In the face of rising energy prices and new regulations, energy renovation has become a must for owners. It not only lowers your bills: it improves comfort of life, enhances your property and participates in the ecological transition.
But concretely, how can we improve the energy performance of your apartment? Here are the most effective solutions.
1. Why undertake an energy renovation?
Reduce your energy bills significantly
A poorly insulated apartment can lose up to 30% heat from walls and 25% from roof. By renovating, you consume less heating and air conditioning, which translates into savings of several hundred EUR a year.
Improve your daily comfort
A well-insulated accommodation keeps the heat in winter and the freshness in summer. No more unpleasant air currents, humidity and temperature variations between rooms.
Valorizing your real estate
Since 2023, apartments classified G or F at the DPE are progressively prohibited from renting. Well-renovated housing is gaining market value and remains attractive for resale.
2. Priority work to improve energy performance
Thermal insulation, the first step
The insulation is the basis of any energy renovation. A well-insulated apartment reduces loss to 60%.
- Interior insulation of walls : accessible and efficient.
- Isolation of ceilings and floors : essential in apartments on the last or first floor.
- Double or triple glazing windows Reduction of heat loss and acoustic comfort.
👉 Investment: between 40 and 120 €/m2 according to technique and materials.
Ventilation for a healthy and efficient air
A leakproof housing shall be well ventilated. Without ventilation, moisture is installed, which degrades indoor air and reduces energy performance.
- Single flow VMC : entry-level, but already improves air circulation.
- Double flow VMC : recovers heat from extracted air to heat incoming air → up to 15% energy savings.
Heating, a key consumption station
Once the insulation is done, it is time to modernize the heating system.
- Heat pump (PAC) Up to 60% savings.
- Condensing boiler : more efficient than a conventional boiler.
- Wood or granulated stove : ecological and economic solution.
👉 Budget: 6,000 to 15,000 € according to the chosen solution.
Hot water, often neglected
Produce hot water consumes a lot of energy. Modern solutions:
- Thermodynamic water heater (savings of 50-70%).
- Solar water heater (ideal if sufficient exposure).
3. Financial aid available in 2025
MaPrimeRenovation
State aid covering part of the insulation, heating and ventilation work. The amount varies according to your income and type of work.
Eco-loan at zero rate (eco-TPZ)
Funding up to 50,000 € Without interest, refundable over 15 to 20 years, ideal for heavy work.
Energy saving certificates (EEC)
Premium financed by energy suppliers, cumulative with other aids.
Local aid
Some regions or municipalities offer additional subsidies to encourage energy renovation of housing.
4. How can energy renewal be efficiently planned?
Make a precise energy diagnosis
The DPE (Energy Performance Diagnostic) or an energy audit is used to target housing weaknesses and prioritize work.
Establish a phased renovation plan
It is not always necessary to do everything at once. We can start with insulation, then change the heating, and finally take care of the ventilation.
Choosing qualified RGE professionals
The label Recognized Environmental Guarantee is compulsory in order to benefit from the aid. It also guarantees work in accordance with standards.
5. How much does an apartment energy renovation cost?
Orders of magnitude
- Insulation: 3,000 to 15,000 € Depending on surface and materials.
- Windows: 500 to 1200 € per window.
- Heating: 6,000 to 15,000 €.
- Breakdown: 2,000 to 6,000 €.
Return on investment
An energy renovation can reduce the annual bill by 30 to 60%. On average, the investment is amortised in 7-12 yearswhile increasing the resale value of the apartment.
✅ Conclusion: a long-term renovation
Energy renewal is not just an expense: it is a sustainable investment. It improves comfort, reduces burdens and enhances your heritage.
👉 Want to improve the energy performance of your apartment? Discover our custom solutions on our dedicated page:
