You have one or more accommodation you want Improve the DPE ? With the prohibition scheduled for 2028 to rent accommodation considered as thermal ties, it is not in fact more profitable to have buildings classified F or G.
Well, did you know that the installation of photovoltaic panels can significantly increase the diagnosis of energy performance of a house? In this article, we will see together theImpact of the solar panels on the DPEIn addition to some suggestions to optimize their installation to improve the note of your accommodation.
DPE and solar panels: in short
- F and G Classified The accommodation will not soon be able to rent
- The car -photovoltaic contest satisfies one of the three criteria of the 3Cl method to calculate the DPE of a house
- It is possible to optimize the impact of the solar panels on the DPE, paying attention to their number, their exposure and the type of operation chosen (car -consumo vs total resale)
Point on recent developments in the PC
In order to fully understand the link between DPE and Solari panelsFirst of all, it is necessary to carry out a quick inventory on recent developments in the diagnosis of energy performance. To start, we briefly remember what the DPE is.
What is the DPE?
DPE, or diagnosis of energy performance, is a Estimation of energy consumption and greenhouse gas emission rate (GHG). Set in 2006 by Ademe, this document is mandatory to be able to sell or rent a property.
The DPE is measured using a note that can go A for cheaper accommodation, up to G for the most energetic delightful. It is attributed on the basis of the nature and efficiency of the various energy equipment of the accommodation, in particular the heating devices of the hearth and domestic hot water, lighting, ventilation or insulation.
DPE and Decree of March 31, 2021
From the decree of 31 March 2021, the DPE consists of two separate labels, in order to clarify the information provided:
- Energy labelwhich indicates energy efficiency: from a (very effective) to g (very consumerous energy).
- The climatic labelwhich presents the amount of greenhouse gases issued: from a (very low) to g (very strong).
It is from the decree of March 31, 2021 that the presence of solar panels within an accommodation is taken into consideration in the calculation of its DPE.
Impact of the climate and resilience law on the PC
The climate and resilience law, published in the official magazine on August 24, 2021, strongly shaken the world of the real estate sector Mandatory obtaining obtaining a good DPE for any accommodation for sale or for rent.
The main objective of this law is to reduce greenhouse gas emissions in France at least 40 % by France by 2030 compared to the 1990 figures. For this reason, it requires the implementation of strong measures in different fields, such as work, travel, consumption, artificialization of land or properties.
As for this last topic, the key points to remember are as follows:
- Freezing of the rent for the thermal Colans : The owners of accommodation ranked F or G have the right to increase the rent from 24 August 2022.
- The gradual ban for the energy rental of housing energy : January 1, 2023 for G+, January 1, 2025 for G, January 1, 2028 for F and January 1, 2034 for the E.
- The obligation to perform a PCL for collective residenceswhich must therefore be renewed every 10 years.
- The obligation to perform a regulatory audit Real estate in single ownership the least well classified before their sale: April 1, 2023 for the accommodation ranked F and G, 1 January 2025 for the classified goods and on January 1, 2034 for the buildings classified D.
Calculation of the DPE with the 3CL method
The criteria taken into consideration with the 3CL method
The DPE is calculated thanks to the Method 3CLwhich takes into account three categories of separate data:
- Losses : These are all causes that translate into heat loss, that is mainly insulation defects in the attic, walls, doors, windows and possibly the floor. This category is very important, since it has a direct impact on others: regardless of the performance of the devices, if the heat has produced losses outside your home, the latter will remain extremely consumer.
- The performance and the power source of your equipment Fireplace heating, heating of domestic hot water, air conditioning and ventilation (VMC, VMR, etc.), which is the most consumerous energy equipment of energy.
- The presence or absence of an energy production systemIn particular, an installation of solar panels.
3CL method and solar panels
Since it is the heart of our subject, we take a closer look at the data relating to the solar panels that influence the calculation of the DPE.
The 3CL method estimates the daily production of photovoltaic panels by multiplying 5 specific factors by each installation:
- The surface of the sensors installed
- An average return of 17 %
- The average sun rate of the affected geographical area
- The weighting coefficient, which is determined by the orientation and inclination of the roof
- The loss coefficient (0.86)
The result will therefore be divided by the living area.
