A property does not have to be planning-compliant to be sold in Wallonia, but the seller must disclose its planning situation and any known infraction. The notary records it in the deed, and the buyer then inherits any obligation to regularise or demolish (CoDT, 2026).
Planning compliance and the right to sell are two different things. In Wallonia you can legally sell a property that carries a planning infraction, because the law imposes transparency rather than a clean bill of health. What you cannot do is hide it.
The seller has an information duty. Under the CoDT the planning situation must be disclosed, and the notary sets out in the deed what permits exist, whether the works were carried out lawfully and whether any infraction is known (CoDT, 2026). An unpermitted veranda, a garage converted into a bedroom or an undeclared extension are among the most common problems, and once disclosed they become the buyer’s issue.
That is the counter-intuitive core: the sale transfers the property with its planning history attached. A buyer who purchases a home with an infraction may later be required to regularise it through a retrospective permit, or in the worst case to restore the earlier state, and banks are often reluctant to finance a non-compliant property (fautilunpermis.be, 2026). This depresses both the price and the pool of interested buyers.
For the seller, honesty is also self-protection: concealing a known infraction exposes you to liability for hidden defects and to the sale being challenged. The practical answer is to establish the planning position before listing, so you can either regularise, price it in, or present the file transparently. Easyhome does exactly this at the estimation stage.
At a glance
- Selling is legal even with a planning infraction, disclosure is mandatory
- The CoDT imposes an information duty on the seller
- The notary records the planning situation in the deed
- The buyer inherits any obligation to regularise or demolish
- Banks may refuse to finance a non-compliant property (fautilunpermis.be, 2026)
- Common issues: unpermitted veranda, converted garage, undeclared extension
- Concealing an infraction exposes the seller to liability
- Best practice: clarify the planning position before listing