Guide

How to check a Belgian building contractor before works

A quote, a deposit, a site that runs for months: before you commit, ten minutes spent on the contractor's public filings tell you what matters. Here is which ones, and how to read them.

Updated 11 Nov 2026 · 7 min read · Published by Idonis (Vanbe SRL) · About

A building project commits money before the work exists: a deposit on signature, interim payments, sometimes most of the invoice before handover. If the contractor stops halfway, the deposit is rarely recovered and the site stays open. Whether you own a home in Belgium, are renovating after a move, or manage a property from abroad, the contractor's public filings are your first check: in Belgium, a company publishes a lot about itself, and all of it can be searched for free. Here is what to look at, in order, and where to find it.

Register (CBE) identity · start date status · activities Who is it? Annual accounts (NBB) equity · cash profit · filing date Does it hold? Official Gazette directors · office · articles dissolution · court rulings What is new?
Three publications, three questions: who is it, does it hold, what happened recently.

Step by step: where to look, what to read

1

The enterprise number, and what it reveals

Where: Crossroads Bank for Enterprises (CBE), public search

Everything starts from the enterprise number (ten digits, on the quote, the invoice or the website) — the Belgian counterpart of a Companies House, KvK or SIREN number. It leads you to the exact entity in the register. Three checks:

  • Does the name match the quote? A trade name is not a company. The quote must carry the number of the company that will invoice you — not another entity of the same group, nor a sole trader if you thought you were dealing with a BV/SRL (the Belgian private limited company).
  • Since when has it existed? A two-year-old company is not suspicious in itself, but it has no history of accounts yet; you judge it differently.
  • Its legal status. Liquidation, judicial reorganisation, bankruptcy: shown in the register. That is a reason to stop, not to negotiate.

For building work, also look at the registered activities (NACE codes): a company registered for "plastering" that offers you a complete roof will probably subcontract.

2

The annual accounts: three figures to start with

Where: National Bank of Belgium, Central Balance Sheet Office (Consult)

Every Belgian company files annual accounts; SMEs file an abbreviated or micro format, without turnover — that is normal. Three lines tell the essentials:

Item 10/15EquityPositive and growing: the company keeps part of its profits. Negative: it has lost more than its shareholders put in — the law then imposes an alarm procedure.
54/58 vs 42/48Cash ÷ debts due within one yearA building contractor lives on its deposits; if its cash does not cover its short-term debts, your deposit may pay for the previous site.
Item 9904Profit over 3 financial yearsA single loss happens; three losses in a row with shrinking equity is a trajectory.

Finally, look at the filing date. Accounts are filed within seven months of the year-end. A delay of a few weeks is common; accounts missing for more than a year are a signal in themselves.

3

The Belgian Official Gazette: what happened recently

Where: annexes of the Belgian Official Gazette, by enterprise number

Incorporation, change of manager, transfer of the registered office, dissolution, court rulings: everything is published, in French, Dutch or German depending on where the company is based. Before a building project, what deserves attention: a recent office transfer followed by a change of manager, a dissolution or a judicial reorganisation, or publications that stop abruptly for years while the company is still active.

4

Professional qualifications and insurance

Where: ask the contractor

For electrical work, heating, roofing, structural work: ask for the civil liability insurance certificate and, for works on a home that require an architect, the ten-year liability insurance, compulsory in Belgium since 2018. A serious contractor sends them within the hour. It is not financial data, but it is the guarantee that protects you if things go wrong after handover.

Before signing the quote

  • The enterprise number on the quote belongs to an active company in the register.
  • Its equity is positive in the latest filed accounts.
  • Its accounts are up to date (filed less than a year ago).
  • Nothing worrying in the Official Gazette over the last 24 months (dissolution, procedure, frequent change of managers).
  • Liability and ten-year insurance certificates received.
  • Deposit in proportion, balance in stages against a signed progress statement.

Frequently asked questions

A Belgian contractor with no published turnover: is that normal?

Yes. Most Belgian SMEs file an abbreviated or micro format, which does not include turnover. You judge them on equity, cash, headcount and how regularly they file.

What deposit is reasonable for building works?

There is no general legal rule; common practice is 10 to 30% on order. The younger the company or the weaker its accounts, the smaller the deposit should be and the more the payment should be split into stages.

Where can I see a Belgian company's accounts for free?

At the Central Balance Sheet Office of the National Bank of Belgium (the Consult application), by enterprise number. The Crossroads Bank for Enterprises (the company register) and the annexes of the Belgian Official Gazette can also be searched online for free.

What if the contractor has not filed accounts for two years?

Late filing is information in itself. Ask for an explanation, reduce the deposit, or choose a contractor whose accounts are up to date.

With Idonis

The same check, in one question

Type the company's name or enterprise number: Idonis brings the register, the filed accounts and the Gazette publications together on one page, in English, with an explained solidity score and the financial year of every figure. You keep the judgement; you save the ten minutes.

No sign-up. Every Belgian company, from official sources.

Sources of the publications cited: company register (CBE), filed annual accounts (NBB — Central Balance Sheet Office), Belgian Gazette. This guide is general information, not advice for a specific case. How the soundness score is computed

Sector figures

More guides