You have found the flat in Paris, agreed the price with the seller, and signed the compromis de vente (preliminary sale agreement). Then your notaire (notary) tells you the file is frozen: the town hall has been notified and has two months to decide whether it will buy the property instead of you. For a foreign buyer who has scheduled movers, currency transfers, and a loan offer with an expiry date, this moment feels like the deal collapsing. It is not. It is the droit de préemption urbain (urban pre-emption right, known as DPU), a routine step in thousands of French conveyances every year, and one that a prepared buyer can manage calmly. This guide explains which sales are caught, how the two-month clock works in practice, what happens when the town hall disputes the price, and which remedies exist when a pre-emption goes wrong.
I. The mechanism: the DIA declaration and the two-month freeze
French urban pre-emption allows a public authority to step into the shoes of the buyer named in a planned sale and acquire the property on the agreed terms, or on terms fixed by a judge. The policy behind it is public, not punitive: pre-emption exists so that communes can assemble the land they need for housing, facilities, and regulated development. Understanding this purpose helps foreign buyers read the procedure for what it is, a land-policy instrument with strict formalities, rather than an arbitrary veto on their purchase.
A. Which sales are caught and how the town hall is notified
The DPU is created locally. Communes equipped with an approved local planning document may, by council decision, establish an urban pre-emption right over all or part of their urban and future-development zones. The statutory basis is Article L. 211-1 of the Code de l’urbanisme (Planning Code), and the aims it may serve are those of the general interest defined for planning operations, including the building of land reserves for future development, under Article L. 210-1 of the Code de l’urbanisme. In plain English: where the commune has drawn a pre-emption perimeter on its planning map, qualifying sales inside that perimeter must be offered to the public authority first.
The net is cast wide. Under Article L. 213-1 of the Code de l’urbanisme, the right covers any building or bundle of rights giving a right to the attribution of a building or part of a building, sold for consideration in any form, as well as sales of undivided shares except between co-owners, and sales transferring majority control of a société civile immobilière (non-trading property company, known as SCI) whose assets consist of a single land unit subject to pre-emption, other than family SCIs formed exclusively between relatives up to the fourth degree. A Paris apartment sold by its owner, a subdivided house, or the shares of an SCI holding one Paris building therefore all sit squarely inside the perimeter. Foreign buyers using an SCI should note this carefully: acquiring control of the SCI is treated like acquiring the building itself.
The notification that starts the clock is the déclaration d’intention d’aliéner (declaration of intent to sell, known as the DIA), governed by Article L. 213-2 of the Code de l’urbanisme. The rule is strict: “Toute aliénation visée à l’article L. 213-1 est subordonnée, à peine de nullité, à une déclaration préalable faite par le propriétaire à la mairie de la commune où se trouve situé le bien.” In English, every covered sale must first be declared to the town hall of the commune where the property sits, on pain of nullity of the sale. The declaration states the price and conditions of the planned disposal and may now be filed electronically. Within the two-month period, the authority may also send one single request for documents allowing it to assess the consistency and condition of the building, from a closed list fixed by decree, which means it cannot spin the process out with repeated demands for paperwork.
Two boundary points deserve emphasis because they trap foreign buyers. First, the family SCI exception is narrow: only companies formed exclusively between relatives and in-laws up to the fourth degree escape the majority-share rule, so an SCI shared with friends, business partners, or a non-relative spouse structure remains fully caught. Second, transfers by auction are not exempt; the DIA must then state the property’s valuation or starting price instead of an agreed sale price, and the authority may still pre-empt at the auction terms. Off-market deals between non-residents sometimes circulate with the idea that a share deal avoids the town hall; where the company holds a single Paris building, that idea is simply wrong, and the resulting sale carries the nullity risk described below.
In practice, the DIA is prepared and sent by the seller’s notaire immediately after the compromis de vente is signed, and the buyer’s two months of waiting run from receipt of a complete declaration. Silence at the end of the period means the authority has waived its right and the sale may proceed, a point confirmed by the notariat (notarial profession) in its public guidance updated in September 2026, which states that the municipality has two months to say whether it wishes to acquire the property on the seller’s terms. Buyers should therefore diary the expiry date themselves and ask their notaire for written confirmation of the waiver before releasing funds or giving notice on rented accommodation. For context on how French conveyancing dovetails with these purges, our Paris real estate team describes each step of a foreign buyer’s purchase in France, from preliminary agreement to completion.
B. Paris practice: where the clock runs and what the notaire does
Paris applies the DPU actively across virtually all of its urban zones, so a foreign buyer in the capital should treat the DIA purge as systematic rather than exceptional. The declaration goes to the Paris urban planning services, and the decision is taken by the municipal council unless delegated to the mayor. One Paris-specific point matters for timing: where a prefectural order designates a commune as failing its social-housing obligations, the State representative in the département (county) exercises the pre-emption right instead of the mayor for housing-affected property. Paris buyers occasionally discover that the decision-maker is the State rather than the City, which changes the contact point but not the two-month framework.
