Solar panels on a house: the steps to take before the work

To install solar panels on a house in France, first check the local rules, then obtain the appropriate planning permission before starting the work. Installation on a roof generally requires a prior declaration at the town hall. Depending on the connection and sale of electricity, procedures with the network operator and compliance formalities may also be required.

The solar panel procedures therefore follow a precise order: check the local urban plan (PLU), qualify the project, prepare the file, wait for the administrative decision, then organize the connection and commissioning. This process helps you avoid an impossible quote, an incomplete file, or an installation different from the authorized one.

How to check the rules applicable to the house and the land?

Start with the town hall, because planning rules are not limited to the power of the panels. The local urban plan may regulate the appearance of the roof, colors, slope, visibility from the street, or the integration of equipment. A house located in a protected area may also be subject to specific heritage constraints.

A commercial estimate does not constitute an administrative confirmation of the project’s feasibility. Request a written response or a formal exchange with the urban planning department when the plot is near a historic monument, in a classified site, or in an area where the intervention of the architect of the buildings of France may be required.

“The power of the panels is not enough to determine the authorization: the location, height, external appearance, and local rules also matter.”

Points to check with the town hall

Prepare the information that allows the urban planning department to quickly identify the project. A vague request about “solar panels” does not always allow obtaining a usable response for submitting the file.

• The full address and cadastral references of the plot.
• The PLU rules applicable to the roof, facades, and visible equipment.
• The procedure provided for an installation on the roof or on the ground.
• The possible presence of a protected perimeter or a neighboring historic monument.
• Additional documents requested by the municipality or the competent service.

Agreements to obtain outside of urban planning

A town hall authorization does not replace the necessary private agreements. A house located in a collective complex may be subject to condominium rules, subdivision regulations, or rules established by a homeowners’ association.

Also verify that you are authorized to intervene on the concerned part of the roof. Prior agreement may be necessary when the project concerns a common part, shared equipment, or land owned by several people.

What planning permission is required for solar panels?

The formalities depend on whether the installation is on a roof or on the ground, the building concerned, the power, the height, and the location zone. For photovoltaic panels installed on the roof of an existing house, a prior declaration is generally required; confirm the applicable formality with the town hall. Ground installations and new constructions require a separate verification.

Project situation	Procedure to consider	Point of attention
Panels on an existing roof	Prior declaration generally necessary	Modification of the exterior appearance, visibility, and local urban plan rules
New construction	Authorization to be examined within the overall project	Describe the panels in the overall building project
Ground installation	Formality varies according to height, power, footprint, and zone	Have the rule confirmed by the town hall before concluding an exemption
House in a protected area	Procedure may involve additional constraints or opinions	Anticipate heritage instruction and specific documents
Extension or major transformation	Procedure to be determined with the complete project	Do not isolate the panels from the rest of the work

When is a prior declaration generally considered?

A prior declaration generally concerns a photovoltaic installation placed on an existing roof when it modifies the exterior appearance of the house. The file must present the layout of the panels, their placement, their tilt, their color, and their visual integration.

The prior declaration can be submitted online, at the counter, or on paper form according to the procedures set by the municipality. Use the process indicated by the town hall and keep a complete copy of the submitted file.

When can a building permit or a particular procedure come into play?

For a new construction, the panels must be examined with the authorization of the overall project. An extension or a major transformation may also require examining the entire project instead of treating the panels separately.

A ground installation is not determined solely by the power announced by the manufacturer. The thresholds of height, power, ground footprint, and rules related to protected zones must be checked in the precise context of the plot. The town hall must confirm the applicable formality before ordering the equipment.

How to secure the choice of installer and the content of the quote?

The quote must serve as a reference document for the procedures, not just a price proposal. Request the company’s qualifications, its insurance, applicable warranties, and references concerning a comparable configuration. Check notably the installation, waterproofing, any roofing work, the inverter, and the panels.

The quote must describe the configuration that will be declared and then installed, without discrepancy between the power, the number of panels, and their placement. A modification decided after submission may require a new administrative verification.

Checks to make before signing

• Compare several quotes describing the same power and the same installation method.
• Specify who prepares and submits the declaration to the town hall.
• Identify the person responsible for the connection request with the network operator.
• Verify the warranties on the panels, the inverter, the installation, and waterproofing.
• Include the services provided: administrative file, connection, compliance, and commissioning.
• Request a clause specifying the consequences of a refusal or prescriptions imposed by the town hall.

Beware of promises of yield, income, or aids that do not mention their application period or conditions. Aids, purchase tariffs, and tax rules evolve; their presence in a quote is not sufficient to establish a right.

How to prepare a complete authorization file?

An authorization file must allow the town hall to understand the project without having to reconstruct the information from a commercial quote. Gather cadastral data, the description of the existing building, the dimensions of the panels, and their exact location.

Documents to check before submission

1. Gather the project identification: address, cadastral references, type of building, and description of the work.
2. Describe the installation: number of panels, dimensions, power, layout, tilt, color, and visible equipment.
3. Prepare the necessary plans: location plan, site plan when required, roof sketch, and plans of the relevant facades.
4. Add photographs: views of the near and distant environment, with particular attention to visibility from the street.
5. Present the future appearance: representation of the house after the work and insertion of the panels into their environment.
6. Proofread the file with the quote: the power, position, color, and number of panels must correspond.

