contractors in areas such as plumbing, electrical, ventilation, groundworks, concrete, painting and similar trades. In large projects, the main contractor may have a considerable number of subcontractors engaged beneath it.

Rights and Obligations

The contractual relationship between the main contractor and the subcontractor is normally governed by NS 8415 (construction subcontract), NS 8416 (simplified construction subcontract) or NS 8417 (design-and-build subcontract). The subcontractor’s central right is to receive the agreed remuneration on time, together with extensions of time and additional payment in the event of variations. The subcontractor’s obligations include executing and completing the works in accordance with the agreed requirements within the agreed timeframe, notifying the main contractor of deviations and impediments, and remedying defects during the defects liability period.

Back-to-Back Arrangements

Subcontracts are typically entered into on a back-to-back basis against the main contract, so that the terms largely mirror the obligations the main contractor has assumed vis-à-vis the employer. The concept is, however, not precisely defined in Norwegian contractual practice, and effective risk allocation requires express regulation of which provisions are actually mirrored. It is particularly important that notification periods in the subcontract are shorter than those in the main contract, and that provisions on risk allocation, variation management and limitations of liability are harmonised throughout the entire contractual chain. Paid-if-paid clauses are not entirely uncommon but may be considered unreasonable and consequently interpreted restrictively by the courts where the subcontractor’s rights are not adequately safeguarded.

Relationship With the Employer and Financiers

The subcontractor normally has no direct contractual relationship with the employer. Claims must, as a general rule, be pursued through the contractual chain via the main contractor, unless separate direct agreements have been entered into. The subcontractor likewise has no relationship with the project’s financiers. Consistent management of deadlines and notification requirements throughout the entire chain is essential to avoid the loss of claims; see also 10.1 Regular Dispute Resolution regarding the eight-month time limit.

The financing of construction projects is ordinarily provided by commercial banks, institutional investors, and public-sector bodies. The financier stands outside the construction contract and holds neither rights nor obligations arising from it. The exception is larger PPP projects, where direct agreements may grant lenders step-in rights in the event of default. For guarantees and securities, see 7.2 Guarantees to 7.4 Insolvency.

Design professionals play a key role in Norwegian construction law, as the allocation of design responsibility is one of the most dispute-generating issues in the industry. Design professionals include architects, consulting engineers, multidisciplinary consultancy firms, and specialised technical practices. In public projects, municipal or state specialist bodies may also perform design functions.

Contractual Position

The contractual position of the design professional changes fundamentally depending on the procurement model. In construction contracts, the design professional has a direct contractual relationship with the employer under NS 8401 (consultancy services at a fixed fee) or NS 8402 (assistance engagements). In design-and-build contracts, the design professional is engaged as a subconsultant to the contractor, using the same standard contracts.

Rights and Obligations

The core tasks of the design professional include developing the design basis, preparing drawings and specifications, and ensuring that the proposed solutions comply with public requirements and standards. The design professional’s central right is to receive the agreed remuneration, together with additional payment in the event of changes to the scope of the engagement.

The basis of liability is professional negligence, meaning that the consultant is assessed against whether the work has been performed with professionally sound care and diligence. The contracts contain limitations on the scope of liability (approximately NOK20 million for insurable liability) and exclude liability for indirect losses.

Professional Indemnity Insurance

The design professional’s professional liability is in practice covered by insurance, but the insurance terms may contain specific limitations – for example, where the consultant acts as a subconsultant to a design-and-build contractor (the so-called design-and-build exclusion). This may create a gap between the contractual liability the design-and-build contractor has assumed vis-à-vis the employer and the insurance coverage the consultant is able to offer. See further on insurance under 7.3 Insurance. For notification of defects and limitation periods, see 3.11 Defects and Defects Liability Period.

The scope of the works is described through functional requirements and/or detailed specifications depending on the procurement model, often structured using NS 3420 and associated description systems to ensure unambiguity in quantities and qualities. In design-and-build contracts, functional requirements with performance-based descriptions predominate, whereas construction contracts are based on detailed drawings, descriptions and bills of quantities provided by the employer.

Programme requirements, room schedules and any BIM deliverables are set out in contract appendices and form the basis for the management of variations and deviations; see 3.2 Variations. The choice of description method affects the allocation of risk, pricing methodology and the documentation available for the final settlement.

Variations are typically initiated by a written order from the employer in accordance with the contract’s variation provisions, with price adjustment and extension of time to the extent the variation affects cost and time. Under NS 8405 and NS 8407, the employer may not, without agreement, order variations representing more than 15% net addition to the contract sum.

