Abnormal neighbourhood disturbance and construction sites: who compensates neighbouring owners, and with what claim for indemnity

A major restructuring in a dense urban area, involving underpinning, full strip-out and added storeys, almost invariably runs into the same event: six weeks after the site opens, the neighbouring co-ownership association (syndicat des copropriétaires) brings summary proceedings (référé), produces a report recording cracking and seeks an expert appraisal together with an interim payment. For the project owner (maître d'ouvrage), the question is not whether it has committed a fault, since it generally has not, but how much it will have to pay out immediately, and how soon it can pass that cost on to the contractors and their insurers. Between the payment and the recovery, several financial years often go by. This analysis deals with the liability regime applicable since its codification in Article 1253 of the French Civil Code, with the mechanism of the interim payment obtained in summary proceedings by the neighbouring owner, and with the construction of the claim for indemnity against the builders, from the standpoint of an operation budget and a delivery schedule that must be met.

A stand-alone regime, now codified in Article 1253 of the French Civil Code

The abnormal neighbourhood disturbance (trouble anormal de voisinage) long rested on a purely case-law principle, formulated without an express statutory reference. Law No. 2024-346 of 15 April 2024 aimed at adapting the law of civil liability to current challenges, published in the Journal officiel of 16 April 2024, ended that singularity by creating Article 1253 of the French Civil Code.

The owner, the tenant, the occupier without title, the holder of a title whose main purpose is to authorise the occupation or use of land, the project owner or the person who exercises its powers, who is the source of a disturbance exceeding the normal inconveniences of neighbourhood, is strictly liable for the resulting damage.

There are three lessons here for a property operator. First, liability is strict (de plein droit): the neighbouring owner has no fault, contractual breach or infringement of a standard to demonstrate. It is enough to establish a disturbance, its abnormal nature, and a causal link with the site. Second, the text expressly names the project owner or the person who exercises its powers, which confirms the liability of the principal, including where it does not occupy the land and has no operational control over the works. Third, the exception for prior occupation set out in the second paragraph presupposes an activity that pre-dates the neighbour's arrival and is continued under unchanged conditions: a construction site, new and changing by definition, never falls within that scenario.

Two classic corollaries remain. Compliance of the project with planning rules does not exonerate: the building permit is issued without prejudice to the rights of third parties, and the fact that it has become final does not prevent a finding of liability. Likewise, compliance with prefectoral or municipal orders governing site noise, or with the requirements of Article R. 1334-36 of the French Public Health Code, does not neutralise the abnormal nature of the disturbance, whereas a breach of them establishes it almost automatically.

Abnormal nature: the criteria applied by the expert and by the court

Abnormality is assessed in concreto. The court reasons from a body of indicators, and the court-appointed expert structures the report along the same lines: intensity of the disturbance, duration and repetition, hours, pre-existing environment, and foreseeability having regard to the intended use of the premises.

A demolition operation in a Haussmann-style district is not judged by the standard of a site in a business park. But the greater tolerance accepted in a dense urban setting reaches its limit with duration: a site lasting eighteen to thirty-six months, with pile driving, concrete sawing, a constant flow of lorries and prolonged occupation of the public highway, crosses the threshold whatever precautions are taken. Practice usefully distinguishes two families of disturbance. First, physical damage: cracking of party-wall façades, differential settlement, damage to buried pipework, loosening of tiling, deformation of floors. Second, loss of enjoyment: noise, vibrations, dust, temporary loss of sunlight or view, obstructed access, scaffolding hiding a shop window.

This distinction is not academic. Physical damage lends itself to quantifiable reinstatement in kind, and therefore to a large and rapid interim payment. Loss of enjoyment is compensated by a monthly allowance, the basis of which grows with each month of delay on site.

Who is answerable for the disturbance: the project owner in the front line

The liability of the project owner in neighbourhood matters is now the front line. The neighbouring owner sues the project owner because it is identified on the permit sign, is solvent and insured, and because there is no fault to prove against it. The developer, the property company or the fund holding the asset therefore bear the first shock, even where the disturbance stems entirely from an execution method chosen by the structural works contractor.

