Sue the Contractor or Claim Insurance? How to Choose for Construction Defects in Belgium

When a Belgian homeowner or developer discovers construction defects, cracked load-bearing walls, subsiding foundations, leaking roofwork, the first practical question is whether to sue the contractor or claim insurance for those Belgium construction defects. The answer turns on the type of defect, the insurance policies in force, the remedies you need, and a set of limitation deadlines that leave little room for indecision. Recent changes in 2024–2026, tighter arbitration windows, Court of Cassation clarifications on extra-contractual liability, and updated insurer handling practices, have made this choice more consequential and more time-sensitive than it was even two years ago.

“Suing” means initiating contractual or extra-contractual proceedings against the contractor (or architect, engineer, or subcontractor) before Belgian courts or an arbitral tribunal, seeking damages, specific performance, or contract termination. “Claiming insurance” means filing a claim under an applicable policy, most commonly the mandatory decennial (ten-year) liability insurance, but also all-risks construction cover, professional civil-liability insurance, or a legal-assistance policy. These two routes are not always mutually exclusive: in many cases you can, and should, pursue both in parallel. But the sequence, the timing of each step, and the tactical implications of choosing one route first differ sharply, and getting it wrong can forfeit rights you cannot recover.

This guide sets out each option, compares them dimension by dimension, and gives a concrete decision framework so you can act immediately. Where the choice is close or the stakes are high, the article identifies the specific triggers that mean you should instruct a construction lawyer before taking any further steps.

Option A: Sue the Contractor, What It Covers and Who It Suits

Suing the contractor is the traditional civil-law route for enforcing contractor liability in Belgium. It encompasses two distinct legal bases, and the one you rely on shapes everything from the evidence you need to the damages you can recover.

Contractual claims arise from breach of the construction contract itself. The contractor undertakes to deliver works that conform to the agreed specifications, comply with building regulations, and are free from defects at handover. When the finished works fall short, defective finishings, non-compliant installations, delayed completion, failure to meet acoustic or thermal standards, the owner sues for breach of contract. Remedies include damages, an order compelling the contractor to redo the work (specific performance), withholding of retained sums, or outright termination of the contract with restitution. Contractual claims cover both visible and hidden defects, although visible defects that were not reserved at provisional or final reception can be deemed accepted.

Extra-contractual (tort) claims rely on Articles 1382–1383 of the former Civil Code (now Articles 6.1 and following of Book 6 of the new Civil Code). They require proof of fault, damage, and a causal link. Extra-contractual claims become relevant when the homeowner wants to reach a party with whom no direct contract exists, for example, a subcontractor engaged by the main contractor, or a materials supplier, or when the defect amounts to a violation of a statutory duty (building standards, safety regulations) rather than a purely contractual shortcoming.

Suing the contractor suits you best when:

• The defect falls outside decennial scope, finishings, delays, non-structural defects, or contractual underperformance that insurance does not cover.
• The insurer has denied or limited cover, you need an alternative route to recovery.
• You need control over the remedy, specific performance, contract termination, or a damages award that exceeds any insurer cap.
• Multiple parties share liability, you want to join the architect, engineer, or subcontractor in one set of proceedings.

Before filing suit, assemble these essentials: the signed construction contract and any addenda; provisional and final reception minutes (with all defect reservations); dated photographs and video of defects; an independent expert report quantifying the defects and estimated repair cost; all invoices and payment records; and written correspondence (letters, emails, text messages) with the contractor about the defects.

Option B: Claim Insurance, Decennial and Other Policies

Belgium’s insurance landscape for construction defects revolves around the decennial guarantee, the cornerstone liability regime for defects that threaten the solidity, stability, or watertightness of a building. Since 1 July 2018, the Peeters Act (Act of 31 May 2017) has made decennial liability insurance mandatory for contractors carrying out work on dwellings in Belgium. A parallel Act (Act of 9 May 2019, sometimes called the Peeters-Borsus Act) extended similar mandatory insurance obligations to architects, engineers, and other “intellectual” construction professionals. The ten-year insurance covers the civil liability of these professionals for a fixed period of 10 years starting from the provisional or final reception of the construction works.

