Decennial Liability and Construction Insurance in France, What Developers, Investors and Contractors Must Change in 2026

The rules governing decennial liability in France have not changed in substance, but the environment around them has shifted dramatically. The 2026 Finance Bill introduces cadastral revaluations that alter property tax baselines, the biens immobiliers declaration deadline of 30 June 2026 creates a new reporting obligation for every property owner, and stricter judicial standards are raising the bar for defect determinations. Together, these developments force developers, institutional investors, contractors and their insurers to revisit construction contracts, audit insurance cover and recalibrate financial models, all before mid‑year closings and project handovers. This guide provides the checklists, sample clauses and due‑diligence playbook required to act now.

TL;DR, Nine Immediate Actions for 2026

Before reading the full analysis, use this checklist to prioritise the tasks that cannot wait.

1. Confirm biens immobiliers reporting. Every property owner, individual, corporate or SPV, must file property‑use and occupancy details by 30 June 2026. Late or inaccurate filings attract penalties.
2. Run a portfolio insurance audit. Verify that every building within its ten‑year construction warranty in France has a current assurance décennale policy and a corresponding dommage‑ouvrage policy.
3. Review construction contracts for tax and reporting covenants. Contracts signed before the Finance Bill may lack representations on cadastral values and biens immobiliers compliance.
4. Evidence decennial cover. Demand insurer confirmation letters, not just policy schedules, for every lot and every contractor on active or recently completed projects.
5. Update financial models. Cadastral revaluations change taxe foncière baselines; recalculate total liability value (TLV) scenarios and cash‑flow projections accordingly.
6. Require insurer confirmation letters before closing. Make confirmed cover a condition precedent in every acquisition or forward‑purchase agreement.
7. Adjust indemnity caps and recourse clauses. Ensure indemnity wording accounts for potential tax adjustments arising from revaluations.
8. Confirm manufacturer guarantees. For projects using off‑site fabrication or imported components, check that manufacturer warranties flow down through the contract chain.
9. Schedule remedial budgets. Factor in the cost of engaging specialist surveyors and legal advisers for any claim likely to fall within the decennial period.

Each of these items is explored in detail below, with sample contract language and document checklists.

Understanding Decennial Liability in France, The Legal Framework

Statutory Basis: Articles 1792 to 1792‑6 of the Civil Code

Decennial liability in France, known formally as responsabilité décennale, is a strict, statutory regime established by Articles 1792 through 1792‑6 of the French Civil Code. Under Article 1792, any builder (constructeur) is liable, without proof of fault, for damage that compromises the structural integrity of a building or renders it unfit for its intended purpose, provided the damage manifests within ten years from the date of acceptance (réception des travaux).

Article 1792‑2 extends this regime to defects in equipment elements that are inseparable from the structural works (foundations, load‑bearing walls, roofing frameworks). Article 1792‑3 creates a separate two‑year guarantee of proper functioning (garantie de bon fonctionnement) for dissociable equipment. Article 1792‑6 defines acceptance and the one‑year guarantee of completion (garantie de parfait achèvement), which requires the contractor to remedy all defects noted during acceptance or reported within the following year.

What Constitutes Decennial Damage vs Ordinary Defects

Not every defect triggers the decennial guarantee in France. The test is functional: does the defect compromise structural solidity, or does it make the building unsuitable for its intended use? Cosmetic issues, minor finishing defects and wear from normal use fall outside the decennial scope. The distinction matters because it determines which insurance regime applies and which limitation period governs the claim.

Who Must Take Out Assurance Décennale

French law mandates that every professional involved in construction, architects, general contractors, structural engineers, specialist subcontractors, must hold a decennial liability insurance policy (assurance décennale). The building owner (maître d’ouvrage) is separately required to take out a dommage‑ouvrage policy, which pre‑finances repair costs and then allows the insurer to subrogate against the responsible party’s decennial insurer. Failure to carry the required construction insurance in France exposes professionals to personal liability and potential criminal sanctions.

What Changed in 2026 and Why It Matters to Decennial Liability in France

The 2026 Finance Bill, Tax Changes That Affect Deal Economics

The 2026 Finance Bill (Loi de finances pour 2026) introduced several measures that ripple into construction‑risk management. While the decennial regime itself was not amended, the fiscal landscape around property ownership and development has shifted in ways that affect contractual exposures. Industry observers expect the practical effect to include higher assessed property values for tax purposes, tighter reporting obligations and, consequently, greater scrutiny of asset‑level documentation, including insurance evidence, by both tax authorities and transaction counterparties.

Key Finance Bill provisions relevant to construction contracts include adjustments to the taxe foncière calculation methodology following cadastral revaluations, refinements to the VAT regime applicable to development projects, and the continued rollout of mandatory e‑invoicing for B2B transactions, which tightens the documentary trail for construction services.

Cadastral Revaluations, Impact on Asset Values and Tax Exposure

Cadastral values in France have historically lagged behind market values, creating a disconnect between tax baselines and economic reality. The revaluation exercise initiated under recent legislation is now producing revised values that, in many cases, materially increase the taxe foncière payable on developed properties. For developers, this changes the economics of hold‑versus‑sell decisions. For investors, it alters projected returns and may trigger renegotiation of rent‑review clauses or service‑charge recoveries.