Well, we are clear: we are well aware that this barbarian calculation does not really illuminate you on the relevance of having a photovoltaic installation in order to improve the diagnosis of energy performance! So we get closer a little more clearly to the positive impact of the solar panels on the PC.
The impact of the solar panels on the DPE of accommodation
Direct improvement of the DPE
As we have just specified, the presence of energy production equipment is one of the three criteria for calculating the 3CL method to evaluate the accommodation DPE. However, photovoltaic solar panels are the most common type of installation, just before the solar and hybrid solar panels.
IMPORTANT: the greater the surface of the installed solar collectors, the higher the performance, the more the presence of solar panels will have an impact on the DPE note. Think about when your photovoltaic panels!
A decrease in energy consumption
The calculation of the DPE also takes into consideration the share of autonomous calendar electricity inside your home. As a reminder, the car -Consume consists in the use of energy produced by solar panels as a priority to provide the electrical equipment of your accommodation.
It is completely logical, since it is a green, renewable and 100 %renewable energy. Its impact on the climate is much lower than the electricity available through the Enedis public distribution network.
The presence of solar panels therefore has a significant impact on the DPE note Assigned to your accommodation!
How to optimize the DPE gain thanks to the solar panels?
Choose adequate size and performance
As mentioned above, the surface of the sensors installed and the surrender of the panels are 2 of the 5 criteria taken into consideration with the 3CL method to calculate the production capacity of the photovoltaic power plant.
To be very clear: The greater the sun installation, the more photovoltaic panels have a positive impact on the DPE note.
It is therefore very important:
- Choose quality solar panels showing a good return
- To better calculate the power (and therefore the dimensions) of the installation so that its production covers your electricity as much as possible
Remember that you can resell your production surplus with EDF OA. It is therefore always better to overestimate the needs of self -consions than underestimate them.
Optimizes the orientation and inclination of your panels
The weighting coefficient, another of the five criteria taken into consideration by the 3Cl method to evaluate the DPE of accommodation, is determined by the inclination and orientation of the solar panels.
As a reminder, it is quite easy to optimize this coefficient by positioning the modules according to:
- An orientation to the south
- An inclination between 30 and 35 ° compared to the ground
To know everything in detail on the ideal exhibition of solar installations, go to our guides regarding the orientation and inclination of the photovoltaic panels.
Promote the car -with a total resale for a total resale
You will understand when you read this article: the energy consumption produced directly within your accommodation has a substantial positive impact on the note assigned.
It is therefore strongly It is advisable to choose a car operation -consumo rather in total resale. This advice is also valid for accelerating and optimizing the profitability of photovoltaic installation.
Available subsidies to improve the DPE thanks to photovoltaic panels
There are devices set up by the State to help you finance the installation of solar panels in order to improve the DPE of your property. In detail.
The car for the car -consumo
The car for car -consumo is an investment prize made available to owners who wish to install a photovoltaic installation of a power of less than 100 kWc.
To discover his conditions of eligibility and the amounts granted, go to our complete guide dedicated to the self -preventive prize.
EDF (EDF OA) purchase obligation
The obligation to purchase, managed by Edf OA, is a subsidized system that offers the repurchase of your electricity at a fixed price for 20 years. This is a reliable way to guarantee the profitability of photovoltaic installation over time.
Reduced rate VAT
You can take advantage of a 10 % reduced VAT speed for the installation of a solar plant with a maximum power of 3 kWc.
Frequent questions about solar panels and the DPE
latest posts published
Rental price of the photovoltaic roof
Climate and resilience and photovoltaic law: 3 -point regulations
![Solar panel: optimal inclination and orientation [2025]](https://www.ingles.top/wp-content/uploads/2025/05/1748306003_Solar-panel-optimal-inclination-and-orientation-2025.jpg)
Solar calculation panels of the surface: the formula!
Optimizing electricity consumption with the Ecojoko monitoring application
Photovoltaic kit or sun installation: for what do you use?
Financia your agricultural photovoltaic hangar thanks to solar
Photovoltaic connection: cost, obligation and operation
DPE and Solari panels: know the whole 2025
Passive House: Construction and profitability price