The position of the occasional neighbour after codification

Before 2024, the case law had extended the duty to compensate to the builders themselves, characterised as occasional neighbours (voisins occasionnels): the main contractor, the architect and the design office could be ordered to pay the neighbouring owner directly, on the same strict-liability basis, leaving them to claim against one another. By contrast, it was already accepted that the subcontractor, who does not exercise the powers of the project owner and has no contractual link with it, falls outside that characterisation and answers to the third party only for its proven fault, in tort.

Article 1253 no longer refers to the occasional neighbour but only to the project owner and the person who exercises its powers. The exact scope of this wording is read in divergent ways in legal writing, and it would be unwise to announce that the notion has disappeared. Two operational consequences nonetheless apply from now on. On the one hand, the exposure of the project owner is certain, whereas that of the builders towards third parties is no longer so: the risk of remaining the sole final debtor increases. On the other hand, a claim for indemnity against the builders can no longer be built on the mere hope of a strict-liability basis. It must be secured by contract, before the contracts are signed.

The delegate and the agent

The wording the person who exercises its powers covers situations of delegation. A developer holding a property development contract (contrat de promotion immobilière), a project management agent, a tenant under a building lease (bail à construction) or a tenant carrying out major works in the leased premises may fall into this category. In investment structures where the project company holds the asset and delegates the running of the operation, both entities may be joined to the proceedings. The choice then turns on solvency and on the insurance cover actually taken out at the level of each entity, not on the organisation chart.

Who may bring a claim, and for what losses

Being a neighbour does not require adjoining land, but sufficient proximity to suffer the disturbance. The following may sue: the owner of the neighbouring land, the usufructuary, the tenant, including a commercial tenant, and the occupier. The co-ownership association acts for the common parts; each co-owner keeps the right of action for his or her own unit.

One procedural point deserves attention on the neighbouring co-ownership side: Article 55 of Decree No. 67-223 of 17 March 1967 in principle makes the action of the managing agent (syndic) subject to authorisation by the general meeting, but expressly exempts from that authorisation claims falling within the powers of the judge in summary proceedings. The neighbouring association may therefore bring summary proceedings for an expert appraisal and for an interim payment without waiting for the next meeting. The schedule of a construction site gets no respite on that side.

The landlord-tenant relationship calls for a point that is often overlooked. Where the disturbance comes from a site run by a third party, Article 1725 of the French Civil Code excludes the landlord's warranty for disturbances in fact caused by third parties: the commercial tenant brings the action itself against the neighbouring project owner and cannot claim a rent reduction from its landlord. The solution is reversed where the site is the landlord's own, in its own building: Article 1724 of the French Civil Code then requires the tenant to put up with the necessary works, but gives a right to a rent reduction where their duration exceeds twenty-one days.

The recoverable heads of loss are as follows:

• cost of making good physical damage, including temporary shoring and structural repair;
• loss of enjoyment suffered by occupiers, assessed per month and per unit, adjusted according to the exposure of the façade;
• loss of business suffered by the neighbouring trader, quantified as loss of gross margin and not as loss of turnover;
• letting vacancy and rent discounts granted to keep the tenant in place;
• costs of temporary rehousing, removal, cleaning and protection of stock;
• technical fees incurred by the victim to follow the expert appraisal operations.

For a neighbouring institutional landlord, the decisive item is the fourth. A site lasting three years next to an office building can jeopardise a re-letting, and therefore the value of the asset on exit. This loss can be documented, quantified and claimed.

The interim payment in summary proceedings: the real cash-flow shock

The budgetary axis of the operation is determined here. The neighbouring owner is not aiming, in the first instance, for a judgment on the merits three years down the line. It is aiming for a summary order within a few weeks.

The obligation that is not seriously disputable

Article 835, second paragraph, of the French Code of Civil Procedure authorises the president of the judicial court (tribunal judiciaire) to award an interim payment to the creditor where the existence of the obligation is not seriously disputable. Before the commercial court (tribunal de commerce), Article 873, second paragraph, gives the same power.