The standard compromis de vente anticipates this freeze through a planning clearance condition. Under French contract law, “La promesse de vente vaut vente, lorsqu’il y a consentement réciproque des deux parties sur la chose et sur le prix.” In English, a promise of sale counts as a sale once both sides agree on the thing and the price, which is why the preliminary agreement itself contains suspensive conditions, including the town hall’s waiver or the expiry of its two-month period without pre-empting. The reference is Article 1589 of the Code civil (Civil Code). Concretely, neither side can force completion while the DIA period is running, and if the town hall pre-empts, the buyer’s agreement lapses rather than binding anyone to an impossible sale.
Foreign buyers should use the waiting period productively instead of passively. First, keep the mortgage offer alive: French loan offers expire, and a two-month DIA delay can push completion past the offer’s validity, so the buyer should negotiate an offer duration that absorbs the purge. Second, track currency exposure, because the price is fixed in euros while the buyer’s funds sit in dollars, pounds, or francs. Third, ask the notaire to confirm in writing the exact date the complete DIA was received, since only a complete declaration starts the two months, and an incomplete filing followed by a document request can shift the calendar. None of these steps requires litigation; they are file hygiene, and they convert an anxious wait into a controlled timetable.
There is one more Paris timing trap worth naming. Loan offers governed by consumer-credit rules have a minimum reflection period and a maximum acceptance window, and sellers often press for completion dates that ignore the DIA freeze. A buyer who signs a compromis de vente promising completion thirty days after signature, while the town hall still holds two months to answer, has promised the impossible. The completion clause should therefore be drafted as a number of days running from the purge of all pre-emption rights, not from signature, and the financing plan should assume that the euros will be purchased or hedged across that full window. These are drafting points for the buyer’s notaire and counsel at the preliminary-agreement stage, when they cost nothing, rather than rescue points at completion stage, when they cost leverage.
II. Price disputes and remedies when pre-emption goes wrong
Most DIA files end quietly with a waiver. A minority produce three kinds of conflict that foreign buyers must understand in advance: the town hall offers a lower price, the pre-emption decision itself is unlawful and must be annulled, or the DIA was skipped altogether and the sale is exposed to nullity. Each has its own procedure, its own judge, and its own deadline, and confusing them is the costliest mistake a buyer can make.
A. The town hall challenges the price: negotiation and the expropriation judge
Pre-empting at the declared price is only one option. The authority may instead make a lower offer, opening a negotiation within the procedure. If no agreement is reached, the statute sends the parties to the judge who normally handles compulsory purchase: “A défaut d’accord amiable, le prix d’acquisition est fixé par la juridiction compétente en matière d’expropriation ; ce prix est exclusif de toute indemnité accessoire, et notamment de l’indemnité de réemploi.” In English, without an amicable agreement the acquisition price is fixed by the expropriation court, with no accessory compensation such as reinvestment costs. The reference is Article L. 213-4 of the Code de l’urbanisme. For the seller, this means the hoped-for price can be cut to a judicial valuation; for the evicted buyer, it means the property may change hands at a figure far below the deal they struck.
A recent ruling of the Third Civil Chamber of the Court of Cassation shows how unsentimental that valuation is. On 3 April 2025, in case number 23-23.206 concerning a co-owned lot inside a deferred development zone, the Court held that the price of the pre-empted property, fixed according to its condition on the date of the first-instance judgment, takes into account the state of both the private areas and the common areas, even where the deterioration of the common areas results from the halt of all renovation and maintenance work after the creation of the development zone. The official summary states that “Il en résulte que le prix du bien préempté, qui doit être fixé d’après sa consistance au jour du jugement de première instance, prend en compte, s’agissant de biens situés dans un immeuble en copropriété, l’état des parties privatives et des parties communes, même si la dégradation de ces dernières résulte de l’arrêt de tous travaux de rénovation et d’entretien après la création de la zone d’aménagement différé”, meaning the seller bears the depreciation even when the public freeze caused it. The full decision is published at Cour de cassation, Third Civil Chamber, 3 April 2025, no. 23-23.206. Foreign buyers should draw the practical lesson: a property inside a public development perimeter may be worth less than the agreed price by the time a judge values it, and the seller, not the buyer, absorbs that gap.
Crucially, judicial price-fixing does not force anyone to transact. Under Article L. 213-7 of the Code de l’urbanisme, “En cas de fixation judiciaire du prix, et pendant un délai de deux mois après que la décision juridictionnelle est devenue définitive, les parties peuvent accepter le prix fixé par la juridiction ou renoncer à la mutation.” In English, once the court’s price becomes final, each side has two months to accept it or walk away from the transfer. Silence during that period counts as acceptance, and ownership then passes to the pre-empting authority at the judicial price. A foreign buyer cannot be compelled to buy at a price they never agreed, since they are not a party to the price-fixing, but they should understand that the seller may accept a reduced judicial price and complete with the town hall, ending the buyer’s hopes. The buyer’s protection at that stage lies in the preliminary agreement: a well-drafted compromis de vente ties the release of the deposit to the outcome of the purge, so the evicted buyer recovers their funds instead of financing a dispute that is no longer theirs.