What decennial insurance covers is narrow but powerful: defects that affect the solidity, stability, or watertightness of the closed shell of a dwelling. It does not cover cosmetic defects, finishings, or defects in parts of the building that do not compromise structural integrity. The insurance is taken out by the construction professional, but the building owner is a direct beneficiary, meaning you claim directly against the insurer, not via the contractor.

Beyond decennial cover, several other policies may be relevant:

• All-risks construction insurance (ABR/TRC), covers damage to the works during the construction phase, typically expiring at reception.
• Professional civil-liability insurance, covers the architect’s or engineer’s non-contractual liability to third parties.
• Legal-assistance insurance (rechtsbijstand), covers the owner’s legal fees, expert costs, and court costs for disputes, subject to policy limits and waiting periods.

Claiming insurance suits you best when:

• The defect clearly falls within decennial scope, structural cracking, settlement, roof collapse, compromised load-bearing elements.
• Speed of repair matters more than maximum recovery, an insurer that accepts cover can fund remedial works faster than a court can order them.
• You want to avoid the upfront costs of litigation, no court fees, no lawyer retainer (though policy excesses still apply).

To initiate a claim, take these steps immediately: preserve all evidence (photos, videos, expert notes); send a written notification to the insurer by registered post, describing the defect and enclosing photographs; request appointment of a joint or independent expert; and document every communication and remediation step in writing. Do not begin repairs before the insurer’s expert has inspected the site, unless emergency works are needed to prevent further damage, and document those too.

Sue vs Insurance Claim for Belgium Construction Defects: Side-by-Side Comparison

The table below compares the two routes across the dimensions that matter most to a homeowner or developer making this decision. Use it as a quick reference before reading the detailed analysis in the following section.

Dimension-by-Dimension Analysis: Insurance Claim vs Lawsuit for Construction Defects

Eligibility and Scope

The scope of each route is the single most important factor in choosing between them. Decennial liability insurance, as defined by the FPS Economy, covers the ten-year liability of construction professionals for defects limited to the solidity, stability, and watertightness of the closed shell of a dwelling. If a defect threatens the structural integrity of the building, subsiding foundations, cracking in load-bearing walls, failure of a primary roof structure, it falls squarely within decennial scope and an insurance claim is the natural first step.

• Decennial insurance does not cover: cosmetic defects (paint peeling, minor tile cracks), finishing work (kitchen installation, flooring), delays, or defects in non-residential buildings (unless a separate policy applies).
• Suing the contractor covers: any defect that constitutes a breach of contract, from structural failings to defective finishings, late delivery, or failure to comply with specifications. Extra-contractual claims extend to safety violations and damage caused by subcontractors or suppliers.

The practical rule: if the defect threatens the structure or the building’s solidity, file a decennial insurance claim immediately. If the defect is about fit-for-purpose, aesthetics, finishings, or contractual non-performance, sue the contractor.

Cost and Recoverable Expenses

Cost is usually the second factor owners weigh. The table below sets out the typical cost components for each route. Figures represent common ranges observed in Belgian practice; actual costs vary by region, complexity, and counsel.

The legal costs comparison makes insurance claims attractive when the defect is covered and the excess is manageable. Litigation becomes the better investment when the defect is outside insurance scope or when the potential damages award significantly exceeds what any policy would pay.

Timing and Limitation Periods

Belgian law imposes strict time limits that can extinguish your rights if you do not act promptly. The decennial liability period runs for 10 years from the date of provisional or final reception of the construction works. Within that window, the owner can claim against the construction professional’s decennial insurer for covered defects. Any claim filed after the 10-year period expires is time-barred.

Contractual claims are subject to the general civil prescription rules. Under the Belgian Civil Code, the standard prescription period for personal claims is 10 years, but shorter contractual or conventional limitation periods may apply if the construction contract includes specific clauses. Where an arbitration clause exists, the contractual time limits for initiating arbitral proceedings can be significantly shorter and may be triggered by specific notice requirements.

