How Sweden's New Building Regulations (BBR & EKS), Contracts, the 2026 Transition and Consultant Liability

The new building regulations Sweden introduced through Boverket’s BFS 2024 series represent the most comprehensive overhaul of the country’s construction rule-book in decades. The reformed BBR (Boverket’s Building Regulations) and EKS (Boverket’s Design and Construction Regulations) entered into force on 1 July 2025, creating a statutory transition window that closes on 30 June 2026. Additional permit-related changes under the Planning and Building Act took effect on 1 December 2025, expanding permit-exempt building thresholds in Sweden. For contractors, developers, consultants and in-house legal teams, the practical question is not merely what the new technical standards say, it is how to update construction contracts, tender documentation and insurance positions before the window shuts.

Immediate actions, do these now:

• Document the regulatory election. Every active project should have a signed contractual record of whether the parties are proceeding under the prior BBR/EKS or the new byggregler.
• Update tender specifications. All procurements issued after 1 July 2025 should explicitly reference the applicable regulation set and require bidders to confirm compliance.
• Notify insurers. Advise professional indemnity (PI) and contractor’s all-risk (CAR) insurers of the election and any increased design-verification responsibilities.
• Review consultant scope. Consultant agreements must reflect the expanded due care obligations introduced by the EKS changes, including certification and verification deliverables.
• Schedule design verification. Build a milestone for independent technical verification into the project programme before the 1 July 2026 cut-off.

What Changed, New BBR & EKS at a Glance Under the New Building Regulations Sweden

Boverket’s reformed regulations consolidate and modernise the previous BBR framework alongside updated EKS provisions that govern structural design and consultant technical requirements. The new rules affect fire safety, energy performance, accessibility, structural design and, crucially for the construction supply chain, the standard of care expected from designers and consultants.

The prior BBR operated primarily through mandatory provisions supplemented by general recommendations. The reformed structure retains that hierarchy but rewrites substantial portions, particularly around energy requirements (aligning with climate declaration obligations for new buildings), fire-safety classifications and verification procedures. The EKS changes raise the bar for design verification and introduce more prescriptive requirements around documentation that designers must produce and certify at handover.

For practitioners negotiating construction contracts Sweden-wide, the immediate concern is that performance standards written into existing agreements may reference superseded provisions. Industry observers expect that projects which fail to align their contractual compliance standards with the correct regulatory edition will face disputes at final inspection and handover.

Key Legal Dates and Scope

The transition choice runs until 30 June 2026. After 1 July 2026, there is no option to elect the prior rules, the new BBR and EKS editions apply to every project regardless of when procurement commenced.

Transition Rules, Electing Old vs New Rules During the Transition Period 2026

During the statutory transition window, the building proprietor (byggherre) may elect whether a project proceeds under the prior BBR/EKS editions or the new byggregler. This election is not merely administrative, it determines the technical standard against which compliance will be assessed at final inspection and, in turn, the benchmark against which contractor and consultant performance obligations are measured.

The practical effect on permits (bygglov in Sweden) is significant. A project that elects the prior rules may reference the old fire-safety classifications, energy-performance benchmarks and accessibility requirements in its building permit application. A project that opts in to the new rules gains the benefit of any relaxed thresholds (for example, expanded permit-exempt building in Sweden for certain categories) but must satisfy the new, more detailed verification and documentation obligations.

Where the contract is silent on which edition applies, the likely practical effect will be uncertainty. Neither party can point to a definitive contractual baseline, creating fertile ground for disputes about whether additional work ordered to meet one edition or another constitutes a compensable change or was always within scope. Industry observers expect that this regulatory ambiguity will generate claims, particularly where the building proprietor’s election conflicts with assumptions embedded in the contractor’s pricing.

How to Document the Election, Model Clause

Drafting suggestion, seek local counsel before use:

“The Parties acknowledge that the Project shall be designed, constructed and verified in accordance with [Boverket’s Building Regulations (BBR) as in force prior to 1 July 2025 / Boverket’s Building Regulations as reformed by the BFS 2024 series effective 1 July 2025] and [the corresponding edition of EKS]. The Building Proprietor confirms that this election has been [notified to / reflected in the building permit application to] the relevant municipality. Any change to this election shall constitute a Variation under Clause [X] and shall entitle the Contractor to an adjustment of the Contract Sum and the Time for Completion.”

This clause achieves three things: it fixes the regulatory baseline, it ties the election to the permit application (reducing the risk of misalignment with the municipality) and it creates a contractual mechanism for dealing with any subsequent change of election.

Contracting Implications, Procurement, Tender Documents, Elections and Notices

Updating construction contracts for the new building regulations in Sweden requires a systematic review of tender documentation, bid evaluation criteria and subcontract flow-down provisions. The changes are not confined to a single clause, they ripple through specifications, warranties, change-order mechanics, testing obligations and insurance requirements.

