What Is the Decennial Guarantee in Belgium? Article 1792 & 2270: Who Must Insure, Limits and Penalties

The decennial guarantee is Belgium’s cornerstone liability regime for construction defects that threaten the solidity, stability or structural integrity of a building. Rooted in Articles 1792 and 2270 of the Belgian Civil Code, it holds contractors, architects and other construction professionals personally liable for serious defects for a period of ten years after the works are accepted. For project owners the regime offers a powerful safety net; for those who build, design or advise, it creates an obligation that must be understood, insured against and managed from the first day on site.

Since the introduction of mandatory decennial civil liability insurance legislation in 2018, the stakes of non-compliance have risen sharply, making this one of the most consequential areas of insurances in Belgium construction. This guide explains the statutory framework, identifies who must insure and at what limits, maps the most common coverage exclusions, and sets out the practical consequences when things go wrong.

Legal Framework: Articles 1792 and 2270 Explained

Belgium’s decennial guarantee regime draws its force from two provisions of the Civil Code that have operated in tandem for over a century. Together, Article 1792 and Article 2270 of the Belgian Civil Code create a near-strict liability standard for construction professionals involved in works that go on to suffer serious structural defects. Understanding each provision, and the way they interact, is the essential first step for any contractor, architect or broker managing risk on a Belgian project.

Article 1792, Plain-Language Summary and Implications

Article 1792 of the Belgian Civil Code establishes the liability of architects and contractors when a building or major work perishes, wholly or in part, due to a defect in construction or even a defect in the ground. The provision applies to defects that compromise the solidity or stability of the structure, not cosmetic issues or minor finishing problems. In practice, Belgian courts have consistently interpreted Article 1792 to cover defects that affect the essential structural elements of a building, including load-bearing walls, foundations, roofing structures and waterproofing systems that are integral to structural integrity.

The ten-year liability period under Article 1792 begins to run from the date of acceptance (reception) of the works, typically the provisional reception (réception provisoire) unless the parties have contractually agreed otherwise. During this window, the building owner can bring a claim directly against the architect, contractor or both without needing to prove fault beyond the existence of the defect itself. This creates what industry observers characterise as a quasi-strict liability standard: once a qualifying defect is established, the burden shifts heavily onto the construction professional to demonstrate an exemption.

Article 2270, How It Interacts With Article 1792

Article 2270 complements Article 1792 by imposing a ten-year prescription period on claims relating to the builders’ ten‑year liability. Where Article 1792 defines the substantive liability, Article 2270 sets the procedural boundary: any legal action must be initiated within ten years from the acceptance of the works. After this period expires, the right to claim is extinguished regardless of when the defect became visible.

Crucially, Article 2270 applies to both architects and contractors. It cannot be shortened or waived by private agreement, it is a matter of Belgian public policy. The interaction between the two articles means that a project owner has the full ten-year window to discover and litigate serious structural defects, while the construction professional remains exposed throughout that same period.

Timeline and Key Dates

The following table summarises the critical milestones that determine when the decennial guarantee begins, when it ends and how the prescription period operates in practice.

Who Is Liable and Who Must Insure Under the Decennial Guarantee?

One of the most frequent questions from practitioners concerns exactly which parties carry decennial liability exposure and, consequently, which parties are required, or at least strongly expected, to hold ten-year liability insurance. The answer depends on the nature of the work performed and the role occupied on the project.

Builders, Architects and Intellectual Professions, Role-by-Role Obligations

Under Article 1792 of the Belgian Civil Code, the two categories of professional most directly exposed are architects and contractors. Belgian law requires an architect’s involvement in any construction project requiring a building permit, and that architect bears decennial liability for design decisions that contribute to serious structural defects.

Since the Law of 31 May 2017 (entering into force on 1 July 2018), architects have been subject to a mandatory decennial insurance obligation for their ten-year liability relating to residential buildings. Contractors and other service providers in the construction sector performing work on the closed shell (gros œuvre fermé) of residential buildings are equally subject to this mandatory insurance requirement. The legislation was extended by the Law of 9 May 2019 to cover all service providers in the construction sector, including stability engineers and other intellectual professions, whose work can affect the solidity or stability of the structure.

For non-residential projects, decennial insurance is not always a statutory requirement, but it remains near-universal market practice. Clients, lenders and project financiers routinely demand certificates of decennial civil liability insurance as a condition of contract. The practical effect is that architect liability in Belgium, and contractor liability alike, almost always needs to be backed by a dedicated ten-year policy.

Developers, Project Owners and Transferability of Rights

Developers and project owners are not themselves liable under Articles 1792 and 2270 for construction defects, but they are the primary beneficiaries of the decennial guarantee. When a developer sells a completed property, the buyer steps into the original owner’s rights and can bring a decennial claim against the architect or contractor directly. This transferability, which operates automatically under Belgian law without needing an express assignment clause, is one of the reasons the regime provides such robust protection to end purchasers.