Recent reforms in 2024–2025 have compressed several procedural deadlines and clarified arbitration windows, making it riskier to wait for an insurer’s decision before acting. The tactical imperative is clear: send written notice to both the insurer and the contractor immediately upon discovering a defect. Do not wait for the insurer’s response before preserving your litigation rights, limitation periods do not pause while an insurance claim is under investigation.

Liability Standard and Burden of Proof

The burden of proof differs materially between the two routes, and this shapes how easy it is to succeed.

• Decennial liability is a public-order (mandatory) liability regime that cannot be contractually excluded or limited. For defects within its scope, those affecting solidity, stability, or watertightness, liability attaches to the responsible construction professional as a matter of law. The owner must prove the defect exists and that it falls within the statutory scope, but does not need to prove traditional “fault” in the same way a tort claim demands.
• Contractual claims require proof that the contractor breached a specific obligation under the construction contract. The owner must demonstrate the defect, its link to the contractor’s works, and the resulting damage.
• Extra-contractual claims require proof of fault, damage, and causation. The 2025 Court of Cassation rulings have clarified the reach of extra-contractual liability in construction, affecting which parties (designers, architects, subcontractors) a homeowner can pursue beyond the main contractor. Industry observers expect these rulings to expand the practical scope of tort-based claims against project participants who were previously shielded by the contractual chain.

The practical takeaway: for structural defects, decennial liability offers a simpler evidentiary path. For non-structural defects or claims against third parties, expect a heavier proof burden and consider whether expert evidence will support your case before committing to litigation.

Enforceability and Remedies

A favourable outcome is only as valuable as your ability to enforce it. The two routes differ in how remedies are delivered and what happens next.

• Suing the contractor can yield a court judgment ordering damages, specific performance (compelling the contractor to redo defective work), contract termination, or interest. Enforcement requires additional steps: garnishment of the contractor’s bank accounts, seizure of assets, or attachment of receivables. If the contractor is insolvent, enforcement becomes difficult regardless of the judgment’s size.
• Claiming insurance delivers remediation funded by the insurer, typically repair or replacement of the defective element, or a cash indemnity up to the policy limit. The insurer’s performance is guaranteed by its own solvency and supervised by the Belgian insurance regulator (FSMA). However, once the insurer pays, it acquires subrogation rights and may pursue the contractor itself to recover its outlay. This can be advantageous (someone else chases the contractor for you) but can also mean you lose direct control over how the contractor is held accountable.

The cross-benefit to consider: insurer-funded repairs may be the fastest route to a habitable building, but if you also want to hold the contractor accountable for consequential losses (temporary accommodation, loss of rental income, delay penalties), you may need to sue separately for those heads of damage that the insurer does not cover.

Insurer Subrogation and Coordination

Subrogation is the mechanism by which an insurer, after paying a claim, steps into the insured’s shoes and pursues the responsible contractor to recover its outlay. Under Belgian insurance law, subrogation is the norm for decennial and civil-liability policies. While subrogation can benefit the owner, the insurer bears the cost and risk of recovery proceedings, it also creates coordination traps that can cost an unwary owner dearly.

• Duty to mitigate: Under Article 76 of the Belgian Insurance Act, an insurer that suffers a disadvantage because the insured failed to prevent or mitigate damage can reduce its payment proportionally. This means that if you discover a defect and fail to take reasonable preservation steps (covering an exposed structure, stopping water ingress), the insurer may cut your payout.
• Parallel claims risk: If you sue the contractor while an insurance claim is pending, the insurer may argue that you are complicating its subrogation rights. Conversely, if you settle with the contractor without the insurer’s consent, the insurer may refuse to pay or seek reimbursement of amounts already paid.
• Lower settlement risk: Insurers sometimes accept lower settlements with contractors to preserve commercial relationships. If the insurer settles for less than your full loss, the shortfall is yours to pursue separately.

The coordination checklist: always preserve evidence; accept repair proposals only with written insurer concurrence; notify both insurer and contractor of the defect in writing by registered post; document every step; and never settle with the contractor without confirming the insurer’s position first.

What Changed in 2024–2026 for Construction Defect Claims in Belgium

Three sets of changes alter the practical calculus for anyone choosing between an insurance claim vs lawsuit for construction defects in Belgium.

