In Belgium, a property listed at an attractive price in Wallonia can end up costing much more than expected if its energy performance certificate (PEB) shows a label E or F. Since October 2026, the new Walloon support regime for energy renovation specifically targets these poorly rated homes, with upgrade obligations that alter the actual budget of a purchase. Successfully completing a real estate project in Belgium first involves integrating these constraints before signing anything.
PEB Certificate and Renovation Obligation: The True Purchase Cost in Belgium
Since September 1, 2026, the Walloon PEB certificate provides more information on recommended works and their potential impact on energy performance. Previous certificates remain valid until their expiration, but the new ones are significantly more detailed.
In Flanders, the requirement is direct: the buyer of a property rated EPC E or F must achieve at least a D label within six years of the authentic deed. This is a contractual commitment that weighs on the budget from the moment of signing.
In practical terms, the energy label alters the actual price of the property. An apartment rated F in Flanders will require façade insulation, a boiler replacement, and sometimes a change of window frames. These costs add to the purchase price and notary fees. Belgian buyers are increasingly avoiding properties that require such heavy energy renovations.
Before making any offer, it is recommended to read not only the label but also the detailed recommendations of the PEB certificate. They indicate priority works and allow for a real cost estimate, well beyond the listed price. On immo-mondial.be, listings in Belgium generally specify the PEB label, allowing for an initial sorting even before the visit.
Mortgage in Belgium: Borrowing Capacity and Rates in 2026
The number of mortgages has decreased compared to 2025. The rise in interest rates mechanically reduces the purchasing power of buyers, and Belgian households have lost several square meters of living space accessible at the same budget.
This context requires checking one’s borrowing capacity before visiting. We are not talking about a vague online simulation, but a concrete appointment with a broker or a bank to obtain a feasibility certificate. Without this document, some agencies do not even forward offers to sellers.
Personal Contribution and Additional Costs
In Belgium, notary fees and registration duties represent a significant part of the total budget. In Brussels, a reduction scheme on registration duties exists, but its application conditions vary. In Wallonia, the duties differ from those practiced in Flanders.
The personal contribution must at least cover the additional costs, as Belgian banks rarely finance more than the total price of the property. Bank processing fees, remaining balance insurance, and mortgage deed fees further add to the bill.
Real Estate Prices by Region: Wallonia, Brussels, and Flanders
In the first half of 2026, Wallonia remained the cheapest region to buy, while Brussels remained the most expensive. This price differential can create the illusion of a good deal in Wallonia, but the purchase price must be cross-checked with the cost of mandatory energy renovation.
A concrete example: a Walloon house listed at a moderate price with a PEB label G or F will need to reach at least a D label under the new support regime that came into effect on October 1, 2026. The regime provides loans adapted to income, but requires a prior audit. Without this audit, no aid is accessible.
- In Wallonia, the new regime targets G or F rated homes that must achieve the D label, and E rated homes aiming for the C label. A prior energy audit is mandatory to access subsidized loans.
- In Flanders, the renovation obligation towards the minimum D label within six years after the deed applies to properties rated E or F. Non-compliance exposes one to penalties.
- In Brussels, the higher prices are partly offset by the reduction on registration duties, but eligibility conditions should be verified with the notary.
Documents and Sale Compromise: Concrete Traps to Avoid
The sale compromise in Belgium legally binds both parties. Once signed, withdrawal is extremely difficult, contrary to what some buyers imagine when comparing with other countries.
Before signing, several points that sellers do not always highlight should be systematically checked.
- The PEB certificate must be attached to the compromise. If it dates from before September 2026, its recommendations will be less detailed: requesting a new certificate may reveal underestimated works.
- The state of the soil (non-pollution certificate) is required in Flanders and Brussels. In Wallonia, the responses vary on this point depending on the municipalities.
- The subsequent intervention file (DIU) documents the works carried out on the property. Its absence complicates future renovations and may pose problems for resale.
- Easements and urban planning: an urban planning extract allows for checking that the property is compliant and that no infringement is ongoing.
The Belgian notary acts for both parties, buyer and seller. However, one can designate their own notary at no extra cost, providing an independent view on the file. This option remains underutilized by first-time buyers.
Purchase Offer: What You Are Really Committing To
In Belgium, a written and accepted purchase offer already constitutes a sales agreement. There is no legal withdrawal period like in France. Every written offer must be carefully considered, as withdrawal after acceptance exposes one to damages.
The common practice is to include suspensive conditions in the offer, notably the obtaining of the mortgage loan within a specified period. Without this clause, a credit refusal does not release the buyer from their commitment.
The Belgian market rewards prepared buyers. A completed financing file, careful reading of the PEB certificate, and a notary involved from the offer stage help avoid the additional costs that too many buyers discover after signing the compromise.