The Supreme Court’s decision in HR-2025-977-A clarifies that NS 8407 operates a dual-track system for the calculation of the 15% threshold for variations: the concept of “variation” applies only to orders that entail a deviation from the contractor’s obligations under the contract. Unforeseen additional work required to achieve the contract’s requirements may be at the employer’s risk. This will typically include unforeseen ground conditions. Such additional work entitles the contractor to a price adjustment, but it is nevertheless not counted towards the 15% threshold, as it is not defined as a “variation”.

Irregular Variation Orders

Where the employer issues instructions that in substance constitute variations without following the formal variation order procedures (so-called irregular variation orders), the contractor is also obliged to carry out the work but must notify the employer without undue delay if the instruction is invoked as a variation. The notification obligation is mutual: the contractor may forfeit the right to additional payment in the event of late notification, and the employer may forfeit the right to contest the variation if objections are not raised within the contractual time limits.

Contractor-Initiated Claims

The contractor does not have a general right to demand variations but may submit claims for additional payment and extensions of time where circumstances within the employer’s sphere of risk affect the performance – for example, errors in the employer’s design, unforeseen ground conditions, or delayed deliveries on the part of the employer. The requirement of timely notification applies equally as a prerequisite for such claims.

Pricing of Variations and Time-Related Costs

The price for variations is determined either by agreed unit rates, cost-plus (time and materials) or an agreed new price. Time-related costs (costs associated with prolonged construction time) are priced separately, and in larger projects fixed formulae for the calculation of such costs are often agreed, entitling the contractor to automatic compensation upon extension of time. Schedule impacts shall be reflected in an updated programme with documentation of cause and effect; see 5.2 Delays to 5.4 Extension of Time.

The NS 8408 Variation Order System

The traditional variation order system described above has been radically restructured in the new standard NS 8408, which follows a system known from the NTK contracts (offshore construction).

Design responsibility rests with the employer in construction contracts (NS 8405), whereas the design-and-build contractor bears responsibility for design in design-and-build contracts (NS 8407/NS 8408), including co-ordination of consultants and disciplines.

In practice, shared design responsibility also occurs, typically where the employer provides a preliminary design or programme of requirements and the design-and-build contractor carries out the detailed design. The interface between the two is a classic source of disputes, and precise contractual regulation of the transfer of responsibility is essential.

Liability for Design Errors

Liability for design errors is borne by the party carrying design responsibility, with professional negligence as the basis of liability for consultants and strict performance liability for the design-and-build contractor vis-à-vis the employer. Independent verification and the system of responsibility under the Planning and Building Act entail separate roles (responsible applicant, responsible designer, responsible constructor and responsible verifier) that affect interfaces and regulatory supervision.

Complex Projects Under NS 8408

In large civil engineering projects under NS 8408, the variation and collaboration mechanisms are further developed to manage complex design and interfaces during the early phases of the project.

The division of responsibility in the construction process depends on the procurement model. In divided contracts (employer-managed), the employer contracts directly with several side contractors and bears the co-ordination responsibility itself, often through an engaged construction manager or project manager. In general contracts, a single main contractor assumes co-ordination responsibility for the subcontractors, while the employer retains responsibility for design. In design-and-build contracts, the contractor bears the most comprehensive responsibility – encompassing design, execution, progress and management of the entire subcontract portfolio.

Roles of Subcontractors, the Employer and the HSE Co-Ordinator

Subcontractors carry out specialised works under the main contractor’s direction and co-ordination. The employer, for its part, contributes decisions, access to the construction site, permits and supervisory functions. In addition, the employer is required by law to appoint an HSE co-ordinator (health, safety and the working environment) responsible for safeguarding safety on the construction site throughout the project.

Testing, Commissioning and Takeover

Testing, commissioning and takeover procedures should be incorporated into the progress schedule with clear milestones and takeover criteria; see 3.9 Tests, 3.10 Completion, Takeover and Delivery and 5.1 Planning and Programme.

The allocation of risk for ground conditions is contractually governed and follows the fundamental principle that the contractor bears the risk for conditions it had reason to anticipate at the time of tender, while the employer bears the remaining risk. The assessment depends to a large extent on the information that was available during the tender phase: the tender documents will normally contain information on pollution, underground obstacles, geotechnical conditions and any archaeological finds. The employer is obliged to provide all known information regarding ground conditions of relevance to the contractor, and incorrect information is, as a general rule, at the employer’s risk. The contractor, for its part, must carry out a diligent inspection of the site and, under NS 8407, obtain available information on cables, pipes and other ground conditions.

