Tacit planning permission: caution – the processing period may be suspended by a request for documents

Imagine: you are a property owner in Doullens, you submit a planning application to extend your house. Weeks pass, no sign from the administration. You think to yourself: "Perfect, the tacit permission is acquired!" You start the works. This is a fatal mistake, as a resident of the Somme learned to his cost in a case decided by the Court of Cassation in 1986.

The question is simple: when does the processing period for a planning application actually run? Many believe it starts when the application is submitted. But Article R. 421-13 of the French Urban Planning Code (the text that sets the rules) provides a major exception: if the administration requests additional documents from you, the clock only starts when those documents are received. In other words, an incomplete application can indefinitely block the acquisition of a tacit permission.

This decision, although dating from 1986, remains an absolute reference. It protects the administration and traps overly confident applicants. In this article, I will tell you this story, explain the judges' reasoning, and above all give you the keys to avoid finding yourself in the same situation. Whether you are in Camiers, Doullens or elsewhere, these rules concern you.

The facts: a story like many that happen every day

Mr. X, a property owner in Doullens, submits a planning application to the departmental directorate of equipment (the predecessor of the DDT). His project: an extension to his house. He submits a file he considers complete. But the administration sends him a letter – which he acknowledges having received – requesting additional documents. Mr. X does not follow up. He waits. Months pass. Convinced that the legal processing period (two months at the time) has elapsed, he considers himself the holder of a tacit planning permission. He starts the works.

Problem: the administration refuses the permission, then initiates criminal proceedings for a breach of the Urban Planning Code (construction without permission). Mr. X is convicted at first instance, then on appeal. He appeals to the Court of Cassation. His argument: the processing period had elapsed, so the tacit permission had come into existence. He could not be prosecuted for lack of permission.

The Court of Cassation, in its judgment of 18 November 1986 (No. 85-96.189), dismisses his appeal. It recalls that, according to Article R. 421-13 of the Urban Planning Code, the processing period only runs from the receipt of the requested additional documents. However, Mr. X never provided them. Therefore the period never started. No tacit permission. The offence is established. The lower courts correctly applied the law.

What is striking in this case is the disproportion between the applicant's negligence (a simple letter not followed up) and the consequences: a criminal conviction, potentially illegal works, and procedural costs. A lesson that many property owners learn to their cost.

The reasoning of the court – explained

The heart of the dispute concerns the interpretation of Article R. 421-13 of the Urban Planning Code (now codified in Article R*423-22 of the same Code). This text provides that the processing period for a planning application runs from the receipt of the complete file by the town hall. But it also provides that if the file is incomplete, the administration must request the missing documents by registered letter with acknowledgement of receipt. And then, the period only begins when those documents are received.

In short: it is the applicant who controls the triggering of the period. As long as he has not provided everything requested, the clock remains at zero. The Court of Cassation validates this mechanism. It considers that the lower courts correctly applied the law. It rejects the ground of appeal that alleged a violation of Articles R. 421-13 and R. 421-18.

What few people know is that this solution has been constant for decades. The Court of Cassation has never wavered. It protects the administration against applicants who submit shoddy files solely to start the clock running. It also makes the applicant responsible: it is up to him to ensure that his file is complete and to respond to the administration's requests.

In its decision, the Court does not rule on the merits of the permission, but on the regularity of the procedure. It confirms that the offence is committed as soon as the works are carried out without a valid permission. It does not matter that the applicant honestly believed in a tacit permission. Ignorance of the rule is no excuse.

In other words, if the administration requests documents from you, you must provide them, and it is only afterwards that the processing period begins. If you do not do so, you can never claim to have obtained a tacit planning permission. The Court is clear: "failing to have provided the requested documents, the applicant cannot therefore claim to have obtained a tacit planning permission".

This solution is logical: it prevents incomplete files from giving rise to implied authorisations. But it is also harsh for individuals who do not master the subtleties of administrative procedure.

