Support by region
| Region | Support for windows |
|---|---|
| Wallonia | No window grant since 30 September 2026. Funding possible through Rénopack or Rénoprêt within a project that improves the energy label. |
| Brussels | Renolution grants suspended: no grant for 2025 or 2026 invoices. |
| Flanders | Mijn VerbouwPremie “ramen en deuren” for income categories 3 and 4 only. |
In Flanders, the window grant covers up to 50% of the invoice excluding VAT for category 4 and 35% for category 3, up to a ceiling. It requires high-efficiency glazing and ventilation conditions, and can only be claimed once every five years for the same home.
Regional schemes are explained in our guide Renovation support in Belgium.
6% VAT, across Belgium
For a home at least 10 years old used mainly as a private dwelling, window replacement can be invoiced at 6% VAT instead of 21%. The contractor must invoice the end customer directly and state the reduced rate on the invoice.
Which performance to aim for
- Uw: the whole window (frame and glazing). The lower, the better it insulates.
- Ug: the glazing alone.
For its former grant, Wallonia required a Uw of 1.5 W/m²K or less and a Ug of 1.1 W/m²K or less. These remain useful benchmarks. If you have a recent audit or energy certificate, follow its recommendations.
PVC, aluminium or wood?
- PVC: good value and little maintenance.
- Aluminium: slim frames and large glazed areas; choose thermally broken profiles.
- Wood: warm look that suits older façades, but needs regular maintenance.
Don’t forget ventilation
New windows make a home much more airtight. Without enough fresh air, damp and condensation appear. Plan trickle vents or a suitable system; in Flanders, this is a condition of the grant.
Questions to ask before signing
- What are the Uw and Ug values of the windows offered?
- Double or triple glazing, and which spacer?
- Are fitting, removal of old frames and finishing included?
- Does the quote apply 6% VAT?
- What guarantees cover the products and the installation?
- Is planning permission needed (change to the façade, listed building)? Check with the local council.
For windows, doors or gates, see also our introduction to Ouvertis.
Key points
- Wallonia and Brussels: no standalone window grant in 2026.
- Flanders: grant for income categories 3 and 4, with ventilation conditions.
- 6% VAT for homes at least 10 years old, across Belgium.
Sources
This guide provides general information, up to date on the date shown. It does not replace advice from a notary, a lawyer or the relevant authority. Immo4Now is an information website, not an estate agency.