Differences Between the Standard Contracts

There are important nuances between the standards. Under NS 8405, the design responsibility rests with the employer, who consequently bears the greater part of the ground conditions risk. Under NS 8407, the contractor is subject to a more extensive duty of investigation prior to submission of the tender, and it may be agreed that the risk of unforeseen ground conditions is allocated to the design-and-build contractor (except for material deviations) – a solution that is also prevalent among large public employers.

NS 8408 introduces an adjusted risk regime tailored to large civil engineering projects, with a clearer allocation of who shall procure ground investigations, what information shall be made available at the time of tender, and how deviations from the assumptions shall be notified and managed contractually. The aim is to provide the contractor with a more predictable basis for pricing risk and to reduce the number of disputes concerning ground conditions.

Mandatory Regulation

Regardless of the contractual regime, mandatory regulation applies in respect of archaeological finds and pollution: the Cultural Heritage Act triggers an obligation to halt work and notify the authorities upon discovery of automatically protected cultural heritage sites, while the Pollution Control Act governs the management of contaminated land; see also 1.1 Governing Law.

The building permit process under the Planning and Building Act normally requires a framework permit, a commencement permit, a temporary occupancy permit and a completion certificate. This is governed by statute and cannot be derogated from by the parties. The Planning and Building Act also establishes a system of responsibility roles:

• the responsible applicant (typically the architect or a consultancy firm) co-ordinates the building permit process vis-à-vis the municipality;
• the responsible designer confirms that the proposed solutions comply with the regulatory requirements;
• the responsible constructor carries out the works in accordance with the permit; and
• the responsible verifier independently verifies that the requirements have been met.

Allocation of Responsibility for Permits

In practice, it is the employer, through the responsible applicant, who obtains the framework permit. The contractor normally assists with the commencement permit, the temporary occupancy permit and the completion certificate. In the absence of any other agreement, the risk that the necessary permits are in place on time rests with the employer.

Sector-Specific Permits

For major energy and infrastructure projects, additional sector-specific permits may be required – for example, a licence under the Energy Act for wind power and power line projects, a permit under the Harbour and Fairways Act for works at sea, or a discharge permit under the Pollution Control Act. Responsibility for such permits rests, as a starting point, with the employer.

Maintenance works typically encompass ongoing operation, preventative measures, and repair of damage not attributable to defects. Following takeover, the employer is responsible for maintenance. The parties may agree on a trial operation period; NS 6450 establishes processes for commissioning and trial operation to ensure that technical installations function as planned.

Separate Maintenance Contracts

In certain sectors, particularly infrastructure and energy, the contractor may assume maintenance obligations for an agreed period following takeover under separate service or maintenance contracts.

Operation, financing and ownership of the completed works are normally not regulated in the construction contract. The exception is public-private partnerships (PPPs), where a private party undertakes to finance, construct, operate and maintain the infrastructure for an agreed concession period before transfer to the public sector.

Testing and commissioning typically follow a staged process comprising factory tests, on-site tests, mechanical completion, functional testing and performance tests. Roles, procedures and acceptance criteria are regulated in the contract and associated appendices, and should correspond with the conditions set out in the takeover protocol; see 3.10 Completion, Takeover and Delivery.

Responsibilities of the Contractor and the Employer

The contractor bears the primary responsibility in the testing process. It is the contractor who plans, carries out and documents the tests, and who bears the cost and risk of failed tests until takeover. If a test is not passed, the contractor must remedy the deficiency and re-test at its own cost until the acceptance criteria are met.

The employer’s role is to make the necessary infrastructure available for testing – for example, power, water and access to the facility – as well as to participate in or approve test procedures and to accept or reject the test results. In projects involving technical installations, testing and takeover often proceed in stages, and detailed test procedures with clear acceptance criteria for each stage are recommended. 

In Norwegian construction law, the takeover inspection constitutes the central point at which the contract works are deemed delivered from the contractor to the employer. In HR-2026-965-A, the Supreme Court held that takeover under the standard contracts may, as a starting point, only occur through a formal takeover inspection in accordance with the contract’s provisions, and that the employer’s use of the contract works does not in itself constitute takeover. There is accordingly no separate delivery stage distinct from takeover – completion, takeover and delivery are in practice parts of one continuous process.

Completion and the Takeover Inspection

Completion entails that the contractor has finished the contract works in accordance with the agreement, that the necessary tests have been passed (see 3.9 Tests) and that the required documentation is in place. Once these conditions are satisfied, the contractor shall summon the employer in writing to a takeover inspection. At the takeover inspection, minutes are recorded identifying those present, listing any defects with a deadline for remediation, and stating whether the contract works have been taken over or refused with reasons.

