Not improving the DPE of a home could cost you thousands of euros when you sell it

An unfavorable energy performance rating (EPR) has also become a criterion for lowering the price of a property. How can you improve your energy performance rating? What are the priority works to be carried out to move from a class E, F, or G to D? ROCKWOOL, the world leader in rock wool insulation, provides its recommendations for improving the energy performance of a property for sale.

A poor DPE, a strong argument for lowering the price

In this tense context, the DPE (energy performance diagnosis) becomes a key factor. An indicator now mandatory for any sale or rental, it reflects the energy consumption of a home. Increasingly attentive to their future energy bill, buyers penalize the most energy-intensive properties. On average, a house classified F or G sells for 180.000 euros less than a house classified A or B. For apartments, the discount is between 237 and 660 euros per square meter depending on the case[2].

What work should be carried out as a priority to improve the energy performance of a property?

Improving your energy performance certificate (EPC) primarily involves better insulation. Up to 80% of heat loss is due to uninsulated walls. Before installing a new heating or ventilation system, it's essential to address the building's thermal envelope. Properly installed insulation can quickly improve your energy performance certificate (EPC) rating. Once this step is complete, you should reinforce the sealing of your woodwork and opt for efficient heating, sized according to your new needs.

As part of MaPrimeRénov' Parcours Accompagné, the main public support scheme for energy renovation, a preliminary energy audit helps define the work to be undertaken and anticipate performance gains, particularly in terms of the number of DPE classes.

[1] Bien'ici Study - 2025

[2] Itaque thermal design office – 2025

Illustrative image of the article via Depositphotos.com.