Tender Update Checklist

• Regulatory baseline statement. Every tender package should open with an unambiguous statement of which BBR/EKS edition the project will follow, cross-referenced to the building proprietor’s election under the transitional rules.
• Bidder compliance confirmation. Require each bidder to warrant that its design and methodology comply with the stated edition, and to identify any areas where compliance is conditional on assumptions about municipal interpretation.
• Design verification deliverables. Specify the verification documentation the successful bidder must produce at each stage gate, reflecting the more detailed requirements in the reformed EKS.
• Subcontract flow-down. Mandate that the main contractor’s subcontracts contain equivalent regulatory-election and compliance-warranty provisions.
• Programme allowances. Build realistic time allowances for any additional municipal review triggered by the new provisions, particularly where the project involves a first application under the new rules in a municipality that has not yet established its internal processes.

Recommended Procurement Clauses

For teams drafting tender and service agreements, the following clause areas should be reviewed and, where necessary, redlined:

Notice and Documentation Mechanics

The building proprietor is responsible for filing the bygglov application, but the practical burden of assembling compliant documentation usually falls on the design team. Where the new regulations change the documentation required to support a permit application, and the construction law terminology involved may differ between old and new editions, the contract should specify which party bears the cost and programme risk of re-documentation if the municipality requests additional material.

Performance Risk, Change Orders and Compliance Testing

A regulatory change that triggers additional works during a project’s life-cycle raises a core contractual question: who bears the cost and time consequences? Under standard Swedish construction contracts, a change in law after the tender date typically entitles the contractor to a variation. However, the new building regulations Sweden introduced were published and known well before 1 July 2025, and the transition window was flagged by Boverket throughout 2024. Early indications suggest that contractors who priced works after mid-2024 will find it difficult to claim that the new rules constitute an unforeseeable change.

The more likely flashpoint is a change of election during the project, for example, where a building proprietor initially elects the old rules but later decides (or is advised by the municipality) to switch to the new byggregler. This scenario demands a clear change-order protocol.

Scenario Walk-Through

• Design non-conformance discovered at verification. Under the new EKS, the verification stage may reveal that a design prepared to the old edition does not meet the new structural or fire-safety benchmarks. If the contract documents the election clearly, the cost falls on the party that changed the election. If the contract is silent, both parties face uncertainty.
• Municipality requests additional documentation. A municipality unfamiliar with the new-edition requirements may request supplementary material that was not anticipated in the contractor’s programme. The contract should provide a mechanism for notifying the employer, agreeing provisional pricing and extending the time for completion.
• Late regulatory interpretation by Boverket. Boverket may issue guidance clarifying ambiguous provisions after a project has been priced. A well-drafted change-order clause should capture this scenario as a compensable event, provided the contractor acts promptly to notify and mitigate.

Drafting suggestion, change-order trigger clause (seek local counsel):

“If, after the date of this Contract, (a) the Building Proprietor changes the regulatory election under Clause [X]; (b) the relevant municipality imposes requirements that differ materially from those reasonably foreseeable under the elected edition; or (c) Boverket issues binding guidance that alters the interpretation of the elected provisions, the Contractor shall be entitled to a fair and reasonable adjustment of the Contract Sum and the Time for Completion, provided that the Contractor gives written notice within [20] Business Days of becoming aware of the relevant event.”

Consultant Due Care, Professional Liability and EKS Changes

The reformed EKS places heightened emphasis on the designer’s and consultant’s due care obligations throughout the project life-cycle, from initial concept through to handover verification. This is the area of BBR 2026 reform most likely to reshape the allocation of professional liability in Sweden’s construction market.

Under the prior framework, the consultant’s standard of care was measured primarily against the general duty to perform services with reasonable skill and diligence, supplemented by whatever the specific consultancy agreement required. The new EKS adds more granular expectations: designers must produce and certify specified verification documentation, participate in defined review stages and confirm that their deliverables satisfy the new technical benchmarks at each milestone.

The practical consequence for consultant liability Sweden practitioners must address is that the scope of a consultant’s engagement, and, by extension, the boundary of its liability, has expanded. A consultant engaged under a scope of services drafted before 1 July 2025 may now find that the new EKS requires deliverables (verification reports, structural certification documents, fire-safety compliance statements) that were not listed in the original agreement. If the consultant has not priced these deliverables, a dispute over whether they fall within the existing scope or constitute additional services is predictable.

Who Bears Design Verification Risk?

The contractual allocation of design verification risk should be addressed explicitly. Under the new rules, verification is not a passive sign-off, it requires an active review of design outputs against the elected regulatory edition. Industry observers expect that, absent clear contractual language, the default position will be that the party who produced the design bears the verification obligation. However, building proprietors who engage a separate verification consultant should ensure that the scope and limitations of that engagement are tightly defined, including the extent to which the verifier is entitled to rely on information provided by the original designer.