Legal Effects of Takeover

Takeover triggers several key legal effects. The employer obtains the right to put the contract works into use, and the risk of loss of and damage to the contract works passes to the employer. Liquidated damages (a pre-agreed daily amount for delay) cease to accrue. The contractor’s security is reduced from 10% to 3% of the contract sum with effect for three years, the defects liability period commences, and the final settlement process is triggered with deadlines for the final account and final invoice.

Partial Takeover and Unjustified Refusal

Partial takeover may be agreed for identified parts of the contract works and affects remuneration, deadlines and the scope of the guarantee for the part taken over. If the employer unjustifiably refuses to take over, the contractor may demand that takeover be established, with consequential effects for risk, liquidated damages and final settlement.

The notification periods for defects are contractually agreed and may be derogated from by the parties. In order to pursue a claim for defects, the employer must under all Norwegian standard contracts notify the contractor of the defect within a short time after the defect was or ought to have been discovered. In addition, the notification must be made within the maximum notification period for defects, which is normally five years from takeover. If the notification periods have been exceeded, the employer’s claim is forfeited unless the defect is attributable to wilful misconduct or gross negligence. For parts of the contract works that have been remedied, a new five-year period runs from completion of the remediation, limited to a maximum of one year beyond the original period.

Limitation Periods

In addition, the employer must comply with the Limitation Act, which is mandatory. The Act prescribes a general limitation period of three years from takeover, with a supplementary one-year period for latent defects running from the time the employer obtained or ought to have obtained knowledge of the defect. Limitation may accordingly occur before the expiry of the notification period, and the employer must ensure that limitation is interrupted in parallel, if necessary, by commencing legal proceedings or entering into an agreement to extend the period. If the period is exceeded, the claim is forfeited.

Remedies Before and After Takeover

Prior to takeover, the contractor’s duty to remedy defects is strict and linked to contractual performance. Following takeover, the primary remedy is rectification within a reasonable time, provided that the costs are not disproportionate in relation to the result the rectification would achieve. Where rectification is not appropriate, the employer may instead claim a price reduction or damages. In the event of material breach, the contract may as a last resort be terminated.

The contract price is normally established through a tender process in which the employer invites tenders and the contractor prices the works based on the tender documents. The most common forms of remuneration are fixed price, unit rates, cost-plus (time and materials) and target price. In partnering contracts, a target price combined with bonus/malus is frequently used, meaning a bonus to the contractor if the final cost falls below the target price, and reduced compensation in the event of an overrun. The forms of remuneration may also be combined within one and the same contract.

Components of the Contract Price

The contract sum is typically broken down into site establishment and running costs, materials, labour, and provisions and profit. The parties support this with a payment schedule setting out when the various components fall due.

Milestone Payments

Milestone payments are common in Norwegian construction contracts. The parties typically agree that portions of the remuneration fall due upon the achievement of defined milestones, in addition to ongoing monthly instalments based on documented progress. See further on payment under 4.3 Payment.

Price indexation is common and is typically carried out on the basis of indices published by Statistics Norway (SSB), which cover various project types, including indices for apartment buildings, timber-framed detached houses, road works and pipelines, enabling the parties to select the index that best reflects the cost composition of the project in question.

Contractual Mechanisms

Most standard contracts contain price adjustment clauses linking price elements to an index according to an agreed method, unless otherwise agreed. The total index method entails that the contract sum is adjusted based on the movement in the chosen index from an agreed base month (normally the month of the tender deadline) to the month of execution, typically with quarterly or monthly settlements.

Derogation and Extraordinary Price Fluctuations

Price indexation may also be agreed as a fixed amount, or alternatively excluded altogether – for example, in market conditions with a short execution period or low-price volatility. Extraordinary price fluctuations falling outside the normal scope of index regulation must, if applicable, be addressed through separate contractual mechanisms.

Invoiced amounts ordinarily fall due within 28 calendar days of receipt, and the standard contracts provide for interest on late payment in accordance with the Interest on Overdue Payments Act. The rate of interest on late payment is set by the Ministry of Finance every six months and is 12% as of the first half of 2026. Advance payments are common and normally require security in the form of a bank guarantee.

Retention and Withholding

Under NS 8405, NS 8406 and NS 8407, the employer may withhold an agreed proportion of the invoiced amount as retention, which does not fall due until the final settlement. The employer may also withhold further payment where legitimate counterclaims exist.

Suspension for Non-Payment

In the event of material payment default by the employer, the contractor may suspend performance provided that prior written notice has been given affording the employer a cure period of not less than 24 hours. A justified suspension entitles the contractor to an extension of time and compensation.

Documentation Requirements

For an invoice to be deemed due and trigger interest on late payment, it must comply with the contract’s documentation requirements to enable the employer to verify the claim. The employer must, for its part, object before the due date if the documentation is considered insufficient.

