Building Permit Timelines and Third-Party Appeals in France

Once your building permit application (permis de construire) has been filed with the town hall, the countdown begins. Between the processing period, mandatory site notice, third-party appeals and prefect withdrawal, your permit is only truly secure after several months. Understanding this timeline is critical: starting work too early risks being ordered to demolish everything. Here is the exact sequence, step by step, to protect your self-build project in France.

The building permit processing period

The processing period is the time during which the town hall reviews your application and decides whether to grant or refuse the permit. It starts the day after complete submission of the application.

Standard processing periods

For the vast majority of self-builders (single-family home), the wait is 2 months.

When the period is extended

The processing period can be extended by 1 additional month in several cases:

• Listed or registered heritage site, protected area, or historic monument perimeter → consultation with the Architecte des Batiments de France (ABF)
• Building open to the public (ERP)
• Consultation with the safety or accessibility commission
• Project in an area subject to a specific easement (PPRN, PPRI, AVAP)

In protected areas, the period can reach 6 months. The town hall must notify you of any extension within 1 month of submission.

Request for additional documents

Within the first month, the town hall may request additional documents if your application is incomplete. This suspends the processing period. You then have 3 months to provide the documents; after this deadline, your application is tacitly rejected.

Once the documents are submitted, the clock restarts from zero. This is why a complete, well-prepared application from the outset saves weeks. To prepare your application properly, see our guide on assembling your building permit application.

The tacit permit: silence as consent

If the town hall does not respond before the processing period expires (and without having requested additional documents), your permit is tacitly granted. This is known as the tacit permit.

How to formalise it

A tacit permit is not a letter — it is a non-event. To formalise it, you can request a certificate of non-opposition from the town hall. This certificate is required to:

• Justify your position with your bank (releasing the loan)
• Present to the notary (land purchase)
• Display on the site notice board

Cases where the tacit permit does not apply

A tacit permit is never possible in certain cases:

• Project on a listed or registered heritage site
• Project subject to the binding opinion of the ABF
• Project in a protected area
• Building open to the public

In these situations, the absence of a response constitutes implicit rejection.

Posting the permit notice: a key step

Once your permit has been granted (or tacitly obtained), a step that is often overlooked but fundamental must be followed: posting the site notice board on the land.

Why it is mandatory

Posting the notice triggers the third-party appeal period. Without proper posting, this period never starts: your neighbours can challenge your permit years after work begins. This is the most common and most costly mistake made by self-builders in France.

Requirements for the notice board

The regulatory notice board must:

• Measure at least 80 x 80 cm
• Be visible from the public highway
• Be installed as soon as the permit is notified (or as soon as the tacit permit is acquired)
• Remain in place for the entire duration of the works
• Display the following mandatory information:
  • Name of the permit holder
  • Date and reference number of the authorisation
  • Nature of the project and address of the town hall
  • Land area and floor area
  • Height of the building
  • Notice of third-party appeal rights (mandatory mention)

Ready-made notice boards are available in DIY stores for 10 to 20 euros.

Third-party appeals: 2 months of vigilance

This is the most stressful phase of the administrative process. For 2 months from the first day of continuous posting, any interested third party (neighbour, association, local resident) may challenge your permit before the administrative court (tribunal administratif).

Who can file an appeal

For an appeal to be admissible, the claimant must have standing to sue: the construction must directly affect their conditions of occupation, use or enjoyment of their property. In practice:

• Immediate neighbours: admissible almost automatically
• More distant neighbours: must demonstrate a specific nuisance (view, shadow, traffic)
• Associations: must have been formally registered before the permit application was filed
• Passers-by or mere onlookers: no standing to sue

Common grounds for appeal

Steps in an appeal

1. Informal administrative appeal (optional but common): the neighbour writes to the town hall requesting withdrawal. The town hall has 2 months to respond.
2. Litigation appeal: filed with the administrative court. If an informal appeal was made, the 2-month deadline to refer the case to the court restarts from the town hall’s response (or its silence).
3. Notification to the permit holder: the claimant must notify you of their appeal within 15 days (article R.600-1). Without notification, the appeal is inadmissible.
4. Court proceedings: 12 to 24 months on average.

Prefect withdrawal: 3 more months

Alongside the third-party appeal period, the prefect has 3 months from the date the permit is transmitted by the town hall to exercise legality oversight and, if necessary, request the town hall to withdraw the permit on grounds of illegality.

This is rare in practice, but it occurs when:

• The permit manifestly violates the PLU
• A major easement was not respected
• The land is in a non-buildable flood zone

Consolidated timeline

For a permit to be final and clear of all appeals (appeal period clearance), you must wait:

• 2 months of posting without a third-party appeal
• 3 months without prefect withdrawal

In practice, this means 3 months from posting (the prefect’s deadline encompasses that of third parties).

When should you actually start works?

This is the 100,000-euro question. Three options depending on your risk profile.

Option 1 — Start after 2 months of posting

This is the legal minimum. You can begin earthworks and foundations. However, the prefect can still intervene for another month, and a neighbour may file an informal administrative appeal that has not yet been notified to you.

For whom: simple projects, neutral neighbourhood, no particular sensitivity.

Option 2 — Start after 3 months (full clearance)

The permit has cleared all appeals except any that may have been filed without notification (which would make them inadmissible, but verification is still needed). This is the recommended approach for most self-builds.

For whom: standard project, familiar neighbourhood, no tension.

Option 3 — Start after checking with the court

You wait 4 months and verify at the administrative court clerk’s office that no appeal has been filed. This is the safest option.

For whom: sensitive projects, difficult neighbourhood, boundary-adjacent plot, project value above 200,000 euros.

Permit validity and actual start of works

Once the permit has cleared all appeal periods, do not delay starting.

To formally record the start of works, file a Declaration of Works Opening (DOC) with the town hall. This is the official proof that the permit has been “activated”.

Consolidated timeline for a typical project

Here is what the timeline looks like for a single-family home building permit, without incident:

For the steps that come before (planning certificate, soil survey, plans), also see our guides on the planning certificate (certificat d’urbanisme) and PLU zoning rules and setback requirements.