The required documents may vary depending on the municipality and the heritage context. A protected area may require a more precise representation of the visual integration or additional documents.

“A complete file is a coherent file: the plans, photographs, quote, and future installation must all relate to the same project.”

Errors that delay processing

• Forgetting a document or submitting a plan that does not allow the house to be located.
• Neglecting the visibility of the panels from public spaces or neighboring properties.
• Indicating a power or location different from those planned in the quote.
• Starting work after only an oral exchange with the town hall.
• Assuming that a ground installation is exempt from formalities without checking the height, power, and zone.

How to submit the application to the town hall and wait for the decision?

Submit the prior declaration through the channel offered by the municipality: online service, counter, or mail. Keep the form, plans, photographs, receipt, and any proof of submission. The applicable processing time must be confirmed with the town hall, as it may vary depending on the project or area.

The starting point of the deadline must be identified with the town hall, and any requests for additional documents must be followed up in writing. A request for missing documents can alter the course of processing; do not consider administrative silence as an immediately exploitable authorization without verifying the file.

Understanding deadlines without generalizing

Ask the town hall for the expected date of completion of processing and check if the project falls within an area subject to particular constraints. The applicable deadline must be confirmed for your file; it does not guarantee the same for all houses.

If no response is received by the end of the applicable deadline, the possible effects of administrative silence must be checked with the municipality, especially if the file has been subject to a request for documents or if a particular procedure concerns the parcel.

After approval or in case of refusal

Read the order or decision received before giving the go-ahead to the installer. An authorization may be subject to conditions regarding the layout, color, visibility, or integration methods of the panels.

In case of refusal, ask the town hall for the specific reasons and study possible modifications before resubmitting. A refusal does not allow starting the work, even if the installation seems technically feasible.

How to anticipate the connection and mode of electricity use?

After the urban planning authorization, define the fate of the electricity produced: total self-consumption without injection, self-consumption with sale of surplus, or sale of production. Connection to the grid and associated contracts are not automatic after the installation of the panels.

Procedures with the network operator depend on the mode of electricity use and the network concerned. In self-consumption without injection, surplus sale, or production sale, ask the network operator and the installer about the formalities, agreements, and contracts applicable before starting the project.

Procedures to organize with the installer and the network operator

1. Choose the mode of operation: self-consumption without injection, sale of surplus, or total sale.
2. Identify the network manager: if your public network is managed by Enedis, specify who submits and follows up on the request.
3. Provide technical information: power, connection diagram, address, urban planning authorization, and installation characteristics.
4. Check the contracts: request the agreements, access, operation, or purchase contracts applicable to the chosen scenario.
5. Anticipate compliance: ask if a Consuel certificate is necessary for your installation and your type of injection.
6. Wait for commissioning: verify the applicable conditions before any injection into the network.

“The authorization to install panels and the formalities related to electricity injection correspond to two different procedures.”

The conditions for issuing a certificate of conformity and its role in the connection depend on the configuration of the installation. Have the applicable formalities confirmed by the installer, the network manager, or Consuel before the work begins.

How to finalize commissioning and keep the supporting documents?

The final step is to verify that the installed system corresponds to the authorization, the quote, and the technical documents. Commissioning with the network manager may require compliance documents when the connection provides for it.

Checklist before starting the work

• Local rules, PLU, and any heritage protections verified.
• Urban planning authorization identified, submitted, and decision or applicable deadline checked.
• Co-ownership or subdivision agreements obtained if necessary.
• Quotes, insurance, guarantees, and distribution of procedures validated.
• Mode of electricity use and connection studied.
• Compliance documents, contracts, and formalities after installation anticipated.

Documents to keep after installation

Keep the signed quote, invoices, plans, urban planning authorization, certificates, guarantees, technical manuals, and contracts related to the connection or sale of electricity. Inform your insurer if your home insurance contract or the nature of the work requires it.

Tax and declaration formalities depend on the mode of use of the produced electricity and your situation; consult the tax authorities to know the applicable rules.

Solar panel procedures are therefore secure when the town hall’s decision precedes the work, the connection is handled separately, and each document corresponds to the actual installed system. In case of refusal, dispute, or complex heritage situation, seek help from the town hall, a qualified professional, or a competent lawyer.

Sources and references

Regulatory rules, connection procedures, certificates of conformity, and tax rules must be validated by a human review before publication based on precise official pages corresponding to the project’s situation.

Frequently asked questions

Is a prior declaration always required to install solar panels?

Installing photovoltaic panels on the roof of an existing house generally requires a prior declaration. A ground installation, new construction, or protected zone may be subject to different rules. The town hall must confirm the applicable formality for the plot.

Can work begin as soon as the prior declaration is submitted?

Submission does not mean the project can be executed immediately. Wait for the end of the applicable deadline and check the decision, any prescriptions, or requests for additional documents before starting the work.

Who must submit the authorization request at the town hall?

The owner can submit the request, or appoint the installer when they offer this service. The person responsible for the submission must be identified in writing, and the owner must keep a complete copy of the submitted file.

What timeframe should be expected for a prior declaration of solar panels?

The applicable timeframe depends on the file and the context of the plot. A protected area, a request for documents, or a specific procedure may alter the schedule. Ask the town hall for the expected processing date.

Is the connection to the grid automatic after town hall authorization?

No. The urban planning authorization concerns work on the building or land, while the connection is handled by the network operator. Compliance formalities and contracts may be required depending on the mode of electricity use.