The regime of Article 1253 of the French Civil Code makes that threshold particularly easy to cross. Once the abnormal nature of the disturbance and the causal link emerge from a report by a commissaire de justice (bailiff), from an out-of-court expert report or, better still for the claimant, from a pre-report by a court-appointed expert, the project owner's challenge is often reduced to a discussion of quantum. But a discussion of quantum does not amount to a serious challenge on the principle: it leads the judge to award a cautious interim payment, not to dismiss the claim. On the conditions for an interim payment in summary proceedings and the effect of the order made, see our dedicated analysis of the claim that is not seriously disputable.

Two financial consequences must appear in any operation cash-flow plan. The summary order is provisionally enforceable as of right, and an appeal does not suspend it: the interim payment must be paid out, even if the project owner challenges it. And the interim payment is not a ceiling: the neighbouring owner may seek further sums as the appraisal proceeds, each worsening of the disturbance justifying a further application.

Stoppage of the site and protective measures

The first paragraph of Article 835 of the French Code of Civil Procedure is the heaviest risk, because it is measured not in euros but in weeks. It allows the judge in summary proceedings to prescribe the protective or restorative measures needed to prevent imminent damage or to put an end to a manifestly unlawful disturbance. In the case of a construction site, this covers an order to shore up a party wall, restrictions on hours and on noisy methods, an obligation to sheet and water down, the installation of topographic monitoring and, in extreme cases where the stability of a neighbouring building is at stake, suspension of the works until a validated calculation note is produced.

A site stoppage of a few weeks results in crane standing time, late-delivery penalties, a delay in handover, additional carrying costs and, for a financed operation, pressure on covenants and on the refinancing date. The indirect cost frequently exceeds that of the interim payment.

The interplay with the preventive summary procedure under Article 145 of the Code of Civil Procedure

The preventive summary procedure (référé préventif), sought on the basis of Article 145 of the French Code of Civil Procedure before any works begin, is the tool for anticipating this dispute. It makes it possible to have an expert appointed with a two-stage assignment: an adversarial record of the condition of neighbouring properties before the works, then monitoring of the site with periodic visits and the option of referral if damage appears. The scope of the neighbouring owners to be joined and the construction of the expert's assignment are examined in our article on the preventive summary procedure before works.

Its value is twofold. It fixes the initial condition, which deprives the neighbouring owner of the argument that pre-existing cracking is attributable to the site, and it shifts the debate to the actual worsening. It then sets up an adversarial framework that includes from the outset the contractors, the project manager (maître d'œuvre), the design office and their insurers, which determines the effectiveness of the later claim for indemnity. A project owner that has carried out a complete preventive summary procedure does not avoid the interim payment, but it can usefully discuss its amount and, above all, it immediately has a technical file that can be relied on against its builders.

The recurring mistake is to limit the joinder to the immediately adjoining neighbours alone. The scope must be calibrated on the geotechnical study and on the nature of the works: underpinning with groundwater lowering produces settlement effects well beyond the immediate party wall.

Building the claim for indemnity against the builders

A project owner ordered to compensate the neighbouring owner is not meant to bear the final burden. But the claim must have been prepared before the first writ.

The two available bases

The first basis is contractual. The project owner sues the contractors under Article 1231-1 of the French Civil Code, by demonstrating a breach: unsuitable execution method, absence of shoring, vibration thresholds exceeded, inadequate geotechnical study having regard to the assignment ordered under standard NF P 94-500, failure of the project manager to warn in breach of its duty of advice. This basis therefore requires proof of fault, which the court-appointed expert appraisal can generally establish, but at the price of a long technical debate.

The second basis is subrogation. The case law prior to the 2024 law accepted that the project owner who has compensated the neighbouring owner is subrogated to the victim's rights and may sue the builders at the origin of the disturbance without demonstrating their fault, the final contribution to the debt then being apportioned in proportion to the respective breaches. Whether this mechanism survives the new wording of Article 1253 is debated. Until the question is settled, it is unreasonable to build the economics of an operation on this lever alone.

