Third-Party Appeals Against a Building Permit: Time Limits and Suspensive Effect

A neighbour discovers that a building is going to rise a few metres from their terrace and block their view. A developer, for their part, has just obtained a permit and wants to start the works without the risk of seeing it annulled after pouring the foundations. These two situations bring the same rules face to face, but with opposing interests: the person challenging wants to gain time and block the project, the person building wants to clear their permit as quickly as possible. This guide describes precisely the time limit for third-party appeals, the display of notice that triggers it, the absence of suspensive effect of an appeal and the mechanism of summary suspension proceedings (référé-suspension), then the levers available to the project owner (maître d'ouvrage) to secure the project.

The principle: a building permit remains enforceable despite an appeal

The first rule to understand, and one that often surprises the neighbour who challenges: filing an appeal against a building permit does not suspend that permit. The authorisation remains valid and the holder may start the works, unless they lose before the court or the court orders a suspension.

This absence of suspensive effect is laid down by Article L.600-3 of the French Town Planning Code. An appeal directed against a building permit, a development permit or a decision of non-objection to a prior declaration does not prevent the decision from being implemented. In practical terms, a project owner may start the works even while a contentious appeal is pending before the administrative court (tribunal administratif).

This choice by the legislature reflects a trade-off: to prevent a mere appeal, sometimes a delaying tactic, from paralysing property projects for years. The downside, for the neighbour, is that they will have to take an additional step, the summary suspension application, if they really want to prevent the works from starting while the court examines the merits.

Who can challenge a permit: the question of standing

Before even speaking of time limits, one must have standing to act. Not everyone can challenge a building permit. Town planning litigation has been deliberately tightened to limit appeals of pure opportunism.

Article L.600-1-2 of the French Town Planning Code requires the applicant to show that the construction, development or works authorised are likely to directly affect the conditions of occupation, use or enjoyment of their property. In other words, a neighbour cannot content themselves with invoking an abstract illegality of the permit: they must explain how the project harms them personally.

This standing is assessed at the date the permit application is displayed at the town hall. In practice, an immediate neighbour who suffers a loss of sunlight, an impairment of their view, new overlooking or traffic nuisance will readily establish this standing. An applicant living several hundred metres away, with no concrete link to the building, will see their appeal held inadmissible. Associations, for their part, are admissible only if their articles were filed at the prefecture before the application was displayed (Article L.600-1-1).

This requirement protects the project owner: it allows them, on receiving an appeal, to check whether the applicant really has standing to act and, where appropriate, to raise inadmissibility.

The time limit for third-party appeals: two months from display of notice

The core of the time limit for third-party appeals against a building permit comes down to one figure: two months. But everything depends on the starting point of this period, which is neither the date the permit was issued nor its notification, but the display of notice on the land.

Display on the land, the starting point of the period

Article R.600-2 of the French Town Planning Code lays down the rule: the time limit for contentious appeals by third parties runs from the first day of a continuous period of two months during which the authorisation is displayed on the land. It is therefore not the display at the town hall that triggers the period as regards neighbours, but the sign installed on the land, visible from the public highway.

This sign must comply with the mandatory particulars provided for by Articles A.424-15 to A.424-19: name of the beneficiary, date and number of the permit, nature of the project, area of the land, height of the building, floor area, and above all the statement of the avenues of appeal and time limits. The sign must be rectangular, with dimensions greater than 80 centimetres, and remain legible throughout the duration of the works. The obligations relating to this sign and the means of obtaining one are set out in our guide to the building permit sign.

For the neighbour who challenges, this display is crucial: as long as the sign is not properly displayed, the two-month period does not begin to run, and they retain the possibility of challenging. They therefore have an interest in photographing the sign, noting the date it appeared, or even having a commissaire de justice (bailiff) record the absence or irregularity of the display.

For the project owner, the stakes are the reverse and just as decisive: a display that is incomplete, illegible or intermittent does not start the period running. The permit is then never cleared and remains open to challenge, sometimes years later. This is one of the main sources of insecurity in a property transaction.

A time limit laid down by Article R.600-3 should be noted: no action for annulment may be brought more than six months after completion of the building, evidenced by the declaration attesting completion and conformity of the works (the DAACT). This safeguard protects the builder against very late appeals, even where the display was defective.

The administrative appeal to the issuing authority (recours gracieux), a step that extends the period

Before bringing proceedings before the administrative court, the neighbour may send the mayor, or the authority that issued the permit, an administrative appeal (recours gracieux) asking it to withdraw its decision. This appeal, made within the two-month period, extends the time limit for a contentious appeal: a new two-month period runs from the rejection, express or implied, of the administrative appeal.

This tool is strategic for the neighbour. It almost doubles the time available and sometimes opens a dialogue with the local authority. It also makes it possible to test the legal strength of the permit at lower cost, before embarking on contentious proceedings.

For the project owner, an administrative appeal is a warning signal: the period has not yet been cleared and litigation is in preparation. This is the moment to examine the file, check the conformity of the permit and, possibly, anticipate a regularisation by way of an amending permit.