Early indications suggest that the revaluations also create indirect pressure on decennial risk management: higher assessed values mean that the financial consequences of structural defects, and the corresponding insurance claims, carry greater weight in portfolio valuations.

Biens Immobiliers Declaration, Deadline 30 June 2026

The déclaration des biens immobiliers, administered by the Direction générale des Finances publiques (DGFiP), requires every property owner to declare the use and occupancy status of each property by 30 June 2026. The declaration must specify whether the property is occupied as a primary residence, secondary residence, or is vacant, and identify the occupants. Non‑compliance or late filing attracts a fixed penalty per property unit.

For developers with unsold inventory and investors holding multi‑asset portfolios, the reporting obligation is operationally demanding. It requires accurate asset registers that reconcile with cadastral records, and, critically, with the insurance schedules maintained for decennial and dommage‑ouvrage purposes.

Practical Impact, Who Must Act and When

Developers and Sponsors

Developers must impose updated closing conditions on contractors and insurers. Construction contracts in France signed or amended in 2026 should include express representations on biens immobiliers compliance, tax‑reporting cooperation covenants and enhanced insurance‑evidence obligations. Forward‑purchase agreements should make confirmed decennial cover a condition precedent to the buyer’s obligation to complete.

Investors and Asset Managers

Portfolio holders face a dual obligation: file accurate biens immobiliers declarations and verify that every asset within its decennial period carries valid, adequate insurance. Developer due diligence in France now extends beyond title and planning checks to include a tax‑reporting audit and a reconciliation of cadastral values against insured values.

Contractors and Builders

Contractors must provide evidence of decennial cover not only for their own works but, through flow‑down mechanisms, for every subcontractor and specialist trade engaged on the project. Manufacturer guarantees for prefabricated or imported components should be assigned or novated to the building owner to ensure continuity of recourse.

Insurers and Brokers

Industry observers expect insurers to face increased demand for binding confirmation letters and bespoke policy endorsements reflecting the revalued cadastral environment. Brokers should prepare updated policy‑wording templates that address the evolving tax and reporting landscape.

Developer Due Diligence in France, Pre‑Closing and Portfolio Audit Checklist

A rigorous pre‑closing audit is the single most effective way to prevent liability surprises. The checklist below organises the process into four workstreams.

Title and Construction Documents

• Building permits (permis de construire). Confirm validity, any modifications, and compliance certificates (attestation de conformité).
• Acceptance minutes (procès‑verbal de réception). Verify the date of acceptance, it starts the ten‑year decennial clock, and review any reserves noted.
• Completion certificates (déclaration d’achèvement des travaux). Cross‑reference against cadastral records and the biens immobiliers declaration.

Insurance Evidence

• Policy schedule. Full list of insured parties, lots and activities covered.
• Policy wording. Review insured perils, exclusions, retroactive dates, territorial scope and aggregate limits.
• Retroactive date check. The retroactive date must match or pre‑date the project start; any gap creates uninsured exposure for pre‑existing defects.
• Subrogation clause. Confirm the dommage‑ouvrage insurer’s right to subrogate against the decennial insurer.
• Endorsements. Check for any mid‑term endorsements that restrict cover or increase deductibles.

Contractual Review

• Parties and scope. Ensure every lot and structural element is assigned to an identified contractor with confirmed decennial cover.
• Liability caps. Assess whether caps are adequate given revalued asset values.
• Assignment and novation language. Verify that insurance benefits and manufacturer warranties transfer on sale.
• Tax representation covenants. Confirm seller/developer representations on biens immobiliers compliance, cadastral accuracy and VAT status.

Financial Modelling

• Recalibrated TLV scenarios. Model the impact of revised cadastral values on taxe foncière, projected returns and exit valuations.
• Remedial cost budgets. Allocate reserves for potential decennial claims, expert surveys and legal costs.

Construction Contracts in France, Clauses to Update for 2026

Key Clauses to Review and Redraft

The convergence of tax changes and tighter decennial enforcement means that standard contract templates used in prior years may no longer be adequate. Four categories of clause deserve particular attention.

• Decennial liability clause. Specify which party bears primary liability for each lot and structural element. Include express subcontractor flow‑downs requiring each subcontractor to maintain its own assurance décennale and to produce evidence of cover before commencing works.
• Insurance obligations clause. Go beyond the standard obligation to “maintain adequate insurance.” Require the production of insurer confirmation letters at defined intervals (contract signing, commencement of works, acceptance, and annually thereafter). Specify the consequences of failure, including suspension of payment and the right to take out cover at the defaulting party’s expense.
• Tax and reporting covenants. Include seller/developer representations that the biens immobiliers declaration has been filed accurately, that cadastral values used in the transaction reflect the latest revaluation, and that VAT and e‑invoicing obligations have been met.
• Indemnities and recourse wording. Carve out tax adjustments arising from cadastral revaluations as an indemnifiable loss. Where appropriate, include an express waiver of certain procedural defences to streamline recourse between parties in the construction chain.

