Building permit time limits 2026: everything you need to know

Obtaining a building permit (permis de construire) is often a crucial step in your property project, but it can quickly become a source of anxiety given the complexity of the time limits to be met. Between the examination period of the authority, the possibilities of appeal and the regulatory changes planned for 2026, it becomes essential to master these deadlines in order to complete your construction successfully.

The examination period for a building permit: principle and length

Standard examination period

The examination period for a building permit varies according to the nature and complexity of your project. For a standard construction, the authority has two months from receipt of the complete file in which to decide. This period may be extended to three months where the project requires the opinion of other departments or bodies.

For constructions located in a protected area (secteur sauvegardé), a listed site or a site in the process of being listed, or within the field of visibility of a historic monument, the examination period automatically extends to four months. This extension allows the Architect of the Bâtiments de France (French heritage buildings architect) to examine whether the project complies with heritage requirements.

Starting point of the period

The period starts to run as soon as the authority has acknowledged receipt of your complete file. If documents are missing, it has one month to notify you of the list of items to be supplied. In that case, the examination only begins on receipt of the additional documents.

It is crucial to understand that this period is a maximum period. The authority may issue the permit before it expires, but it cannot in principle exceed it without legal consequences.

The changes planned for 2026

Increased digitalisation of procedures

The year 2026 will mark an important step in the modernisation of planning procedures. Fully digital building permit applications will be rolled out across the whole country. This change aims to reduce processing times and to improve the traceability of files.

This digital transformation will be accompanied by new tools allowing real-time tracking of the progress of your file. Notifications and exchanges with the authority will take place exclusively by electronic means, requiring practices to adapt for applicants and examining departments alike.

Harmonisation of time limits across the country

The government also plans to harmonise practices between the different municipalities. Some local authorities may benefit from shortened examination periods, particularly in high-demand areas where speeding up construction is a priority.

This harmonisation will be accompanied by a standardisation of the documents to be supplied, making it easier to put files together and reducing the risk of requests for additional documents that lengthen the examination.

The silence of the authority: tacit permission or implied refusal

Principle of tacit permission

Where the authority does not reply within the prescribed periods, silence is in principle treated as acceptance. This rule, laid down by the Code of Relations between the Public and the Administration, is an important protection for applicants against delays in examination.

However, this tacit permission is only acquired at the end of the legally prescribed examination period. It is therefore essential to know this period precisely according to your particular situation. Tacit permission has the same effects as express permission and allows you to start your works.

Exceptions to the principle

Certain particular situations derogate from this general rule. In particular, the silence of the authority may amount to refusal where the project is located in certain protected areas or is subject to specific regulations. These exceptions remain limited and must be expressly provided for by the texts.

It should also be noted that tacit permission does not exempt you from complying with planning rules. In the event of manifest non-compliance, the authority retains the possibility of starting regularisation or sanction procedures.

Time limits for appeals against the building permit

Appeals by third parties: time limit and procedure

Once the building permit has been granted, third parties have two months in which to bring an appeal against the permit before the administrative court. This period runs from the display on the land or the display at the town hall, whichever is later. The applicable time limits and the question of the suspensive effect of the challenge are set out in our article on third-party appeals against a building permit.

Display on the land is particularly important because it is often the effective starting point of the appeal period. The sign must comply with precise dimensions and mandatory particulars. Defective display may have the effect of postponing the starting point of the time limits, exposing the permit holder to late appeals. The regulatory particulars and format of the sign are set out in our guide to the building permit sign.

Appeal by the applicant in the event of refusal

Where your application is expressly refused, you also have two months in which to challenge this decision. This appeal against the permit decision may be preceded by an informal appeal (recours gracieux) to the authority that took the decision, extending the time for challenge accordingly.

The informal appeal has the advantage of allowing a dialogue with the authority and may lead to an amicable solution. It suspends the time limit for a contentious appeal while the informal request is being examined.

Validity and lapse periods of the permit

Initial period of validity

A building permit that has been granted remains valid for three years. This period runs from notification of the decision or, in the case of tacit permission, from the date on which that permission was acquired. After this period, the permit lapses if no works have commenced.

