Roof 30%, facades 20%, windows 10%, floors 10%: where energy really escapes and where to start.
A common myth about windows
It is often assumed that replacing windows is the first step to reducing energy loss. Yet these losses come from several sources, and windows are not the biggest.
How heat loss is distributed
Based on the orders of magnitude we use to advise our clients, heat mainly escapes through:
- The roof: about 30%
- Facade walls: about 20%
- Windows: about 10%
- Floors: about 10%
Where to start?
Most of the energy escapes through the facade and the roof, so these are the first things to maintain or renovate. Walls renovated with modern materials, proper insulation and ventilation can noticeably improve energy efficiency.
In the best case, you could save up to 40% on your energy bill (gas or electricity for heating).
Beyond the bill: value and durability
By investing in effective insulation you add tangible value to your property, reflected in a sale thanks to the EPC certificate.
Fixing infiltration or drainage problems early also avoids water damage, mould and costlier structural problems later.
Take stock of your home
Every home is different. A free, no-obligation technical visit identifies the priorities in your case and gives you a precise, detailed and transparent quote.