Ongoing invoicing is normally carried out on a monthly basis on the strength of documented works performed. Under NS 8405, NS 8406 and NS 8407, invoices must be paid within 28 days of receipt. For an invoice to be deemed due and trigger interest on late payment, it must comply with the contract’s documentation requirements to enable the employer to verify the claim. The employer must, for its part, object before the due date if the documentation is considered insufficient.

Final Settlement

The final settlement follows detailed procedural rules designed to ensure verifiability and to preclude subsequent claims. The contractor shall normally submit the final account and final invoice within two months of takeover. The final account shall contain a comprehensive overview of all claims, including the original contract sum, agreed and disputed variations, index regulation, retention and any counterclaims.

The employer must raise objections within two months of receipt of the final account. Claims not included in the final account, or objections not raised within the deadline, may as a general rule not be pursued subsequently. Both parties forfeit the right to claims and objections that are not submitted in due time. The final settlement thus functions as a definitive settlement point binding on both parties. Disputed claims are subject to an eight-month time limit for commencing legal proceedings calculated from takeover; failure to comply may result in forfeiture of the claim; see 10.1 Regular Dispute Resolution. Under NS 8408, this applies to all unpaid claims.

Under NS 8405 and NS 8407, the contractor must submit a progress schedule within four or six weeks of the conclusion of the contract. The schedule must as a minimum cover the contractor’s main activities and activities upon which the contractor is dependent, including works carried out by the employer’s other contractors. In larger projects, detailed planning requirements at multiple levels are often agreed, comprising a contract baseline, detailed schedules, and associated reporting and documentation requirements.

Monitoring and Revision

The contractor is under a continuing obligation to inform the employer of actual progress and to notify the employer of material deviations from the schedule. In the event of material deviations, the contractor must submit a revised schedule. Planning is normally structured around a critical path – that is, the longest chain of dependent activities determining the project’s completion date – so that both the parties and any disputes can be related to the activities that actually affect completion.

The Employer’s Role

The employer contributes to the planning process through decisions, access, permits and clarifications that are prerequisites for planned progression. The employer normally approves the progress schedule and must itself meet its own milestones, including delivery of design, permits and access to the construction site.

Milestones and Milestone Payments

Milestones are common in Norwegian construction contracts and are used both as a management tool and as a contractual basis for sanctions. The parties may agree that milestones are subject to liquidated damages (0.1% of the contract sum per working day, capped at 10%); see 5.3 Remedies in the Event of Delays.

Milestone payments are also common, with portions of the remuneration falling due upon documented achievement of defined milestones; see 4.1 Contract Price. Certificates in the traditional FIDIC sense are not normally used in Norwegian practice, but documentation of milestone achievement serves an equivalent function.

In the event of delays, both parties are obliged to notify the other party without undue delay. Timely notification is a prerequisite for preserving the right to an extension of time; failure to notify or late notification may result in forfeiture of the claim.

Extensions of Time and Additional Payment

Delay attributable to variations or circumstances within the employer’s sphere of risk may entitle the contractor to an extension of time and additional payment. Correspondingly, the employer may be entitled to an extension of time where the contractor obstructs the employer’s co-operation.

Time-Related Costs and Liquidated Damages

In the event of delays, the contractor’s claim for price adjustment may include increased time-related costs (costs associated with prolonged construction time); see further in 3.2 Variations. Where there is no basis for an extension of time, the delay constitutes a breach of contract and the employer’s primary sanction is liquidated damages; see 5.3 Remedies in the Event of Delays.

Concurrent Delays

In cases of concurrent or parallel delays, where the parties are each responsible for their respective cause, it is a disputed question how the contractor’s entitlement to an extension of time and compensation should be calculated. Case law is to some extent inconsistent. There are examples of the contractor being relieved of liquidated damages but losing the right to price adjustment for prolonged construction time. Alternatively, a proportionate allocation of both liquidated damages and price adjustment may also be applied.

The employer’s remedies in the event of delay by the contractor are liquidated damages, damages for excess loss in cases of gross negligence or wilful misconduct, and termination in the event of material breach, including where it is clear that material delay will occur.

Rates and Caps

Under NS 8405, NS 8406 and NS 8407, daily liquidated damages accrue at a rate of 0.1% of the contract sum for each working day of delay, subject to an overall ceiling of 10% of the contract sum. The employer’s entitlement to liquidated damages is not conditional upon proof of actual financial loss.

