Energy renovation in Aix-les-Bains.

Housing in Aix-les-Bains is old and energy-hungry. Between the Belle Époque buildings of the spa district, the 1960s-80s co-owned blocks on the hillsides and the detached houses of the residential areas, a large share of the buildings were built before the first thermal regulations. The result: many homes are rated F or G on the DPE — the notorious energy-inefficient homes — with uninsulated walls, unconverted lofts and original single glazing.

The issue is no longer just comfort. Since 2025, homes rated G can no longer be let, and the timetable extends to class F in 2028 and class E in 2034. A landlord in Aix-les-Bains who does not renovate will see their property removed from the rental market. For owner-occupiers, heating bills weigh heavily: the Alpine climate of the Lac du Bourget basin, with its cold, damp winters, extends the heating season and amplifies the heat losses of a poorly insulated home.

Lakeside and hillside buildings add their own constraints: humidity, wind exposure, stone or rammed-earth walls that call for tailored insulation solutions rather than a standard treatment. That is precisely the role of a local project manager: understanding Aix-les-Bains buildings, prioritising the works on the basis of an energy audit and aiming for a genuine jump in DPE class, not an accumulation of one-off measures. Our RGE CertiRénov certification makes the whole project eligible for public funding.

An effective energy renovation tackles the envelope before the heating. Insulation is the first lever: insulating unconverted or converted lofts (the most cost-effective item, often up to 30% of heat losses), internal wall insulation (ITI) when the façade must be preserved, or external wall insulation (ITE), which eliminates thermal bridges and renovates the façade in a single operation. For the specific constraints of external insulation on Aix-les-Bains buildings, see our dedicated guide: external insulation in Aix-les-Bains.

Windows complete the envelope: replacing single glazing with double or even triple low-emissivity glazing eliminates a major cold spot and the draughts common in older town-centre buildings. On the heating side, replacing an oil or gas boiler with an air-to-water or air-to-air heat pump slashes consumption, and a wood or pellet stove provides efficient supplementary heat well suited to the Alpine climate.

Finally, a well-insulated home becomes airtight: air renewal then has to be controlled with mechanical ventilation (VMC), single or dual flow. Dual-flow ventilation recovers heat from the extracted air and limits losses — an advantage in the damp winters of Lac du Bourget. It is the coherent combination of all these items that delivers performance, not adding them one at a time.

Three main schemes fund an energy renovation in Aix-les-Bains. MaPrimeRénov', the state grant, can cover up to 90% of the cost depending on your income and the targeted energy gain, with a bonus for upgrading an energy-inefficient home. Energy Savings Certificates (CEE), paid by energy suppliers, are added as bonuses. The interest-free eco-loan (eco-PTZ) finances up to €50,000 of the remaining cost with no interest. On top of these come local grants from the Grand Lac conurbation.

All these grants share one condition: the works must be carried out by an RGE-certified company. We are one. For details of the 2026 scales, ceilings and procedures, see our complete guide: MaPrimeRénov' 2026 and renovation grants. To understand what our qualification covers and why your grants depend on it, see the page RGE energy renovation. We prepare grant applications as part of our project management service.

You can renovate in stages — replacing the boiler one year, insulating the loft the next — or aim for a whole-house renovation that tackles the envelope and equipment in a single coherent operation. Step by step is less costly to finance in the short term, but it carries a risk: installing a heat pump in an uninsulated house leads to oversizing it, running it too much, and losing part of the benefit. The order of the works matters as much as the works themselves.

This is where our project management approach comes in. We start from an energy audit, draw up a prioritised and costed scenario, and coordinate the trades in the right order to achieve a jump of several DPE classes. You remain the contracting party for each trade: transparent costs, budget control, and a single point of contact to manage the site from audit to handover. It is also the condition for securing the “major renovation” grants, the most advantageous ones.