What this means for you – practically

If you are a property owner and you submit a planning application, this decision directly concerns you. It means you must be extremely vigilant upon receipt of any letter from the administration. A simple letter requesting a cross-section plan, a design statement or a certificate of conformity can suspend the processing period. If you do not respond, you will never obtain a tacit permission, even after years.

Let's take a concrete example: you are a property owner in Camiers and you submit a planning application for a conservatory. The administration writes to you requesting a document confirming that your land is not in a flood zone (which is common on the coast). You forget to respond. Six months later, you start the works, convinced that the tacit permission is acquired. Mistake: the administration can issue a summons for construction without permission. The consequences? A criminal fine (up to €120,000 and 6 months' imprisonment for the most serious cases), an obligation to demolish, and difficulties in reselling the property.

For real estate professionals (agents, notaries, developers), this case law is a reminder: during a transaction, it is necessary to check that the planning permission is final and not capable of being challenged. A poorly acquired tacit permission can be challenged years later, with disastrous consequences for the buyer.

undefined, I have encountered cases where property owners bought a house with an extension built without a valid permission. Result: years of proceedings to regularise, high legal fees, and sometimes the obligation to demolish. Prevention is therefore essential.

If you are in this situation, you must:

• Carefully keep all letters from the administration, especially requests for additional documents.
• Respond in writing, preferably by registered letter with acknowledgement of receipt, within the time limits given (usually one month).
• Never start the works before obtaining an express permission or a certificate of non-opposition.

In case of doubt, a consultation with a lawyer specialised in property law can save you a lot of trouble.

Four tips to avoid this type of dispute

• Prepare a complete file from the start. Before submitting your application, check the list of documents required by the Urban Planning Code (Article R*431-1 and following). Do not hesitate to consult the town planning department of your town hall or an architect. A well-prepared file reduces the risk of a request for additional documents.
• Acknowledge receipt of all letters from the administration. As soon as you receive a letter from the DDT or the town hall, open it immediately. If it contains a request for documents, respond within the month. Preferably use registered post with acknowledgement of receipt to keep proof.
• Never assume a tacit permission. Even if the legal period has passed, wait until you have an official document (permission order or certificate of non-opposition). Starting works without this document is a risk.
• Get professional assistance. If your project is complex (extension, new build, plot division), an architect or a lawyer can help you prepare the file and follow the procedure. The investment is often less than the cost of a dispute.

Besoin d'un conseil personnalisé ? Contactez Maître Zakine — première consultation 30 min à 45€.

Further reading: related case law and developments

This 1986 decision is part of a consistent line of authority. For example, a judgment of the Council of State of 22 February 1993 (No. 118354) specifies that the request for additional documents must be made by registered letter with acknowledgement of receipt, and that the processing period only runs from the receipt of those documents. More recently, the Douai Administrative Court of Appeal (within whose jurisdiction Amiens falls) reaffirmed this principle in a judgment of 12 July 2018 (No. 17DA00627).

The trend of the courts is therefore to protect the administration and to require applicants to exercise maximum diligence. There is no reversal in sight. On the contrary, the texts have been strengthened: since the 2007 reform, the processing period is two months for a single-family home and three months for other constructions, but the suspension mechanism remains identical.

What this means for the future: vigilance remains essential. If you submit a planning application, follow it actively. Do not rely on the administration's silence to obtain a right to build.

Checklist before taking action

1. Have I checked that my planning application file is complete? Consult the official list of documents (Articles R*431-1 to R*431-33 of the Urban Planning Code).
2. Have I received any letter from the administration since the submission? If yes, re-read it carefully. Does it request additional documents? If yes, prepare your response as soon as possible.
3. How much time has passed since the submission or the last provision of documents? The processing period runs from the date of receipt of the complete file. If you have provided documents upon request, the period starts again from zero.
4. Have I obtained an official document (permission order, certificate of non-opposition)? Without this, do not start the works. A tacit permission is not automatic and can be challenged.
5. In case of doubt, have I consulted a lawyer? A first 30-minute consultation can save you months of proceedings.

Are you in a similar situation? A first 30-minute consultation with Maître Zakine (€45) can save you months of proceedings – and often much more. Book an appointment →