The obligation to notify the appeal

Town planning litigation involves a formidable formalism for the applicant: Article R.600-1 of the French Town Planning Code requires the author of an appeal, administrative or contentious, to notify it both to the author of the decision (the town hall) and to the holder of the permit, by registered letter with acknowledgement of receipt, within fifteen clear days from the filing of the appeal.

Failing this notification, the appeal is inadmissible. Many neighbours' appeals fail on this point alone, for not having notified the beneficiary of the permit in time. The neighbour must therefore identify the holder precisely (the name shown on the sign) and keep proof of dispatch.

For the project owner, this notification is a valuable source of information: it officially warns them of the existence of an appeal and allows them to check immediately whether the formal requirements have been met.

The absence of suspensive effect and summary suspension proceedings

The question of whether an appeal against a building permit has suspensive effect is the one that gives rise to the most misunderstanding. The neighbour often believes that by challenging the permit, they freeze the works. This is not the case. The appeal on the merits may take one to two years to be decided, during which the building rises from the ground.

To really block the works, the neighbour must apply to the judge in summary proceedings for a suspension (référé-suspension), on the basis of Article L.521-1 of the French Code of Administrative Justice. This application is possible only if an appeal on the merits has been filed in parallel: suspension is ancillary to the action for annulment.

Summary suspension: urgency and serious doubt

Two cumulative conditions must be met. First, urgency: the applicant must show that implementation of the permit causes sufficiently serious and immediate harm to their interests. The mere start of a building site is generally regarded as establishing urgency, because once the building is erected, the situation becomes difficult to reverse. Second, a ground capable of creating serious doubt as to the legality of the permit: the neighbour must put forward at least one solid legal argument, for example a manifest breach of the rules on height, siting or massing in the local urban plan (plan local d'urbanisme).

If these two conditions are met, the judge in summary proceedings may suspend implementation of the permit within a few weeks, pending judgment on the merits. The site must then stop. Otherwise, the works continue.

Article L.600-3 of the French Town Planning Code nonetheless frames this application: it is admissible only until the expiry of the period set for crystallisation of grounds, that is, once the contentious debate has stabilised. The neighbour who wants to suspend the site must therefore act early, without waiting.

Take the owner of a detached house who sees the construction of a three-storey building start at the boundary of their plot. If they consider that the height authorised exceeds what the zone's rules permit, they will have an interest in immediately filing an appeal on the merits together with a summary suspension application, rather than waiting for the final judgment while the building rises.

The project owner's side: securing and clearing the permit

For the developer, the subdivider or the individual who is building, the objective is symmetrical: to reach as quickly as possible the clearing of the permit, that is, the moment when no further appeal or withdrawal is possible. A cleared permit is a secured asset, a condition often required by banks and by purchasers of property off plan (VEFA).

Impeccable display

The first precaution, the most elementary and yet the most neglected, is rigorous display. Since the time limit for third-party appeals runs only from a continuous, regular and complete display, any defect weakens the project.

The prudent project owner has their display recorded by a commissaire de justice on three occasions: on the first day, at the mid-point, then at the end of the two months. These reports establish the continuity and content of the display. In the event of a later challenge, they constitute evidence of the starting point of the period that is hard to contest. It is a modest investment compared with the risk of the period being deemed never to have started running.

The certificate of no appeal and no withdrawal

Once the two months have elapsed, how can one be certain that no appeal has been filed? Article R.600-7 of the French Town Planning Code allows the beneficiary of the permit to ask the registry of the administrative court for a certificate attesting that no contentious appeal has been registered against their authorisation.

This document, commonly called a certificate of no appeal (certificat de non-recours), is a key element of clearing the permit. Combined with proof of regular display and the expiry of the time limits, it allows the notary, the bank and the purchaser to establish that the permit is final. It is often a document required before the signing of a deed of sale or the release of financing. The interplay between this clearing and the promise relating to the land is analysed in our article on securing a land acquisition subject to a cleared building permit.

Withdrawal by the authorities

Third-party appeals are not the only threat hanging over the permit. The authorities may themselves withdraw it if they consider it unlawful. Article L.424-5 of the French Town Planning Code strictly frames this power: a building permit may be withdrawn only if it is unlawful and only within three months of the date of the decision. After this period, the permit can no longer be withdrawn by the authority, except at the express request of its beneficiary.

For the project owner, this three-month period overlaps with the two months for third-party appeals. Complete securing therefore requires both deadlines to be monitored. It is only when the time limit for third-party appeals has expired, no appeal has been notified and the period for administrative withdrawal has elapsed, that the permit can be regarded as definitively cleared.

The tools that clean up and speed up litigation

Town planning litigation has been profoundly reformed to combat abusive appeals and to give the court the means to save permits affected by a curable defect. These mechanisms concern the neighbour, who needs to know their limits, as much as the project owner, who finds in them levers of defence.