Arbitration and time-limit clarifications (2024–2025). Legislative and professional-body guidance compressed several procedural windows for construction disputes. Where an arbitration clause exists in the construction contract, the time limits for initiating proceedings have been clarified and, in some cases, shortened. The practical effect: owners who wait for an insurer to accept or deny a claim before taking action risk missing arbitration deadlines that cannot be extended.

Court of Cassation rulings on extra-contractual liability (2025). Belgium’s highest court issued rulings in 2025 that clarified the extent to which homeowners can bring extra-contractual claims against construction professionals (architects, engineers, subcontractors) outside the direct contractual chain. Early indications suggest these decisions widen the pool of parties a homeowner can sue in tort, which strengthens the litigation route for complex, multi-party defects.

Insurance-practice and policy-wording updates (2026). Insurer handling practices and decennial policy wordings have been updated, reflecting evolving expectations around remediation timelines, subrogation procedures, and the insurer’s duty to act promptly. The likely practical effect will be faster initial claim-handling but stricter enforcement of the insured’s duty to mitigate and to cooperate with the insurer’s appointed expert.

The bottom line: these changes make early lawyer involvement and parallel notification of both insurer and contractor more important than ever. Waiting to see whether the insurer will cover the defect before preserving litigation rights is now a riskier strategy than it was before 2024.

Decision Framework: When to Sue vs When to Claim Insurance

Use the checklists below to identify your best route. In many cases the correct answer is “both”, notify the insurer and preserve litigation rights simultaneously, but the primary route you resource first should follow this framework.

Choose to claim insurance when:

• The defect clearly affects solidity, stability, or watertightness, squarely within decennial guarantee scope.
• The insurer has confirmed cover or the defect is urgent and insurer-funded remediation is the fastest fix.
• You want to minimise upfront legal costs and are willing to accept policy-capped recovery.
• You do not need contractual remedies such as termination or withheld payments.

Choose to sue the contractor when:

• The defect is outside decennial scope, finishings, non-structural defects, delays, or specification breaches.
• The insurer has denied or limited coverage.
• You need contractual remedies: specific performance, contract termination, withheld retention sums, or damages for consequential loss.
• Limitation or arbitration deadlines mean that waiting for the insurer would risk losing your right to sue.
• Multiple parties (architect, engineer, subcontractor) share liability and you want to join them in one proceeding.

Do this now, regardless of which route you choose:

• Preserve all evidence: photographs, videos, written communications, and invoices.
• Send written notification to the insurer by registered post within days of discovering the defect.
• Contact a construction lawyer immediately if limitation or arbitration deadlines may be triggered within the next three to six months.

When to Hire a Construction Lawyer for Belgium Construction Defects

Not every defect requires immediate legal representation, but the following situations do. Engage a construction lawyer without delay if:

• Limitation or arbitration deadlines may expire within three to six months, missing a deadline can permanently bar your claim.
• The insurer denies or limits coverage, you need to assess whether to challenge the denial or pivot to litigation.
• Estimated repair costs substantially exceed the insurer’s policy excess, the financial stakes justify professional advice on the best recovery route.
• Multiple parties share liability, coordinating claims against a contractor, architect, engineer, and subcontractor requires strategic legal management.
• You need to draft or respond to formal notices, preservation letters, insurer notifications, or contractor demand letters that protect your rights must be precisely worded.

Even where none of these triggers applies, a short initial consultation, typically one to two hours, can confirm whether your defect falls within decennial scope, identify the correct policy, and map the limitation deadlines you face. That early investment often saves far more than it costs.

Sources

1. FPS Economy, Decennial civil liability insurance
2. Global Law Experts, What Is the Decennial Guarantee
3. Monard Law, Insurance for civil liability in the construction sector
4. Eubelius, Insurance in the construction sector: new insurance obligations for intellectual professions
5. Lydian, Overview 2022 Supreme Court case law on the Insurance Act
6. Howden Belgium, Decennial Liability Insurance
7. Van Dessel, Peeters-Borsus Act: mandatory liability insurance
8. Norton Rose Fulbright, Too costly to ignore: Managing defect claims in construction projects