Lastly, the subcontractor answers to the project owner only in tort, with proof of fault required. On a site where most of the sensitive work, special foundations, earthworks and sawing, is subcontracted, this must be taken into account from the drafting of the main contractor's contract.

What insurance covers, and what it does not cover

A first clarification: construction damage insurance (assurance dommages-ouvrage) and the ten-year warranty (garantie décennale) do not apply. The regime of Articles 1792 et seq. of the French Civil Code protects the project owner and successive purchasers, not neighbouring third parties. The neighbouring owner has no right of action on that basis, and the project owner cannot call on its construction damage policy to fund an interim payment made to a neighbour.

There are three policies that are genuinely useful. General third-party liability of contractors and project managers covers damage caused to third parties by the site, subject to express extensions for underpinning, special foundations and deep earthworks, extensions that are frequently missing from standard contracts. The contractors' all-risks policy covers the works in progress and, by negotiated extension, existing structures and neighbouring properties. The project owner's third-party liability, taken out project by project, is the tool designed directly for abnormal neighbourhood disturbance. The interplay between the contractors' all-risks policy, construction damage insurance and the ten-year warranty is dealt with separately in our article on contractors' all-risks insurance.

The friction points are well known and should be audited before the contracts are finalised:

• the exclusion of damage that is inevitable or foreseeable, which is the most dangerous exclusion on a site where the geotechnical study forecast settlement;
• the treatment of non-consequential intangible damage, which is precisely what covers the neighbouring trader's loss of business;
• the sub-limits per claim and per year, often unrelated to the value of the adjoining buildings in a central district;
• the excess, which remains with the project owner and can absorb most of an interim payment ordered in summary proceedings.

Locking down the contracts upstream

The works contract and the project management contract are the two documents that determine the final burden. A clause placing neighbourhood disturbances on the contractor is perfectly valid between the parties, but it remains unenforceable against the neighbouring owner: it organises the claim over, it does not avoid the initial payment.

The provisions to require follow a simple logic: an obligation to take out and maintain third-party liability cover with extensions suited to the nature of the works, annual production of certificates expressly stating the declared activities, an undertaking to take part in preventive appraisal operations and to carry out at its own cost the protective measures prescribed, a retention or on-demand guarantee tied to the risk to neighbouring properties, and assumption of the additional costs of a stoppage ordered in summary proceedings. For private contracts governed by standard NF P 03-001, as for public contracts subject to the CCAG Travaux (general administrative specifications for works contracts) resulting from the order of 30 March 2021, the provisions on damage caused to third parties must be read, and where appropriate expressly derogated from, rather than adopted by blanket cross-reference.

Decision timetable and limitation

The neighbouring owner's action is a personal action for compensation subject to the five-year limitation period of Article 2224 of the French Civil Code, and not to the thirty-year period for real actions relating to land. Time runs from the day the victim knew or should have known the facts enabling it to act. For a continuing disturbance, that starting point renews itself for as long as the disturbance persists, which considerably reduces the defensive value of limitation on a long site.

The chronology to be followed on the project owner's side is organised in four sequences. Before the works order, a preventive summary procedure and a record of the condition of the premises over a perimeter calibrated by the geotechnical study, contracts locked down and insurance certificates checked line by line. During the works, instrumentation and topographic monitoring with written alert thresholds, a time-stamped site diary, and prompt amicable handling of the first complaints, which always costs less than a court-appointed expert appraisal. From the first serious claim, immediate joinder of all participants and their insurers, so that the appraisal is binding on them. After an interim payment has been made, bringing the claim over without delay, bearing in mind that a writ in summary proceedings for an expert appraisal interrupts limitation within the meaning of Article 2241 of the French Civil Code and that time is suspended during the investigative measure under Article 2239.

Conclusion

The abnormal neighbourhood disturbance caused by a construction site is not one legal risk among others, it is a budget line. The codification effected by the law of 15 April 2024 has strengthened the position of the neighbouring owner and designated the project owner as strictly liable debtor, while weakening the certainty of the strict-liability claim against the builders. The equation has shifted: payment out is faster and more predictable, recovery is less so.