The commencement of works is assessed in practical terms. It is not enough to put up a hoarding or carry out preparatory works. Actual construction works must be undertaken, even limited ones, provided that they are directly related to the authorised construction.

Extension and renewal

It is possible to apply for an extension of the validity period. This application must be made at least two months before the initial period expires. The extension may not exceed one year and is granted only if the planning requirements and easements have not changed to the detriment of the project. On managing these deadlines within the timetable of a development, see our analysis of the validity period and extension of the permit.

If the permit expires, a new application becomes necessary. This new procedure will be examined under the rules in force at the time of filing, which may hold surprises if the regulations have changed in the meantime.

Time limits for completion of the works

Obligation to complete

Once the works have started, you have three years to complete them fully. This period runs from the actual commencement of the works, and not from the issue of the permit. Completion means carrying out all the authorised works, allowing actual use of the building.

Failure to meet this period may cause the permit to lapse in respect of the part not carried out. The authority may then require the land to be restored if the partly completed works harm the environment or safety.

Interruption and resumption of works

An interruption of the works for more than one year may jeopardise the validity of the permit. However, this interruption does not automatically cause the permit to lapse if it is justified by circumstances beyond your control.

In the event of resumption after an interruption, it may be prudent to inform the authority that the works are continuing, in particular if the planning rules have changed during the period of stoppage.

Managing time limits in practice

Optimising the examination period

To optimise the examination period of your permit, several precautions are needed. Putting together a complete file from the initial filing avoids requests for additional documents that prolong the examination. It is recommended to check all the mandatory documents according to the nature of your project.

Prior consultation of the planning departments may also prove beneficial. This informal step makes it possible to identify any difficulties in advance and to adapt the project to local regulatory constraints.

Monitoring and reminders

Regular monitoring of your file is necessary during the examination. Do not hesitate to contact the examining departments to ask about progress, particularly as the deadline approaches. This vigilance makes it possible to detect any malfunctions quickly.

If the statutory period is exceeded, a formal notice (mise en demeure) may be sent to the authority. This step is a useful preliminary before considering an action to have the tacit permission recognised.

Consequences of failing to meet time limits

Sanctions for the authority

The authority's exceeding of the examination period engages its liability. You may seek compensation for the loss suffered, in particular if the delay caused you additional costs or demonstrable financial losses.

This liability may be sought even in the case of tacit permission, if the delay caused you particular loss. Assessing this loss often requires experts to quantify the consequences of the delay precisely.

Risks for the applicant

Conversely, failure to meet the time limits that are incumbent on you may have significant consequences. Lapse of the permit obliges you to start the procedure again from scratch, with the risk of more restrictive rules being applied.

Late completion of the works may also expose you to administrative sanctions, and even criminal ones in the event of manifest non-compliance with planning rules.

Mastering the time limits relating to the building permit is a major issue for the success of your property project. The changes planned for 2026, in particular the full digitalisation of procedures, should make tracking easier and shorten certain time limits. However, the continuing complexity of these procedures justifies professional support to secure your approach and optimise your chances of success within the shortest possible time.

Frequently asked questions (FAQ)

What happens if the authority does not reply within the time limits?

In principle, the silence of the authority beyond the statutory examination period amounts to tacit permission. This permission has the same value as an express permit and authorises you to start your works.

Can I start the works as soon as I obtain the building permit?

No, you must wait for the third-party appeal period to expire, that is two months after display on the land. Starting before exposes you to the risk of a forced stoppage in the event of an appeal.

How is the appeal period against a building permit calculated?

The two-month period runs from the display on the land or at the town hall, whichever is later. Defective display may postpone this starting point.

How long does my building permit remain valid?

The permit remains valid for three years from its notification. You must start the works within this period, failing which it lapses.

Can I extend the validity of my building permit?

Yes, you may apply for an extension of one year at most, provided that you apply at least two months before the initial period expires.

What should I do if I cannot complete the works within three years?

An interruption of more than one year may cause the permit to lapse. It is advisable to inform the authority of the reasons for the interruption and to resume the works promptly.

Are the time limits the same everywhere in France?

The statutory time limits are the same, but some municipalities may benefit from accelerated procedures. The changes planned for 2026 aim at better harmonisation of practices.