Interim Deadlines and Agreed Deviations

The final deadline is, as a general rule, subject to liquidated damages, but the parties may also agree on interim deadlines linked to milestones that are likewise subject to liquidated damages. The parties may agree on different rates and caps. In the event of wilful misconduct or gross negligence on the part of the contractor’s senior personnel, the employer may instead claim damages for the full documented delay loss in excess of the liquidated damages. Cumulation and caps in respect of direct and indirect losses are addressed in 9.4 Excluded Damages to 9.6 Termination.

Under all the standard contracts, the contractor is entitled to an extension of time in the event of variations, delays or deficiencies in the employer’s performance, and other circumstances within the employer’s sphere of risk.

Procedure and Measurement

Claims are submitted by written notification without undue delay, and the extension of time shall correspond to the actual and necessary impact of the impediment on the critical path. Account shall be taken of concurrent delays, necessary stoppage periods, and any shift to a more or less favourable season.

The contractor bears the burden of proof for both the grounds and the extent of the claim on the balance of probabilities. Procedural and preclusion rules require loyal and timely handling in order to preserve claims.

Acceleration

Where the parties disagree on an extension of time, acceleration may be a means of recovering lost time. Acceleration may occur in three forms.

Instructed acceleration entails that the employer instructs the contractor to accelerate the works and bears the additional costs where the delay is attributable to circumstances within the employer’s sphere of risk.

Voluntary acceleration entails that the contractor accelerates on its own initiative in order to avoid liquidated damages and itself bears the risk of the additional costs.

Defensive acceleration gives the contractor a limited right to accelerate at the employer’s expense where the parties are unable to agree on an extension of time, provided that the acceleration costs do not exceed a specified level. This mechanism provides the contractor with an alternative course of action where the extension of time claim is disputed.

Force majeure is recognised as a general principle of Norwegian contract law. Under the NS contracts, force majeure captures external circumstances such as exceptional climatic events, regulatory prohibitions and industrial action. Relief requires that:

• a qualifying impediment has arisen outside the affected party’s sphere of influence;
• the event could not reasonably have been anticipated; and
• its effects could not reasonably have been averted.

Consequences

Neither party is treated as being in default. An extension of time is granted, but price adjustment is not normally available. The affected party must notify the other party without undue delay.

Unforeseen circumstances are primarily addressed contractually through risk allocation rules in the standard contracts, which allocate risk for specific circumstances such as unforeseen ground conditions (see 3.5 Site) and changes in public requirements. Hardship clauses may provide a negotiation mechanism. In exceptional cases, Section 36 of the Contracts Act may be invoked, but the threshold is very high in commercial relationships. Unforeseen circumstances may also qualify as force majeure; see 5.5 Force Majeure.

Disruption is recognised as a ground for claims for both extension of time and compensation where the causes are attributable to the employer and are sufficiently documented.

NS 8405 and NS 8407 expressly provide that “reduced productivity” may constitute a basis for additional payment. The Supreme Court’s decision in HR-2019-1225-A (HAB) clarifies the evidentiary requirements: the contractor must individualise the specific events, document which work operations have been affected and during which periods and demonstrate on the balance of probabilities that the consequences have in fact resulted in the alleged additional costs. Globally calculated claims are not normally accepted. General experience and norm-based calculations may be a factor in the assessment of the loss but are alone not normally sufficient to document productivity loss in the specific project.

Relationship to Extension of Time

Claims for extension of time must in principle be based on the underlying cause that has created the disruption or reduced productivity. NS 8405 and NS 8407 provide that the cumulative effect of previously notified variations and events must also be taken into account when assessing the schedule impact, so that accumulated variations and employer-related impediments may collectively form the basis for time compensation.

Norwegian law precludes contractual exclusion of liability for criminal liability, personal injury, product liability under mandatory statutory regimes, and duties arising under international conventions. The standard contracts do not limit liability by means of general caps but regulate indirect losses; see 9.4 Excluded Damages.

Wilful misconduct and gross negligence are central concepts that override agreed limitations of liability. The standard contracts provide that limitations and notification periods do not apply in such cases.

Pursuant to the principle of freedom of contract, the parties are free to agree on liability caps and other limitations. NS 8405 and NS 8407 do not contain a general liability cap, but in practice the parties frequently agree on differentiated limitations, including exclusion of indirect losses, liquidated damages as the specific and exclusive remedy for delay, and special clauses for particular risks.

It is primarily the contractor’s and the design professional’s liability that is limited in practice – through liability caps, caps on liquidated damages (normally 10% of the contract sum) and exclusion of indirect losses. The employer’s liability is less frequently limited but may also be circumscribed contractually.

Norwegian courts and arbitral tribunals will, generally, uphold agreed limitations of liability. The limitations may, however, be set aside where the loss is attributable to wilful misconduct or gross negligence on the part of the responsible party’s senior personnel; see 6.2 Wilful Misconduct and Gross Negligence.