The crystallisation of grounds, provided for by Article R.600-5 of the French Town Planning Code, prevents the parties from raising new grounds after a period of two months from the communication of the first defence statement. The neighbour therefore cannot feed their appeal indefinitely with new arguments. This rule stabilises the debate and shortens proceedings.

Regularisation during the proceedings is the most powerful lever for the builder. Under Article L.600-5-1, where a defect affecting the permit is capable of being regularised, the court stays its decision and gives the beneficiary a period in which to produce an amending permit. Article L.600-5 also allows the court to pronounce only a partial annulment, limited to the defective part of the project. The project owner can thus avoid a total annulment for a correctable technical reason. The conditions of this mechanism are developed in our article on the amending permit and regularisation during proceedings.

Abusive appeals are penalised by Article L.600-7 of the French Town Planning Code: where an appeal has been brought in conditions reflecting abusive conduct and causing excessive harm to the beneficiary of the permit, the latter may ask the court to order the applicant to pay damages. This provision targets in particular appeals brought for the sole purpose of negotiating a withdrawal in return for financial consideration.

More precisely, Article L.600-8 requires registration with the tax authorities of any settlement by which an applicant withdraws their appeal in exchange for a sum of money or a benefit. Failing registration, the settlement is deemed to be without cause and the sums paid may be recovered. The neighbour who hoped to monetise their withdrawal must therefore appreciate that the law closely regulates such arrangements.

Finally, the time taken to give judgment has itself been accelerated in certain areas. Article R.600-6 requires the court to rule within ten months on appeals directed against permits authorising the construction of buildings comprising more than two dwellings, in areas where housing pressure is high. This acceleration benefits collective housing projects directly.

Conclusion

The balance of power between the neighbour who challenges and the project owner who builds is determined less by the merits of the case than by mastery of time limits and formalities. The neighbour has a period of two months from display on the land, which they can extend by an administrative appeal, but will really block the site only by obtaining a summary suspension, which requires acting quickly and having a serious ground. The project owner, for their part, secures their project through impeccable display, a record made by a commissaire de justice and a certificate of no appeal, while keeping in mind the three-month period for administrative withdrawal.

The stance is clear: in this litigation, whoever neglects procedure loses, whatever the strength of their arguments on the merits. An appeal that is badly notified is inadmissible, a defective display never clears the permit. Before bringing an appeal as before starting a site, have a real estate lawyer check the complete chain of time limits and formalities: it is at this level that most cases are won or lost.

Frequently asked questions

What is the time limit for a third-party appeal against a building permit? The time limit is two months from the first day of continuous display of the permit on the land, pursuant to Article R.600-2 of the French Town Planning Code. This starting point is not the date the permit was issued, but that of display on the land by a regulation sign. An administrative appeal made within this period extends it by a further two months from the rejection. More than six months after completion of the works, no appeal for annulment is admissible any longer (Article R.600-3).

Does an appeal against a building permit suspend the works? No. Article L.600-3 of the French Town Planning Code provides that a contentious appeal is not suspensive: the permit remains enforceable and the site may start. To block the works effectively, the third party must file a summary suspension application on the basis of Article L.521-1 of the French Code of Administrative Justice, showing urgency and serious doubt as to the legality of the permit.

How can a building permit be suspended in summary proceedings? An appeal on the merits for annulment must first have been filed, and then the judge in summary proceedings must be seized of a suspension application. Two cumulative conditions are required: urgency, often established by the start of a site that is difficult to reverse, and a ground capable of creating serious doubt as to the legality of the permit, for example a breach of the height or siting rules of the local urban plan. The judge generally rules within a few weeks.

What happens if the permit display sign is incomplete or missing? As long as display on the land is not regular, continuous and complete, the time limit for third-party appeals does not run. The permit is therefore never cleared and remains open to challenge, within the limit of six months following completion of the works. This is why the project owner has every interest in having their display recorded by a commissaire de justice on several occasions.

How can a project owner clear their building permit? Clearing requires several conditions to be met: regular display for two months, expiry of the time limit for third-party appeals with no appeal notified, and the lapse of the three-month period for administrative withdrawal provided for by Article L.424-5. The beneficiary may ask the registry of the administrative court for a certificate of no appeal (Article R.600-7), a document commonly required by notaries and banks before a sale or financing.

Can a neighbour be ordered to pay for an abusive appeal against a permit? Yes. Article L.600-7 of the French Town Planning Code allows the beneficiary of the permit to claim damages where the appeal was brought in conditions reflecting abusive conduct and causes them excessive harm. In addition, any settlement by which an applicant withdraws in return for consideration must be registered with the tax authorities (Article L.600-8), failing which it is deprived of effect.

Must an appeal be notified to the holder of the building permit? Yes, and it is a mandatory condition of admissibility. Article R.600-1 of the French Town Planning Code requires any appeal, administrative or contentious, to be notified to the author of the decision and to the holder of the permit by registered letter with acknowledgement of receipt, within fifteen clear days of filing the appeal. Failing this, the appeal is inadmissible, however serious the arguments put forward.