What is the Breyne Law and why does it concern you?
The Breyne Law — named after the Belgian senator Frank Breyne, who initiated it — is the Act of 9 July 1971 regulating the construction of dwellings and the sale of dwellings to be built or under construction; the consolidated full text is published in the Belgian Official Gazette (JustEL). It is a matter of public order, meaning that no contractual clause may derogate from it.
Its purpose is simple: to protect buyers of new-build homes against potential abuses by property developers or turnkey contractors. Before 1971, many buyers ended up with abandoned construction sites, runaway prices, or payment instalments demanded before the work was actually carried out. The Breyne Law has locked all of that down.
Concretely, it imposes four key obligations on the builder:
- Conclude a written contract with mandatory clauses (fixed price, schedule, plans)
- Comply with maximum payment instalments at each construction stage
- Provide a financial completion guarantee covering finishing works in case of default
- Block 5% of the price as a security deposit until final reception
If you buy an apartment off-plan, commission a turnkey home, or sign a VEFA contract for a property still in shell stage, this law applies to you. To dig deeper, see our detailed explanation of the Breyne Law and the annotated full text.
Scope: when does the Breyne Law apply?
Three cumulative conditions determine whether your situation falls under the law:
Condition 1 — It must be a dwelling. The law protects the acquisition of a home intended as a primary or secondary residence. Purely professional buildings (warehouses, standalone offices, commercial spaces) are excluded. A mixed-use house may be covered if the residential portion is predominant.
Condition 2 — The home is new or under construction. Concretely:
- A house built by a turnkey contractor on your land
- An apartment bought off-plan or during the works (VEFA)
- A heavy renovation (shell entirely rebuilt) on an existing building
Standard renovations (interior, finishing, insulation) are not concerned — unless they involve substantial reconstruction. Our cluster Breyne Law and renovation details the borderline cases.
Condition 3 — Payment is staggered. If you pay in full upon delivery (rare but possible), the Breyne Law does not apply. It specifically targets situations where the buyer pays in several instalments as the works progress — that is, virtually all new-build purchases in Belgium.
Some cases fall outside the scope: public procurement, purchases by real-estate professionals for resale, buildings 100% completed at the time of signing. See our detailed cluster Scope and exceptions and the dedicated page on exceptions.
The 5% security deposit — the developer’s financial guarantee
This is arguably the best-known mechanism of the Breyne Law, and the one that protects your wallet most directly.
Principle. The developer or contractor must constitute a guarantee equal to 5% of the sale price (excluding VAT), blocked at the notary or with an approved financial institution — a mechanism whose practical buyer-side terms are recalled by the Royal Federation of Belgian Notaries (Notaire.be). This amount remains unavailable until final reception — that is, about one year after provisional reception. If reservations are raised during this year and not lifted, the buyer can draw on the deposit to have the works completed by a third party.
Worked example. You buy a turnkey house at €480,000 excl. VAT. The security deposit represents €24,000 that remain blocked. If, at the end of the warranty year, the contractor has not repaired a recurring leak you reported, you may unlock all or part of the €24,000 to call in another professional.
The blocking, gradual release (50% at provisional reception, 50% at final according to part of the legal doctrine) and seizure cases are detailed in our pivot cluster Breyne Law security deposit, with a dedicated page on the exact calculation and another on the release procedure.
Regulated payment instalments (Article 7)
Article 7 of the Breyne Law sets maximum thresholds for payments at each major construction stage. The idea: that the buyer never pays more than the actual value of the work already performed.
For a typical turnkey home, the usual thresholds are (indicative; case law refines on a case-by-case basis):
| Stage | Cumulative payment cap |
|---|---|
| Contract signature | 5% max (reservation deposit) |
| Foundations completed | 20% max |
| Watertight (roof) | 50% max |
| Wind-tight (windows fitted) | 75% max |
| Completion (before reception) | 90% max |
| Balance at provisional reception | 100% (with statutory 5% retention) |
Any overrun gives you the right to refuse the instalment. Keep evidence of progress (dated photos, site minutes). To go further, see Article 7 explained, Detailed payment instalments and Down payments during construction.
“The Act of 9 July 1971 aims to protect the buyer against any payment disproportionate to the actual state of progress of the works.”
Cass., 16 Sept. 2016
The mandatory completion guarantee
What happens if your developer goes into administration mid-build? Without the Breyne Law, you would lose your payments and your future home. With it, you are protected.