Indemnity clauses are uncommon in the NS contracts. Risk is instead allocated through the standards’ other liability and compensation provisions. Offshore and energy contracts, by contrast, frequently employ knock-for-knock arrangements with mutual hold-harmless obligations for each party’s own personnel and property.

Bank guarantees and parent company guarantees are commonly agreed in order to secure performance.

Contractor’s Security

Under NS 8405 and NS 8407, the contractor’s default obligation is to furnish security corresponding to 10% of the agreed contract sum throughout the execution phase, stepping down to 3% upon takeover for a residual guarantee period of three years. On-demand guarantees, under which the guarantor may not invoke the contractor’s objections, are not required under the standard contracts. Requirements for such guarantees may nevertheless be encountered in larger projects and/or international contexts. Parent company guarantees may be required where the contractor is a subsidiary.

Employer’s Security

Under NS 8405 and NS 8407, the employer is in principle required to post reciprocal security of 15% or 17.5% of the contract sum. In practice, this obligation is frequently waived for employers of established financial standing, and the NS standards expressly exempt publicly owned entities from the requirement. The amounts and duration are co-ordinated with progress, takeover and the defects liability period, and the handling of claims follows the contractual formalities. Direct agreements may supplement the security package in financed projects.

The contracts allocate insurance obligations for construction/works insurance, liability insurance, and project and operational risk. Alignment between contractual liability and insurance coverage is expected, but care should always be taken to verify that the insurer does not impose limitations that reduce coverage beyond what the contract provides for.

Contractor’s Insurance

Under NS 8405 and NS 8407, the contractor shall keep materials and works insured until takeover, with the employer as co-insured. In larger projects, the employer frequently takes out a CAR/EAR (contractor’s all risks/erection all risks) policy under which the contractor is co-insured.

Employer’s Insurance and Workers’ Compensation

In addition, the employer is required to take out occupational injury insurance for its own personnel pursuant to the requirements of the Working Environment Act. Insurance typically covers physical damage (fire, theft, natural perils) and third-party liability.

Professional Indemnity Insurance

The professional liability of design professionals is insured separately; see further in 2.5 The Designer.

Both parties have the right to terminate in the event of the other party’s insolvency. The employer’s right is excluded where performance will continue or satisfactory security is furnished. The insolvency estate retains a statutory right of assumption under the Satisfaction of Claims Act. The security mechanisms of the standard contracts (guarantees, retention) mitigate the performance risk.

Target price and partnering models share cost and gain deviations in defined percentages to incentivise joint optimisation. There is no Norwegian standard for partnering contracts, but contract proposals developed by the Enterprise Federation of Norway (EBA) are used in practice; see 1.2 Standard Contracts. Simpler target price mechanisms with bonus/malus are more prevalent than full-scale alliance agreements.

Each party shall appoint a representative with authority to act bindingly. The contractor may not replace key personnel without the employer’s consent, which may not be withheld without justifiable cause. The contracts also impose HSE compliance requirements.

The contractor must normally notify the employer or obtain the employer’s consent to the engagement or replacement of subcontractors, and remains fully liable for the subcontractors’ performance vis-à-vis the employer. Where reasonable grounds exist, the employer is entitled to refuse approval of a proposed subcontractor, provided that written notice of refusal is given promptly and in any event within 14 days of receiving the relevant particulars concerning the subcontractor.

In tender processes, the employer frequently requires tenderers to name key subcontractors in the tender and may limit the number of subcontractors, resulting in a pre-approved list of suppliers. The contractual chain must handle deadlines, notification and variation rules consistently in order to avoid gaps in chains of claims.

The employer is granted a right of use of design material for the completion, operation, maintenance and modification of the works, while the design professional normally retains the copyright to its own ideas and material.

In the event of a breach of contract, the parties have recourse to the classical remedies: rectification, price reduction, damages and termination in the event of material breach. The employer may also withhold payment within the agreed framework.

Notification as a Prerequisite

A prerequisite for pursuing remedies is that timely notification is given within the contractual deadlines (often “without undue delay” or “within a reasonable time”). Failure to comply with the notification periods will normally result in forfeiture of the claim. The contractor’s remedies in the event of default by the employer include, inter alia:

• suspension of the works;
• extension of time;
• price adjustment;
• interest on late payment; and
• termination in the event of material breach.

Other Breaches and Professional Liability

For breaches other than delay or defects, the aggrieved party may as a starting point claim damages for documented loss in accordance with general principles of contract law. For design professionals, professional negligence applies, with rectification and damages within the framework of the contract.

