Roofing Work in Belgium: Standards, Regulations and Regional Aid
In Belgium, roofing work is subject to strict standards that vary by region (Wallonia, Brussels-Capital, Flanders). These regulations aim to improve the energy efficiency of buildings and reduce their carbon footprint. In this article, we explain the current standards, the first available ones, and the penalties for non-compliance.
Standards and obligations for roof insulation in Belgium (2025)
Wallonia
Current standard : The maximum permitted U-value for roof insulation is 0.24 W/m²K, which corresponds to approximately 20 cm of mineral wool .
Obligation : All work requiring planning permission must comply with PEB (Energy Performance of Buildings) standards. Failure to comply can result in administrative fines of several thousand euros .
Condition for bonuses : To benefit from the bonuses, the thermal resistance (R value) of the insulation must be greater than or equal to 4.5 m²K/W .
Brussels
Current standard : The maximum permitted U-value is 0.3 W/m²K, or approximately 15 cm of mineral wool or 12 cm of polyurethane foam .
Obligation : Work subject to planning permission must comply with PEB regulations. Renovations without a permit do not impose any strict obligation, but good insulation is strongly recommended .
Condition for bonuses : To obtain a bonus, the thermal resistance must reach at least 4 m²K/W .
Energy target : All housing must achieve a minimum PEB label C by 2050. Automatic penalties exist for non-compliance, based on surface area and energy performance gap .
Flanders
Current standard : For homes connected before 2006, the minimum R-value is 0.75 m²K/W (3 to 4 cm of insulation). New constructions must meet the “Almost Energy Neutral” (QNE) standards, with a maximum PEB score of E30 .
Obligation : Since 2021, new constructions must meet stricter requirements. Non-compliant housing can no longer be rented out and is considered unsanitary, with severe administrative fines .
Energy target : All housing must achieve energy label A by 2050. Financial penalties are planned for owners who do not meet the deadlines .
Government bonuses and aid (2025)
Wallonia
Amount : The amount of the bonuses depends on the energy performance achieved and the type of insulation used. The amounts were revised downwards at the start of 2025 .
Conditions : Bonus accessible if the R value of the insulation is ≥ 4.5 m²K/W .
Example of bonus : Thermal insulation of roofs and attics, U coefficient ≤ 0.20 W/m²K .
Other assistance : Possible tax reduction for roof insulation work .
Brussels
Amount : From 35 to 75 €/m² for roof insulation (depending on income category) .
Current situation : The RENOLUTION bonus scheme is suspended in 2025 until a new government is formed. 2024 invoices remain eligible under certain conditions, but no applications for 2025 invoices are possible until the situation is clarified .
Other assistance : Reduced VAT rate of 6% for renovation .
Flanders
Amount : €8/m² for work carried out before December 31, 2025, then €4/m² from January 1, 2026 (ceiling at €40/m²) .
Bonus : MijnVerbouwPremie system revised since January 1, 2025, with simplification of procedures .
Other assistance : Reduced VAT rate of 6% for renovation .
Comparative summary of premiums by region (2025)
| Region | Insulation standard (U value) | Prime condition (R value) | Roof insulation bonus amount | Situation 2025 |
|---|---|---|---|---|
| Wallonia | 0.24 W/m²K | ≥ 4.5 m²K/W | Variable, revised downwards | Affordable bonuses, reduced amounts |
| Brussels | 0.3 W/m²K | ≥ 4 m²K/W | 35 to 75 €/m² | Bonuses suspended, awaiting new government |
| Flanders | 0.75 m²K/W (R-value) | ≥ 0.75 m²K/W | 8 €/m² (2025), 4 €/m² (2026) | New My Building Premium scale |
Key takeaways
Roof insulation is mandatory for any renovation or construction requiring a permit, with strict standards depending on the region .
Bonuses are still available in Wallonia and Flanders, but the amount varies and the conditions are stricter in 2025 .
In Brussels, the bonus scheme is suspended in 2025 pending the formation of the new government.
A reduced VAT rate of 6% and tax reductions are possible in all regions for insulation work.
Why respect standards?
Complying with roof insulation standards has several advantages:
- Energy savings : A well-insulated roof significantly reduces heat loss, which lowers your heating bills.
- Legal Compliance : Avoid fines and administrative sanctions by complying with current regulations.
- Real estate value : A house that meets current energy standards is more attractive on the real estate market.
Conclusion
Each Belgian region (Wallonia, Brussels-Capital, Flanders) has its own standards and requirements for roof insulation. Whether you own an existing home or are planning a new build, understanding these regulations is essential to ensure compliance and maximize energy savings. Don't forget to check the first regulations available in your region to finance part of your renovations.
If you have questions about standards specific to your project, consult official resources or hire a certified professional to assist you.