In a context where environmental issues are becoming increasingly prominent, energy renovation of homes is becoming an essential approach. Beyond the simple desire to reduce energy expenses, it is about contributing to a greener planet and enhancing the comfort level of one’s home. To navigate this complex universe of energy performance, an energy audit is a crucial step. Since April 2023, it has even become mandatory for the sale of homes classified F or G, identified as energy sieves. What are the characteristics of an energy audit? Why is it a necessary step before considering potential improvement works? Let’s explore this essential topic together.
What is an energy audit and why is it essential?
The energy audit is much more than a simple assessment of a home’s performance. It is a comprehensive diagnosis aimed at measuring energy efficiency and identifying energy loss points. Here are the main components of this audit:
- Detailed analysis of the building: Evaluation of thermal characteristics, consumption habits, as well as hot water production and heating equipment.
- Performance estimates: Use of data from the Energy Performance Diagnosis (DPE) to assess consumption and CO2 emissions.
- Proposed works: Development of possible improvement scenarios with implementation priorities.
During this audit, a financial analysis is also carried out, providing an estimate of potential savings, the cost of necessary works, and available aids, notably MaPrimeRénov’. This report serves as a true guide towards better energy performance.
The distinctions between energy audit and DPE
It is important to distinguish the energy audit from the Energy Performance Diagnosis (DPE). The DPE provides an instant overview of the energy performance of the home, based on a summary assessment of energy consumption. In contrast, the energy audit offers an in-depth analysis and specific recommendations to improve this performance, thus making their joint realization essential, especially for homes classified F or G.
Why an energy audit before heating works?
When considering changing heating systems, the energy audit helps identify the most relevant and profitable types of works. Here are some significant advantages of this approach:
- Optimization of expenses: The audit helps prioritize works that will offer the best return on investment.
- Improvement of comfort: Assessing real heating needs helps enhance the quality of life within the home.
- Enhancement of property value: By increasing energy efficiency, the completed works can help raise the property’s value.
- Compliance with regulations: Adhering to legal obligations avoids penalties when selling a property.
Process of an energy audit
The energy audit process takes place according to several well-defined steps:
- Contact with a professional: Select a competent auditor, preferably a certified professional such as those from Bureau Veritas or DEKRA.
- On-site visit: The auditor gathers essential data about the building, such as energy consumption habits and insulation quality.
- Energy assessment: Using specialized software, analyses are conducted to quantify losses and optimize the proposed heating system.
- Audit report: The final report outlines improvement scenarios and specific recommendations based on detailed energy calculations.
- Cost analysis: Estimation of the necessary works to optimize energy performance as well as potential financial aids available.
Each audit is a step towards improvement, achieved through collaboration with a recognized expert, such as an audit registered under the Qualitel or EnergiePositive standards.
The cost of an energy audit and its financing
The average cost of an energy audit generally varies between 800 and 1200 euros. However, the price may fluctuate depending on several elements:
| Criterion | Impact on cost |
|---|---|
| Size of the home | The larger the area, the higher the cost. |
| Complexity of the building | Older homes or ones with architectural features may require more analyses. |
| Location | Prices are often higher in ĂŽle-de-France. |
| Qualification of the professional | Certified or recognized experts may charge higher rates. |
To support individuals in this approach, MaPrimeRénov’ may cover part of the costs related to the audit. However, caution is needed; certain conditions must be met:
- The housing must be over 15 years old.
- The application form must be submitted before signing any work commitment.
- The audit must be carried out by a certified RGE professional.
Available aids for energy renovation
As part of the energy transition, several government aids have been established to encourage renovations. In 2025, here are some of the main subsidies:
- MaPrimeRénov’: This includes specific aids for energy audits.
- Eco-loan at zero interest: Allows financing of works carried out after the audit without paying interest.
- Aids from energy saving certificates (CEE): Vary based on the nature of the works.
It is important to inquire with platforms like France RĂ©nov’ to discover all available aids based on personal circumstances. This can significantly alleviate the budget for necessary works following the energy audit.
FAQ on energy audit
- Who can perform an energy audit?
An audit must be conducted by a qualified and certified RGE professional. - What is the timeline to receive an energy audit?
Generally, the report is delivered within a few weeks after the on-site visit. - Are the results of an audit binding for the owner?
While the audit provides recommendations, it is not mandatory to carry out the works. - Can I benefit from aids if I have not yet conducted an audit?
No, the energy audit must be conducted before one can benefit from the aids.