Project owners and developers should, however, pay close attention to their contractual arrangements. If a developer has agreed to take on certain construction risks, or if warranty provisions in the sale agreement blur the line between contractual and statutory remedies, exposure can arise indirectly. Owner’s interest insurance is increasingly used to bridge this gap.

When Liability Is Shared or Apportioned

Belgian courts routinely encounter claims where both the architect and the contractor bear responsibility for a single defect, for example, where a design specification was flawed and the builder failed to flag the issue during execution. In such cases, the court will apportion liability between the parties, often on a percentage basis informed by expert reports. The building owner is not required to determine the split before bringing a claim; they can sue all parties jointly and leave the allocation to the court.

This joint-and-several exposure underscores why every participant in the construction chain needs independent decennial cover. A contractor who relies on the architect’s insurance, or vice versa, takes on significant risk if the other party’s policy is inadequate, expired or subject to an exclusion that leaves the claim uninsured.

Mandatory vs Recommended Insurance: What to Buy

Understanding what is the decennial guarantee in practical insurance terms means distinguishing between the various policy types available on the Belgian market. Not all construction-related insurance is created equal, and procurement errors are among the most common compliance failures.

Decennial Civil Liability Insurance, Scope, Limits and Typical Sum Insured

A decennial civil liability insurance policy is specifically designed to respond to claims arising from defects covered by Articles 1792 and 2270 of the Belgian Civil Code. It covers the cost of repairing or rebuilding structural elements that fail due to a serious defect within the ten-year period. According to market guidance published by leading Belgian brokers, a standard policy typically covers the reconstruction value of the closed shell of the building, with minimum sums insured often starting at €500,000 for residential projects.

For larger commercial or infrastructure projects, sums insured are negotiated on a project-by-project basis and can run into the tens of millions of euros. The policy is usually project-specific, meaning it attaches to the individual construction project rather than acting as a blanket annual policy. Cover commences at the date of provisional reception and runs for exactly ten years. The premium is paid as a single upfront amount at the start of the cover period.

Professional Indemnity vs Decennial, Overlap and Gap Chart

Confusion between professional indemnity (PI) insurance and decennial insurance is widespread. While both respond to professional errors in construction, their triggers, durations and coverage scopes differ significantly. The table below maps the key distinctions.

Industry observers expect that the gap between these two products will narrow as Belgian insurers develop combined offerings, but for now, practitioners should treat them as complementary, not interchangeable.

Practical Procurement Tips for Brokers and Contract Clauses

When procuring insurances in Belgium construction projects, the following practices reduce the risk of coverage gaps:

• Require certificates before works begin. Do not accept a promise to insure, demand a certificate of insurance naming the project and confirming the decennial cover period.
• Check that subcontractors are endorsed. If subcontractors perform structural work, confirm they are either named on the contractor’s policy or hold their own decennial cover.
• Align policy inception with the anticipated provisional reception date. A policy that starts too early or too late can create dangerous gaps in cover.
• Include a waiver of subrogation clause in favour of the project owner to prevent the insurer from recovering against another insured party on the same project.

Coverage Limits, Exclusions and Common Policy Wordings

Even with a decennial civil liability insurance policy in place, significant risks can fall outside the scope of cover. Understanding common exclusions is as important as understanding what is insured.

Typical policy exclusions encountered on the Belgian market include:

• Normal wear and tear. Deterioration caused by the natural ageing of materials or ordinary use is universally excluded.
• Maintenance failures. Defects arising from the owner’s failure to maintain the property in accordance with reasonable standards (e.g. neglected drainage, blocked gutters leading to water ingress).
• Aesthetic and cosmetic defects. Cracking, discolouration or surface imperfections that do not affect structural solidity fall outside the decennial scope.
• Defects known at reception. If a defect was visible and documented during the provisional reception but accepted by the owner, it is generally excluded from the ten-year cover.
• Works outside the closed shell. Interior finishing, painting, tiling and landscaping, unless they form part of a waterproofing or structural system, are typically not covered.
• Force majeure and exceptional events. Earthquake, flood, war and similar events are addressed by separate policy types (e.g. natural catastrophe cover) rather than the decennial policy.

When reviewing a decennial policy wording, the following checklist helps ensure adequate protection:

• Confirm the policy explicitly references Articles 1792 and 2270 or equivalent statutory language.
• Verify that the sum insured matches or exceeds the reconstruction value of the closed shell.
• Check the definition of “serious defect”, ensure it aligns with Belgian case law on solidity and stability.
• Review the claims notification requirements (typically written notice within a specified number of days of discovery).
• Confirm coverage for latent defects, defects that are hidden at reception and only manifest later within the ten-year period.

Penalties, Enforcement and Consequences of Non-Compliance

A critical question for practitioners is what happens when decennial insurance is mandatory in Belgium and a contractor or architect fails to obtain it. The consequences operate on multiple levels.