Drafting suggestion, consultant due-care clause (seek local counsel):

“The Consultant shall perform the Services with the skill, care and diligence to be expected of a reasonably competent [architect / structural engineer / fire-safety consultant] experienced in projects of a similar nature, scope and complexity, and in compliance with [the BBR/EKS edition elected under Clause [X]]. The Consultant’s deliverables shall include all verification documentation required by the elected EKS edition at each stage gate identified in the Programme. The Consultant’s aggregate liability under this Agreement shall not exceed [amount / multiple of fee], save that this limitation shall not apply to liability arising from wilful misconduct or gross negligence.”

When using definitions in an agreement, practitioners should ensure that terms such as “Services,” “Deliverables” and “Verification Documentation” are defined with sufficient precision to capture the new EKS requirements without creating an unbounded scope.

Insurance, Indemnities and Claims Management

The new building regulations Sweden introduced have direct implications for professional indemnity (PI) insurance, contractor’s all-risk (CAR) policies and the indemnity structures that underpin construction contracts. The expanded verification and certification obligations under the reformed EKS increase the exposure profile for design professionals, and insurers will want clarity on how that exposure has been allocated contractually.

Practical Insurer Checklist, What to Tell PI and CAR Insurers

• Regulatory election. Inform the insurer which BBR/EKS edition the project will follow and provide a copy of the contractual election clause.
• Scope expansion. Disclose any increase in the consultant’s verification or certification responsibilities beyond the scope assumed at policy inception.
• Limitation of liability. Confirm the contractual cap on the consultant’s liability and whether the cap has been agreed at a level that the insurer considers reasonable relative to the PI limit.
• Subcontractor design. Where subcontractors carry design responsibility, confirm whether subcontractor PI requirements have been updated to reflect the new EKS obligations.
• Extended discovery / run-off. For projects spanning the transition window, consider whether extended discovery periods are needed to capture claims that emerge after the 1 July 2026 cut-off.

Drafting suggestion, insurance clause (seek local counsel):

“The Consultant shall maintain professional indemnity insurance with a reputable insurer on an each-and-every-claim basis in an amount not less than [SEK amount] for the duration of the Services and for a period of [X] years following Final Completion. The Consultant shall notify its insurer of the regulatory election made under Clause [X] and shall provide the Employer with evidence of such notification within [14] days of the date of this Agreement.”

Quick Contract Clause Bank and Redline Checklist for Construction Contracts Sweden

The following model clauses are provided as drafting starting points. Each should be adapted to the specific project, procurement route and risk profile. All clauses are drafting suggestions, seek local counsel before use.

• Regulatory election clause. Fixes the applicable BBR/EKS edition; ties election to the permit application; classifies a change of election as a compensable variation.
• Tender representation. Bidder warrants that its pricing and methodology comply with the stated regulatory edition.
• Compliance warranty. Contractor/consultant warrants that all works and deliverables will comply with the elected edition at the date of handover.
• Change-order protocol. Defines triggering events (election change, municipal requirement, Boverket guidance) and notice/pricing mechanics.
• Consultant due-care standard. Sets the benchmark for reasonable skill and diligence by reference to the elected EKS edition and the consultant’s professional discipline.
• Verification and certification deliverables. Lists the specific documents the designer must produce at each stage gate under the new EKS.
• Testing and handover schedule. Identifies new testing and documentation requirements at practical completion and connects them to the defects liability period.
• Insurance and notification obligation. Specifies minimum PI/CAR limits, requires insurer notification of the regulatory election and mandates evidence of cover.
• Indemnity and limitation of liability. Allocates risk between the parties, caps aggregate liability and carves out wilful misconduct and gross negligence.
• Subcontract flow-down. Requires equivalent regulatory-election, compliance-warranty and insurance provisions in all subcontracts.
• Permit responsibility allocation. Clarifies which party bears the cost and programme risk of re-documentation if the municipality requests additional material under the new permit rules.
• Dispute resolution mechanism. Provides for expedited expert determination of technical compliance disputes arising from ambiguous regulatory interpretation, ahead of arbitration or litigation.

For a detailed glossary of construction law terminology used in these clauses, see the dedicated reference guide. Practitioners seeking to connect with experienced construction lawyers in Sweden can use the directory for jurisdiction-specific searches.

Conclusion

The new building regulations Sweden implemented through the BFS 2024 series demand immediate, practical responses from every party in the construction supply chain. With the transition window closing on 30 June 2026, the time to review contracts, document elections and update insurance positions is now, not at the point of dispute.

Sources

1. Boverket, Swedish National Board of Housing, Building and Planning
2. Boverket, BBR: Mandatory Provisions and General Recommendations
3. DLA Piper, Sweden: Top 5 Significant Legislative Changes (March 2026)
4. Notar, New Building Permit Rules (December 2025)
5. Krav Kompetens, Boverket’s nya byggregler 2025 (BFS 2024 Series)
6. Werks Advokater, Transitional Rules for Sweden’s New Building Regulations
7. IEA, Sweden’s Housing and Building Rules