B. The evicted buyer fights back: annulment, priority buy-back and nullity
When the pre-emption decision itself is unlawful, because it lacks a genuine public-interest justification, was taken by an authority without power, or breaches procedural rules, the evicted buyer is not without recourse. The challenge goes to the administrative court, which alone may annul the pre-emption decision. If the transfer has already occurred, annulment triggers a statutory buy-back chain under Article L. 213-11-1 of the Code de l’urbanisme: the authority must first offer the property back to the former owners, and where they have expressly or tacitly renounced, it must then offer it to the person who had intended to acquire it, that is, the evicted buyer. The statute phrases the second step as follows: “le titulaire du droit de préemption propose également l’acquisition à la personne qui avait l’intention d’acquérir le bien”, meaning the holder of the pre-emption right must also offer the acquisition to the person who had intended to acquire the property. The price aims to restore the conditions of the blocked transaction without unjust enrichment of either side, and the former owner has three months from notification of the final court decision to accept before being deemed to have renounced.
The Court of Cassation enforces this chain strictly. On 7 September 2022, in case number 21-12.114, where a commune had pre-empted an industrial site and the evicted intended buyer then signed its own promise with the commune under this very procedure, the Third Civil Chamber held that the intended buyer “n’était plus fondée à réclamer l’exécution de la promesse de vente portant sur ce même immeuble”, meaning it could no longer demand performance of the earlier promise of sale for the same building granted by the original owner. In English, once the statutory buy-back track is engaged, the old private promise falls away and the statutory route governs. The decision is published at Cour de cassation, Third Civil Chamber, 7 September 2022, no. 21-12.114. For a foreign buyer, the message is twofold: an unlawful pre-emption can genuinely be undone, but the remedy runs through the administrative annulment first and the statutory offer second, never through direct enforcement of the original compromis against the seller.
A separate sanction protects the market where the DIA was skipped entirely. Because the declaration is required on pain of nullity, a sale completed without purging the pre-emption right can be annulled at the request of the authority, and the nullity action belongs to both the seller and the evicted buyer. The Court of Cassation confirmed this standing in a pre-emption case on 14 December 2023, number 22-11.505, recalling that “L’action en nullité appartient au propriétaire vendeur et à l’acquéreur évincé lors de la préemption”, meaning the nullity action belongs to the vendor owner and to the buyer evicted by the pre-emption. The decision is published at Cour de cassation, Third Civil Chamber, 14 December 2023, no. 22-11.505. That case concerned a rural land agency, but the standing principle and the prescription analysis apply across pre-emption regimes: nullity actions are personal actions governed by Article 2224 of the Code civil, under which “Les actions personnelles ou mobilières se prescrivent par cinq ans à compter du jour où le titulaire d’un droit a connu ou aurait dû connaître les faits lui permettant de l’exercer”, meaning personal actions are time-barred after five years running from the day the holder knew or should have known the facts allowing them to sue.
Two practical consequences follow. First, a buyer who suspects the seller never filed the DIA should obtain the planning record from the town hall before completion, because the buyer’s own notaire files the DIA as a matter of routine and an absent filing usually signals an off-market arrangement that should not proceed. Second, where the authority sits on a pre-empted property without using it for a qualifying public purpose, the statute imposes a loyalty duty: under Article L. 213-11 of the Code de l’urbanisme, property acquired by pre-emption must be used or transferred for one of the statutory public purposes, and if within five years the authority decides to use or sell it for other purposes, it must inform the former owners and offer them the property back in priority, since “il doit informer de sa décision les anciens propriétaires ou leurs ayants cause universels ou à titre universel et leur proposer l’acquisition de ce bien en priorité”, meaning it must notify the former owners and offer them priority acquisition. A buyer evicted in favour of a project that never materialises should therefore monitor the property and the deliberations of the council, because the five-year window can reopen the file. Throughout these disputes, proceedings run in French before French courts with strict time limits, which is why evicted foreign buyers typically instruct local counsel early; our Paris real estate litigation practice assists international owners before the administrative and civil courts when a pre-emption is disputed.
Conclusion
The town hall’s pre-emption right is not a reason to abandon a French purchase; it is a timetable to manage. The DIA declaration and its two-month period are predictable, the three possible answers of the authority are known in advance, and the price-fixing and annulment procedures follow written rules with published case law. A foreign buyer who diaries the purge, keeps financing alive through the freeze, conditions the preliminary agreement on the outcome, and reacts within the short deadlines for challenge or buy-back converts an apparent deal-breaker into an ordinary conveyancing step. Paris files move quickly and the authorities pre-empt selectively, so preparation, not haste, decides whether the buyer keeps the flat or watches the town hall take it.