Sample Clauses

Clause A, Evidence of decennial insurance:

“The Contractor shall, no later than [10] business days before commencement of the Works, deliver to the Developer (i) a certificate of assurance décennale issued by the Contractor’s insurer confirming cover for the Works, (ii) the policy schedule identifying the retroactive date, insured perils, exclusions and per‑claim and aggregate limits, and (iii) equivalent certificates for each subcontractor. Failure to deliver shall entitle the Developer to suspend all payments and, at the Contractor’s cost, to procure replacement cover.”

Clause B, Tax and reporting warranty:

“The Seller warrants that (a) it has filed, or will file by no later than 30 June 2026, an accurate déclaration des biens immobiliers in respect of each Property, (b) the cadastral values relied upon in this Agreement reflect the latest revaluation notified by the DGFiP, and (c) all VAT and e‑invoicing obligations arising from the transaction have been or will be met in full. The Seller shall indemnify the Buyer against any tax, penalty or cost arising from a breach of this warranty.”

Clause C, Manufacturer guarantee flow‑down:

“The Contractor shall procure that each manufacturer of prefabricated components or specialist materials incorporated into the Works issues a written guarantee in favour of the Developer (or its assignees) covering defects in materials and workmanship for a period of no less than [10] years from acceptance. Such guarantees shall be assignable without the manufacturer’s consent.”

Construction Insurance in France, Checklist and Common Policy Gaps

Types of Cover to Check

• Assurance décennale. Mandatory for all construction professionals. Covers structural defects for ten years from acceptance.
• Dommage‑ouvrage. Mandatory for the building owner. Pre‑finances repairs without requiring proof of fault, enabling rapid remediation.
• Professional indemnity (RC professionnelle). Covers design errors, advisory negligence and other professional faults, distinct from, and complementary to, decennial cover.
• Construction all‑risks (tous risques chantier). Covers physical damage to the works during construction; terminates at acceptance.

Policy Wording Checklist

• Retroactive date. Must match or pre‑date the commencement of works on site.
• Territoriality. Policy must explicitly cover works carried out in metropolitan France (and overseas territories, if applicable).
• Insured perils. Confirm coverage for all categories of decennial damage, including equipment inseparable from the structure.
• Exclusions. Watch for blanket exclusions on defective materials, asbestos‑related claims or subsidence.
• Subrogation rights. The dommage‑ouvrage insurer’s subrogation path must be unimpeded.
• Limits per claim and aggregate. Reassess adequacy against revalued cadastral baselines.

Insurer Confirmation Letter, Must‑Include Items

• Full name and registration number of the insured party
• Policy number, inception date and retroactive date
• Description of insured works (by lot and address)
• Per‑claim and aggregate limits of indemnity
• Confirmation that the policy is in force and premiums paid to date
• Statement that the insurer will notify the beneficiary of any cancellation, lapse or material amendment

Dispute and Claims Handling, What to Expect

Timeline and Procedure

A decennial claim must be brought within the ten‑year period running from the date of acceptance recorded in the procès‑verbal de réception. Once damage is discovered, the owner should immediately notify the dommage‑ouvrage insurer, which is required to appoint an expert and make a pre‑financing offer within a defined statutory timetable. The dommage‑ouvrage insurer then exercises its subrogation rights against the contractor’s decennial insurer.

Industry commentary from leading construction‑law practitioners indicates that recent case law has tightened the standards for what constitutes a defect rendering a building unfit for purpose. The likely practical effect is that parties should document the condition of works at acceptance with greater rigour, photographic surveys, independent expert reports and detailed reserve schedules, to support or defend future claims.

Quick Tips for Claims Readiness

• Preserve evidence. Commission an independent survey at acceptance and retain all site records.
• Notify insurers immediately. Delayed notification can prejudice cover or subrogation rights.
• Engage specialist surveyors. Use court‑accredited experts (experts judiciaires) to maximise evidentiary weight.

Reporting Obligations by Entity Type, Comparison Table

Conclusion, Three Steps to Take Before 30 June 2026

The intersection of France’s decennial liability regime with the 2026 fiscal and reporting changes creates a compressed action window for every stakeholder in the construction chain. First, audit insurance coverage across all assets and projects within their ten‑year warranty period, verify retroactive dates, limits and subrogation mechanisms. Second, update construction contracts to include the tax‑reporting covenants, insurance‑evidence conditions and manufacturer guarantee flow‑downs illustrated in this guide. Third, file accurate biens immobiliers declarations by 30 June 2026, reconciling asset registers with revalued cadastral data. Addressing decennial liability in France is no longer a standalone construction‑law exercise; it is now inseparable from tax compliance and transaction structuring. Acting before mid‑year is not optional, it is a matter of contractual and fiscal prudence.

Sources

1. Legifrance, Civil Code (Article 1792 et seq.)
2. DGFiP, Biens immobiliers declaration guidance
3. France Assureurs, How decennial liability insurance works
4. Ministry of Economy, 2026 Finance Bill commentary
5. Kennedys, Decennial liability regime analysis
6. DLA Piper, Developer’s liability and insurance overview (France)
7. Cour de cassation, Selected decennial liability decisions