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Replacing windows in France: grants and formalities

Replacing old windows improves comfort and cuts bills. In 2026, funding has changed: MaPrimeRénov’ no longer supports them as a standalone measure. Here are the options that remain.

MaPrimeRénov’: no grant for windows alone

Since 1 September 2026, replacing windows or French doors is no longer funded by the MaPrimeRénov’ per-item route in mainland France. It can still be funded within a whole-house renovation, where it counts as one of the two required insulation measures, for a home rated E, F or G that improves by at least two energy classes. See our guide MaPrimeRénov’ in 2026.

Other possible support

  • Energy-saving certificates (CEE): energy suppliers may still fund some insulation work; compare offers before signing the quote.
  • 5.5% VAT: for energy-improvement work in a home completed more than two years ago, if the windows meet the performance criteria.
  • Interest-free eco-loan and local grants from your region or municipality.

For most support, the contractor must be RGE-certified.

Which performance to aim for

Two values appear on the technical data sheets:

  • Uw: how well the whole window insulates. The lower, the better.
  • Sw: the share of solar heat passing through the window, useful in winter.

Support generally requires Uw ≤ 1.3 W/m².K and Sw ≥ 0.3, or Uw ≤ 1.7 W/m².K and Sw ≥ 0.36. Ask the installer for these values.

Planning formalities

If the replacement changes the exterior appearance (material, colour, glazing layout), a prior works declaration (déclaration préalable) at the town hall is generally required. In a co-owned building, façade windows are often governed by the building rules: check before ordering.

Questions to ask before signing

  • What are the Uw and Sw values of the windows offered?
  • Is the contractor RGE-certified? Does the quote state 5.5% VAT?
  • Are removal of old windows, fitting and finishing included?
  • Are air inlets planned for ventilation?
  • What guarantees cover the products and the installation?

Ouvertis works in Île-de-France and north-eastern France: see its introduction.

Key points

  • No MaPrimeRénov’ for windows alone since 1 September 2026.
  • Remaining: whole-house renovation, CEE grants, 5.5% VAT, eco-loan and local grants.
  • Check Uw and Sw, and whether a planning declaration is needed.

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.