Housing audit in Wallonia: what it is for

What the audit contains

According to energie.wallonie.be, the housing audit gives an opinion on the energy quality of an existing home and on certain criteria of healthiness, health and safety. It applies to houses, flats and blocks of flats.

The auditor analyses:

• the walls and envelope (walls, roof, floors, window frames);
• heating and domestic hot water;
• ventilation;
• stability and damp.

The auditor takes your plans into account, for example converting unheated spaces. The works are then grouped into “packages” (bouquets). Each scenario is costed: initial investment, payback period and energy savings. You receive a report, together with an explanatory brochure with photos and diagrams.

There are four types of audit, depending on the home:

• type 1: a house or flat with its own heating (envelope and installations);
• type 2: a flat in a building with a collective boiler room (envelope only);
• type 3: a building where each flat has its own heating (envelope only, “incomplete” audit);
• type 4: a building with collective heating (envelope and installations, “complete” audit).

Housing audit and EPB certificate: what is the difference?

The EPB certificate is compulsory when a residential property is sold or let. The audit, on the other hand, is a “voluntary measure”, energie.wallonie.be specifies. It complements the certificate, which does not give precise recommendations for works. To understand the certificate itself, read our guide on the EPB certificate.

In short: the EPB certificate tells you where the home stands. The audit tells you which works to carry out, in what order, and what they can bring in.

The link with home grants

This is the main reason to have an audit. Under the grant scheme that started on 14 February 2025, energie.wallonie.be states that:

• most works must appear in the recommendations of the audit report to qualify for a grant (prime);
• the report must be signed and registered before the works begin;
• there is one exception: roof works (roofing, roof structure, rainwater recovery) and roof or attic insulation do not require a prior visit by the auditor.

Other conditions apply to the works. For example, electrical and gas installations must be compliant, and the contractor must be registered with the Crossroads Bank for Enterprises (Banque-Carrefour des Entreprises). For all the support available, read our guide on renovation grants.

The grant for the audit itself

The audit qualifies for its own grant. The basic amount is €76, multiplied by a coefficient that depends on your income category:

Associations of co-owners receive the basic amount only. The audit grant application must be sent within eight months of registration of the report.

The 30 September 2026 deadline

This scheme is presented as temporary (2025-2026). The official page states that all grant applications (audit and works, final invoice included) had to be sent by 30 September 2026 at the latest, and that the works had to be finished by that date. The page does not say what replaces it. Before ordering an audit in October 2026, check on energie.wallonie.be, or by calling the free number 1718, which scheme applies to your project.

The same site also notes that Wallonia can help finance works according to the home’s EPB label (G, F or E), through a 0% or preferential-rate loan from the SWCS (the Walloon social credit company) or the Fonds du Logement wallon (the Walloon Housing Fund).

Which professional to consult

The audit is carried out by a housing auditor approved by Wallonia. To compare quotes for works or financing arrangements, a renovation adviser (the energy desk, guichet énergie, in your area) or a credit broker can help you. An architect or a contractor can turn the recommendations into a building project.