The standard contracts limit remedies by excluding indirect losses, capping liquidated damages, and requiring timely notification as a prerequisite for claims. Courts will uphold agreed limitations unless the loss is attributable to wilful misconduct or gross negligence.

The NS contracts operate on a sole remedy basis for delay and defects; additional damages may only be claimed in cases of wilful misconduct or gross negligence. Termination may be invoked in the event of material breach.

Indirect losses are frequently excluded. Claims for damages primarily cover direct costs, while indirect losses are reserved for cases of wilful misconduct or gross negligence. The offshore standards typically contain mutual indemnities for indirect losses.

The right to withhold payment is recognised in Norwegian background law and is also reflected in the standard contracts. The employer may, at its own risk, withhold sufficient payment to secure a legitimate specified counterclaim against the contractor.

Contractor’s Right to Suspend

The contractor has a right to suspend the works in the event of material payment default under NS 8405 and NS 8407. Suspension requires written advance notice with a 24-hour deadline for the employer to pay, and a justified suspension entitles the contractor to time and cost compensation. An unjustified suspension may give rise to liability for damages.

Employer’s Right to Suspend

The employer’s right to suspend the works is not provided for in NS 8405 or NS 8407. Employers that require the ability to suspend the works should therefore include an express suspension clause in the contract. The offshore standards contain a suspension clause under which the contractor is entitled to additional payment and an extension of time and may terminate the affected part of the contract if the works are not resumed within 120 days.

Termination may be effected in the event of material breach following notification and a deadline for rectification, and results in the release of both parties from future contractual obligations. The contractor is entitled to compensation for works performed.

Consequences of Termination

Where the employer rightfully terminates, the employer is entitled to recovery of necessary additional costs and foreseeable loss resulting from the termination. Where the contractor rightfully terminates, the contractor is entitled to recovery of additional costs, including demobilisation and winding-up costs, as well as lost profit on the part of the works not carried out.

Cancellation by the Employer

The employer further has the right to cancel all or part of the works. Under NS 8405, NS 8406 and NS 8407, the contractor is in such cases entitled to compensation for its loss resulting from the cancellation.

The ordinary courts have jurisdiction unless otherwise agreed. The Dispute Act governs the procedure, and the court structure comprises the District Court, the Court of Appeal and the Supreme Court. The venue is, as a starting point, the judicial district in which the construction or civil engineering works are carried out, unless otherwise agreed. Under NS 8405/8415, disputes involving amounts in excess of approximately NOK13 million (as of 2026) shall be resolved by arbitration, in which case the Arbitration Act governs the procedure.

The Eight-Month Time Limit

Under NS 8405/8415, NS 8407/8417 and NS 8408/8418, a practically critical time limit of eight months from takeover applies for commencing legal proceedings; failure to comply may result in forfeiture of the contractor’s or subcontractor’s claim. The takeover date for the subcontract and the main contract normally coincides, so that the eight-month time limit also coincides, which may create significant risk for the main contractor if an unexpected subcontractor claim is brought close to the deadline. This must be managed contractually in the subcontract chain.

Limitation Periods

The limitation periods under the Limitation Act also apply; see 3.11 Defects and Defects Liability Period.

Under the standard contracts, disputes should first be attempted to be resolved amicably. Court-facilitated mediation, conducted by a sitting judge once pleadings have been exchanged, in practice represents the single most effective mechanism for resolving construction disputes in Norway, with a substantial proportion of cases reaching settlement at this stage. Out-of-court mediation with party-appointed mediators is also frequently used.

Project-Integrated Mediation and Expert Determination

NS 8407 and NS 8408 provide for project-integrated mediation (PRIME), under which a mediation panel assists the parties in resolving disputes on a continuing basis during the contract period. The standards also provide for expert determination, in which an independent expert renders an advisory decision that becomes binding if both parties accept it within one month. Even where the decision has not become binding, it shall in many cases nevertheless be complied with until it is set aside by agreement or by a court or arbitral tribunal. The mechanism provides a rapid means of resolving disputed claims during the project.

Arbitration

Norwegian arbitration law follows the UNCITRAL Model Law framework. An arbitral award is final and binding, there is no right of appeal on the merits, and a challenge on procedural grounds (invalidity action) faces a stringent threshold. Both NOMA and the OCC administer institutional arbitration proceedings, with fast-track procedures and mediation services also available.

The offshore standards provide, as a general rule, for ad hoc arbitration, whereas onshore contracts normally follow court proceedings unless arbitration has been agreed. Arbitration is the default for disputes under NS 8405/8415 exceeding approximately NOK13 million (as of 2026).