May 1, 2024

Energy Renovations – Property Sales: New Energy Audit Rules


Image 1Image 1 credit: Alekss –

An energy audit provides detailed information about a home's energy and environmental performance. This document is particularly useful for prospective property buyers to:

To obtain information on issues related to the environment and the energy transition in the building sector; To be provided with at least two construction proposals (including an itinerary of one or more stages) that will let you know what to do first to improve the energy performance of the home you have purchased;

It is the selling owner's responsibility to appoint a professional (such as a trained registered architect, or certified environmental professional) to carry out an energy audit prior to the sale. The document can then be handed over to the potential buyer on their first visit, or at the latest on the day the sales contract is signed.


From 1 April 2023, if you are putting your own detached or apartment building up for sale, you must provide a prospective buyer with an energy audit if your home (or part of your home) has been rated F or G (thermal sieve) on an energy performance audit. This obligation extends to the following cases:

From 1 January 2025 it will apply to homes classified as E, and from 1 January 2034 to homes classified as D.

please note

An energy audit can be beneficial if:

How is energy auditing progressing?

From 1 April 2024 onwards, traders carrying out energy audits may, at the request of the selling owner, propose alternative work scenarios in addition to the two mandatory proposals. Furthermore, each work proposal must specify:

The characteristics and performance criteria of any proposed materials or equipment (such as the heat resistance of the insulation and the efficiency and seasonal efficiency of the heating system) and, if necessary, the type of insulation and the amount of insulation to be installed recommended by the contractor performing the energy audit.

Also, from 1 April onwards, each proposed work must be a means of achieving a satisfactory level of thermal comfort, i.e. maintaining a constant temperature in the dwelling (18-20°C) whatever the season. If the audit shows that the air exchange in the dwelling is insufficient or uncontrollable, it must be shown from the very start of the work path that the ventilation system needs to be modified.

Moreover, in the first proposal made by a trader, the first stage of the working path will necessarily be:

Allows you to improve your energy performance diagnostics by at least 2 levels compared to the previous level of 1. Includes work on 2 insulation stations (roof, walls, floors, etc.).

please note

The final stage of the work pathway in the first scenario must enable the achievement of a performance level equal to or greater than level B of the Energy Performance Diagnostic. If this level cannot be reached due to technical, architectural, heritage or disproportionate costs of the works, an upgraded work pathway must be provided, which must enable the achievement of at least levels C, D or E for buildings classified as E, F or G respectively before the works. This pathway includes the survey of six workstations.

Wall insulation, lower floor insulation, roof insulation, exterior carpentry replacement, ventilation system replacement, heating and domestic hot water system replacement.

The experts carrying out the energy audit must present the best available know-how adapted to the characteristics of the building.


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