The operational consequence is clear. On a major restructuring in a dense urban setting, the neighbouring-properties item must appear in the financial budget of the operation from financial close, with a cash provision calibrated on the scenario of an interim payment in summary proceedings and a site stoppage of a few weeks, and not treated as a residual risk covered by insurance. Before any works order, two checks are required: have the insurance certificates of each participant audited by independent counsel as to the activities actually carried out, including underpinning extensions, and have a preventive summary procedure ordered whose perimeter of neighbouring properties is fixed on the basis of the geotechnical study, and not on cadastral contiguity alone.

Frequently asked questions

Can the project owner escape liability by proving that it has committed no fault? No. Article 1253 of the French Civil Code, resulting from Law No. 2024-346 of 15 April 2024, establishes strict liability: absence of fault, full compliance with good practice and conformity with the conditions of the building permit are not grounds for exoneration. Only force majeure, the victim's own act or the absence of an abnormal disturbance may usefully be raised. The exception for prior occupation provided for in the second paragraph of the text does not apply to a construction site, which is by nature a new activity.

Does a final building permit protect against a claim for abnormal neighbourhood disturbance? No. Planning consent is issued without prejudice to the rights of third parties and does not extinguish any civil liability. A project that fully complies with the local urban plan, whose permit has become final for want of a challenge, may give rise to liability if the site or the completed building generates a disturbance exceeding the normal inconveniences of neighbourhood. The ordinary courts remain competent to assess it, regardless of the administrative lawfulness of the permit.

How long does it take for a neighbour to obtain an interim payment in summary proceedings? Summary proceedings before the president of the judicial court take a few weeks, the timing depending on the court and the urgency found. On the basis of Article 835, second paragraph, of the French Code of Civil Procedure, an interim payment requires an obligation that is not seriously disputable, a condition that strict liability makes easy to meet once a report or an expert pre-report establishes the link with the site. The order is provisionally enforceable and an appeal is not suspensive: the sum must be paid even if it is challenged.

Does construction damage insurance cover damage caused to neighbouring buildings? No. The warranties of Articles 1792 et seq. of the French Civil Code, and the construction damage policy that pre-finances them, benefit the project owner and successive purchasers, not neighbouring third parties. Damage to neighbouring properties falls under the third-party liability of the participants, the contractors' all-risks policy with an extension for existing structures and neighbouring properties, or a project owner's third-party liability policy taken out for the operation. Checking the extensions relating to underpinning works and special foundations is decisive.

Can the project owner claim against the contractors without proving their fault? A contractual claim based on Article 1231-1 of the French Civil Code requires a breach by the contractor, the project manager or the design office to be demonstrated. The case law prior to the 2024 law also accepted a subrogated claim making it possible to act without proof of fault against the builders at the origin of the disturbance, but the new wording of Article 1253 of the French Civil Code, which no longer expressly refers to the builder, makes this route less certain. In practice, the claim for indemnity against the builders must be secured by explicit contractual provisions in the contracts, and not presumed to be available.

Can a neighbouring commercial tenant bring a claim, and against whom? Yes. Article 1253 of the French Civil Code expressly refers to the tenant and the occupier among the persons protected, and being a neighbour does not require adjoining land. The commercial tenant sues the project owner of the site directly and claims its loss of gross margin, documented by a certificate from a chartered accountant. It cannot, however, claim a rent reduction from its own landlord, since Article 1725 of the French Civil Code excludes the landlord's warranty for disturbances in fact caused by third parties.

Within what period does the neighbour's action become time-barred? An action for compensation for abnormal neighbourhood disturbance is a personal action subject to the five-year period of Article 2224 of the French Civil Code, which runs from the day the victim knew or should have known the facts enabling it to act. Where the disturbance is continuing, that starting point renews itself for as long as the disturbance persists, which greatly limits the force of a limitation defence on a long-running site. A writ in summary proceedings for an expert appraisal interrupts the period and the investigative measure suspends it until the report is filed.