Article 12 requires the builder, before signing the authentic deed, to provide a completion guarantee covering the takeover of works by another contractor in case of default. Two forms are accepted:
- Joint and several guarantee from a banking institution or a recognised insurance company. The third party undertakes to pay the difference required to finish the works.
- 100% security deposit of the remaining price due, blocked with a financial institution or notary. This form is more costly for the developer but more reassuring for the buyer.
Always verify that the completion guarantee certificate is delivered to you before signing the deed. If the contractor claims they will “deal with it later,” that is a red flag — a contract without a guarantee is void.
Note that the completion guarantee is distinct from the ten-year liability (which covers structural defects after reception) and the two-year warranty. The Construction warranties pillar covers all post-reception protections, and our Completion guarantee cluster digs into this specific mechanism.
Turnkey contract vs. VEFA sale — what are the differences?
Both regimes are covered by the Breyne Law, but they differ fundamentally on a legal level.
| Aspect | Turnkey | VEFA |
|---|---|---|
| Contract type | Works contract | Sale contract |
| Who owns the land? | The buyer | The developer (transferred with the property) |
| Who chooses the materials? | The buyer (within the specifications) | The developer (fixed specifications) |
| When does one become owner? | From the start (of the land) | Gradually, as works progress |
| Applicable VAT | 6% or 21% depending on situation | Always 21% except in specific cases |
In practice: turnkey is mostly used for single-family houses, VEFA for apartments in collective buildings. Breyne Law obligations (security deposit, instalments, completion guarantee) apply in both cases, but reception terms differ slightly.
To go deeper:
- The turnkey contract under the Breyne Law — all mandatory clauses
- VEFA in Belgium — specifics of off-plan sales
- The Breyne Law sales contract — mandatory clauses
- Our Buying new-build in Belgium pillar — broader buyer’s guide
Developer obligations, buyer rights
On the developer’s side, the Breyne Law imposes five major obligations:
- Pre-contractual information: before signing, the developer must hand over a detailed technical brief, plans, specifications and the status of permits.
- Fixed price: the price must be firm (apart from strictly framed revision clauses — see Price revision cluster).
- Precise schedule: completion deadlines with late penalties if missed.
- Financial guarantees: 5% security deposit + completion guarantee (covered above).
- Permit compliance: the delivered property must exactly match the building permit granted.
See our detailed cluster Developer obligations.
On the buyer’s side, you benefit symmetrically from:
- The right to a detailed and readable contract (no trap clauses)
- The right to refuse payments exceeding statutory thresholds
- The right to a property compliant with the specifications and plans
- The right to provisional and final reception within deadlines
- The right to post-reception warranties (ten-year, two-year, perfect completion)
The Buyer rights cluster compiles these rights with the applicable case law.
Sanctions in case of non-compliance
What does a developer who fails to comply with the Breyne Law actually risk? And what can you do?
The most powerful sanction: contract nullity. Article 13 provides that any contract which does not respect the mandatory clauses, or which is not accompanied by the required guarantees, is null and void by operation of law — a public-order nullity confirmed by case law and the FPS Justice, which oversees the application of this consumer-protection law. This nullity can be raised by the buyer, even years later. Consequence: payments must be refunded.
Other possible sanctions:
- Damages: if you have suffered harm (delay, defects, loss of use), the court may award compensation.
- Contractual late penalties: if the contract provides for them (and most must), they accumulate day by day.
- Forced execution: the court may order completion at the developer’s expense or appoint another contractor.
Practical approach in case of dispute:
- Formal notice by registered letter with acknowledgement of receipt. See Formal notice to contractor cluster for a template.
- Mediation or prior conciliation (sometimes mandatory under the contract).
- Judicial action before the competent business court. See Recourse against the developer and Breyne Law sanctions.
Key articles and recent case law
Three Breyne Law articles come up most often in practice:
- Article 7 — Maximum payment instalments (see our Article 7 cluster)
- Article 9 — Provisional and final reception; mandatory one-year period (see Article 9)
- Article 12 — Guarantees (5% security deposit + completion guarantee)
Recent case law (selection):
- Cass., 14 Sept. 2017 — Provisional reception cannot be implicit; it requires a written act, dated and signed by both parties.
- Cass., 16 Sept. 2016 — The developer cannot require payment higher than the actual state of progress.
- Mons, 22 March 2019 — Contract nullity for lack of a completion guarantee is imprescriptible as long as final reception has not taken place.
To dig deeper, see our Breyne Law summary, the annotated full text and the Breyne Law case-law monitoring.