New-build house builder in Belgium: how to choose well

The new-build house builder you choose will determine three decisive parameters: the technical quality of your home for the next 30 years, the deadline compliance (and hence your transitional rental budget), and above all your financial security in case of provider difficulty. A fragile limited company that goes bankrupt at 70% progress means putting €60,000 to €150,000 on the table to restart with another stakeholder — when the Breyne Law does not fully play its role. This guide reviews the concrete criteria to choose a reliable builder in 2026 and avoid major disappointments.

Builder solidity: financial criteria to verify

First check, before any price negotiation: builder solidity. A company that seems to offer the best price may be an empty shell, and 30% of Belgian construction disputes in 2024 involved a bankruptcy or judicial reorganisation of the contractor during the site.

Minimum checks:

• Valid CBE number (Crossroads Bank for Enterprises) accessible at kbopub.economie.fgov.be. Check registration date: caution if less than 3 years seniority on a residential construction programme.
• Paid-up share capital: minimum €50,000 for a serious builder operating turnkey. A limited company with €1,000 capital asking you for fund calls of €250,000 is a major alarm signal.
• Annual accounts published regularly at the NBB Balance Sheet Office. A company that does not publish or shows negative equity over several exercises must be excluded.
• Bankruptcy history: check the Belgian Official Gazette annexes and specialised press (Trends-Tendances, Le Vif, L’Écho). A director who already led a limited company to bankruptcy and created a new entity 6 months later is to be avoided.
• Registration in the registered contractors’ register (Article 30bis VAT Code): essential to fully benefit from the completion guarantee Breyne Law.

The firm Mon Etat Des Lieux systematically carries out these checks as part of its Breyne Law support before any preliminary agreement signature.

Site reference: visit, talk, verify

Second analysis axis: the site reference. No commercial pitch replaces 20 minutes of discussion with an existing co-owner or owner. Ask your builder for the list of the last 5 to 10 houses delivered within a reasonable radius, and take the time to visit them (at least from outside, ideally with owner consent for inside).

Questions to ask owners:

• Actual execution timeline vs promised timeline (typical acceptable gap: +10 to +20%).
• Quality of finishes at the reception and their behaviour over time (3, 5 years later).
• Number of reservations at the provisional reception minutes and effective lifting timeline.
• After-sales reactivity: quick warranty intervention or recurring defect requiring persistence.
• Actual EPC compliance vs declared EPC.
• Would they recommend the builder without hesitation?

Three negative feedbacks out of five should make you flee. An enthusiastic recommendation from five owners out of five is, conversely, the best quality indicator.

For the Brussels-Wallonia market, some builders have a reputation backed by 100+ sites (Thomas & Piron, Maisons Blavier, Matexi, BPI Real Estate, Cordeel); others are solid local structures; still others are recent entrants to examine cautiously.

Builder warranty: what the contract must include

Third axis: contractual builder warranties. For a project subject to the Breyne Law (sale of dwelling to be built), the contract must fully provide:

• 5% security deposit withheld until final reception (Article 12) — see Breyne Law security deposit.
• Completion guarantee by an approved bank (if non-registered contractor).
• Fund-call calendar strictly aligned with progress (Article 10).
• Two-stage reception: provisional then final one year later (Article 9).
• Firm and final price or strictly framed indexation (Article 7).

On the insurance side mandatory since the Peeters law of 31 May 2017:

• Nominative Peeters ten-year insurance for the site (see construction insurance and ten-year liability).
• Professional liability of the contractor.
• Registration certificate of the contractor (Article 30bis VAT Code).

The absence of any one of these elements must lead to refusing signature until compliance. For official documentation, see the Belgian Justice portal on real property.

Case study: bankruptcy avoided thanks to pre-signature audit

A case followed by the firm in 2024: family about to sign with a builder offering 18% less than competitors, on a 165 m² villa at €285,000 excl. VAT. Attractive commercial argument, announced deadline 12 months. Before signing, in-depth Breyne Law audit:

• CBE: limited company created 14 months prior, capital of €18,600.
• 2024 accounts: negative equity of €42,000.
• Completion guarantee: not requested by the builder.
• 5% security deposit: provided but on own account (not secured).
• Peeters ten-year: 2023 certificate expired, not renewed in 2024.

The family declined. Six months later, the builder was placed in bankruptcy — leaving 11 unfinished sites representing over €2.8M of cumulative loss for buyers. The audit avoided €285,000 of risk.

Pitfalls to avoid in builder choice

• Favouring the lowest bidder without prior financial audit.
• Believing oral promises not confirmed in the contract.
• Signing an “outside Breyne Law” contract: protection cancelled.
• Neglecting the Peeters certificate: no ten-year, no protection.
• Accepting an unblocked deposit on third-party account.
• Underestimating financial solidity: the fragile limited company is risk #1.
• Confusing builder and developer: different contractual regimes and warranties — see property developer and construction architect.

Securing the choice before signing

Choosing the builder is the only irreversible decision of your construction project. A pre-signature audit costing €600 to €1,200 saves you 40 to 200 times that amount in case of trouble. The firm Mon Etat Des Lieux offers its Breyne Law support covering the builder audit, contract analysis and preliminary agreement verification. For the rest of the journey, see provisional reception expert. Request a free quote within 24 hours. Also see new-build construction quote for tariff analysis.