At the statutory level, the Laws of 31 May 2017 and 9 May 2019 introduced administrative penalties for construction professionals who fail to take out the required decennial insurance for residential buildings. The legislation empowers the competent authority to impose fines and to prohibit the commencement of works until valid insurance is in place. The building owner, notary or project supervisor may refuse to proceed with the provisional reception if no insurance certificate can be produced.

At the civil level, the exposure is even more significant. Because decennial liability under Articles 1792 and 2270 exists independently of insurance, a construction professional who has no policy in place remains personally and fully liable for the cost of repairing or rebuilding defective structural works. For contractors and architects operating as individuals or small firms, this can mean personal bankruptcy in the event of a major structural failure. Belgian courts have consistently held that the absence of insurance does not reduce or extinguish the underlying statutory obligation.

At the contractual level, failure to maintain decennial insurance typically constitutes a material breach of the construction contract. Standard Belgian construction agreements, including those based on model contracts recommended by professional bodies, require the contractor and architect to provide evidence of cover before works commence. A breach of this obligation can trigger liquidated damages, contract termination and claims for consequential loss.

The likely practical effect of these overlapping enforcement mechanisms is that no serious construction professional in Belgium can afford to operate without adequate decennial cover. For project owners and developers, the lesson is equally clear: verify insurance before signing a contract, not after a defect appears.

Claims Process and Practical Steps After a Defect Is Discovered

When a serious structural defect is discovered within the ten-year period, a methodical response is essential to preserve the building owner’s rights and maximise the chances of a successful insurance recovery.

• Within 7 days of discovery: Document the defect with photographs, measurements and written descriptions. Secure the affected area to prevent further damage or risk to occupants.
• Within 30 days: Notify the contractor, architect and insurer in writing. Belgian policies typically require prompt written notice; late notification can jeopardise cover. Send notifications by registered letter or equivalent tracked method.
• Within 60 days: Appoint an independent expert (often a structural engineer) to assess the defect, determine its cause and estimate the cost of repair. The expert’s report will be central to both the insurance claim and any potential litigation.
• Within 90 days: Engage legal counsel if the contractor or insurer disputes the claim. Initiate formal pre-litigation procedures (e.g. a mise en demeure) and consider requesting the appointment of a judicial expert if agreement cannot be reached.

Throughout the process, preserve all evidence, including original construction documents, site diaries, reception reports and correspondence. Belgian courts place significant weight on contemporaneous documentation when adjudicating decennial liability claims.

Contract Drafting and Risk Allocation Checklist for Belgian Projects

Effective risk management begins at the contract stage. The following ten-point checklist is designed for project owners, developers and their legal advisors when drafting or reviewing Belgian construction agreements that involve the decennial guarantee.

1. Require production of a valid decennial civil liability insurance certificate before any works commence on site.
2. Specify that the policy must cover the full reconstruction value of the closed shell and name the project explicitly.
3. Oblige the contractor to ensure all subcontractors performing structural work are either named on the policy or hold their own decennial cover.
4. Include a clause requiring the contractor to maintain the policy for the full ten-year period and to notify the owner immediately of any cancellation, lapse or material change.
5. Incorporate a waiver of subrogation in favour of the project owner and other named insureds.
6. Define the notice period for defect claims (align with the policy’s notification requirements).
7. Retain the right to withhold final payment or retention sums until a satisfactory insurance certificate is produced for the post-reception period.
8. Specify the minimum acceptable sum insured, with a mechanism for adjustment if the project scope changes during construction.
9. Clarify that the decennial obligation applies in addition to, not instead of, any professional indemnity cover the architect or engineer is required to hold.
10. Include a dispute resolution clause that addresses the appointment of experts and the procedure for resolving insurance-related disagreements.

What Is the Decennial Guarantee? Quick-Reference Summary Table

Conclusion

Understanding what is the decennial guarantee, and how Articles 1792 and 2270 of the Belgian Civil Code translate into insurance obligations, coverage limits and enforcement risks, is non-negotiable for anyone involved in Belgian construction. Whether you are a contractor pricing a residential project, an architect reviewing your professional obligations, or a developer safeguarding a portfolio investment, the ten-year liability framework demands proactive compliance at every stage. Verify insurance before contracts are signed, ensure coverage matches the reconstruction value of the closed shell, and document every defect the moment it is discovered. For project-specific guidance or to discuss your decennial insurance arrangements with a qualified Belgium construction lawyer, consult the Global Law Experts lawyer directory.

For a comparative perspective on how decennial liability operates in other jurisdictions, see our guide to decennial liability in France.

Sources

1. FOD Economie, Decennial Civil Liability (FPS Economy)
2. Howden Belgium, Decennial Liability
3. Eubelius, New Insurance Obligations for Intellectual Professions
4. HDI Global, Factsheet (BE)
5. Van Dessel, Ten-Year Liability Insurance
6. France Assureurs, How Decennial Liability Insurance Works (PDF)
7. Inco Insurance, Decennial Liability Service Page