If you are thinking of replacing your windows or improving the insulation in your home, the start of 2026 could be the ideal time. There are subsidies available to improve the energy efficiency of homes, covering part of the cost of replacing windows, insulating walls or upgrading air conditioning systems. At Immosegur, we explain how they work and what steps to take to make the most of them.
The aim of this aid is to promote more sustainable housing, reducing energy consumption and increasing thermal comfort. Replacing old windows with better insulated models or reinforcing the building's envelope can lead to significant savings in heating and air conditioning, as well as increasing the value of the property.
Subsidies can reach up to €6,000 per home, covering around 40% of the total cost of the work. This includes expenses such as installation, energy certificates, licences and technical work. To be eligible, you must prove that the property is your main residence and that the work will result in a measurable energy improvement, such as a reduction in heating demand or greater primary energy savings.
The application process begins with planning: requesting several quotes, obtaining the preliminary energy certificate and preparing the basic documentation (identification, title deed or rental agreement, registration, technical project and licences). Once the documents have been gathered, the application can be submitted online or in person.
Once the grant has been awarded, you have up to 12 months to carry out the work and justify the expenses with invoices and a new energy certificate. Only then will the payment of the grant be processed.
Although the application period runs until mid-2026, it is advisable not to wait: funds are limited and are allocated on a first-come, first-served basis. If you are considering improving the insulation or replacing the windows in your home, this is a perfect opportunity to do so with significant financial support. With good planning, you can enjoy a more efficient, comfortable and sustainable home for a long time to come.