A buyer acquires a former industrial site to build housing, which requires more thorough decontamination than the former operator’s restoration. Can the buyer recover the cost from that operator? No, held the Cour de cassation (the French supreme court for civil and commercial matters) on 29 June 2022, in a reported decision, if the last operator restored the site for the future use determined with the mayor: for the valuer, that extra cost then weighs on value. The time limit for a hidden defect (vice caché) claim runs from knowledge of the extent of the pollution, not of its cost.
The facts
A company ran a paint and industrial soap manufacturing business in its buildings, subject to the rules on installations classées (regulated industrial installations), then sold that business (fonds de commerce). Given formal notice by the prefect, on 17 July 2008, to submit its proposal for the future use of the site, it obtained on 5 October 2009 a building permit for the refurbishment of the existing buildings only, for essentially office, workshop and storage use. On 16 November 2009, the prefecture notified it that the site was considered to have been made safe.
On 28 February 2011, it sold the buildings to three companies, undertaking to bear, if decontamination was needed, the costs above €200,000. On 31 May 2011, a detailed pollution survey was drawn up at the request of the manager of an SCI (société civile immobilière, a French property-holding company) considering the purchase, which in June 2011 applied for a permit to demolish the existing buildings and construct eighty-four flats, sixteen residential units and four offices. A new planning scheme having made exclusive residential use of the area possible, the three companies resold the property to the SCI by notarial deed of 4 August 2011.
The SCI sued the former operator for refusing to decontaminate; on 22 September 2014, it sued its sellers for failing to deliver a property matching the contract (délivrance conforme) and under the hidden defects warranty. On 2 April 2021, the Paris Court of Appeal rejected the claims against the former operator and declared inadmissible those based on hidden defects.
The decision
The Third Civil Chamber dismissed the appeal (Cass. 3e civ., 29 June 2022, appeal no. 21-17.502, reported).
The cost of decontamination. Under article L. 512-17 of the Environmental Code (Code de l’environnement) then in force, the last operator of a regulated installation permanently shut down must restore the site for a future use determined in accordance with the regulations. But, the Court recalled, under article R. 512-39-4, “in the event of a later change in the use of the site, the operator cannot be required to take additional measures induced by that new use, unless it is itself the initiator of that change of use” (translated from the French, as are the quotations below). It concluded that, “if the last operator has fulfilled the restoration obligation incumbent on it, with regard both to article L. 511-1 of the Environmental Code and to the future use of the site defined in accordance with the regulations in force, in this case a use determined with the mayor of the municipality, the additional decontamination cost resulting from a change of use by the buyer is borne by the latter”.
The SCI’s project differed from the one covered by the 2009 permit, to which the €200,000 clause applied, and the site had been considered made safe: according to the Court, the Court of Appeal correctly deduced that no breach of the former operator’s statutory restoration obligations had been shown and that “the rehabilitation of the site had been made necessary by the change of use carried out by the SCI”.
The hidden defect time limit. The SCI objected that the survey did not allow the cost of the works to be assessed. But the Court of Appeal found, in its unreviewable assessment of the facts, that the survey of 31 May 2011, drawn up before the sale, “had revealed the extent of the pollution with regard to the new use that the prospective buyer wished to give to the premises”. The action brought on 22 September 2014 was therefore inadmissible, “since knowledge of the defect is not conditional on knowledge of the cost of the works needed to remedy it”.
What this changes for valuation
Decontamination for the intended use is a cost of the scheme. An industrial site intended for housing is often valued by the residual method (bilan promoteur): value of the completed scheme, less construction and development costs and the developer’s margin (Charte de l’expertise en évaluation immobilière, the French property valuation charter, 6th edition, November 2025, Title III, § 2.8). The decontamination that residential use requires is one of those costs; since in that case it cannot be shifted to the last operator, it reduces the land value for development (charge foncière) the buyer can afford. A price computed as if the soil were already fit for housing overstates the land.
Two levels of restoration, two debtors. The report separates what fell to the last operator, against the use defined with the mayor, from the extra required by the new use. It relies on the administrative documents and an environmental consultancy’s costings, since the Charter excludes soil pollution surveys from property valuation (Title II, chapter 10). A clause covering costs is read with the use it refers to: the Court of Appeal linked the €200,000 clause to the 2009 permit. Lastly, the rule assumes that the operator has fulfilled its obligation and did not initiate the change; outside those cases, the decision does not say who pays.
Time runs once the extent of the pollution is known. A survey that reveals its extent makes the defect known, even if the cost is priced later. The decision of 8 January 2026, under which time ran from the expert report that revealed the cause of an insulation defect, points the same way (time runs from the expert’s report). That of 26 March 2026 has since confirmed that it is a limitation period, suspended during a court-ordered appraisal granted before any trial, without changing its starting point (a court appraisal suspends the two-year limit). The valuer therefore notes the dates of the surveys. The legal basis, hidden defect or delivery, depends on what the deed says about the soil (polluted, unbuildable land).
A neighbouring question, not to be confused. Public utility easements burdening polluted land, a separate point decided on 14 December 2022, are compensated according to the use possible one year before the owners were consulted (easements on polluted land).
What the valuer takes from it
- A last operator that restored the site for the use defined with the mayor does not bear the extra decontamination of a change of use the buyer wants.
- In the residual method, that decontamination is deducted from value; it is not recoverable from a former operator that fulfilled its obligation.
- The report separates the restoration owed by the operator from the extra linked to the new use, and reads any cost-sharing clause with the use it refers to.
- The hidden defect time limit runs from knowledge of the extent of the pollution, not of its cost.
Further reading
The Property loss of value page describes the assignment, its timescale and its fee. The guide I paid too much: can I challenge the price? and the glossary entries vice caché, bilan promoteur and charge foncière complement this article. On easements burdening polluted land: Easements on polluted land: compensation follows the possible use. On the same theme: Claiming loss of enjoyment and devaluation of a French home and Common parts sold for €1: the French co-owners had to act sooner. The decision is available on Légifrance.
What next
A former industrial site to convert, and a decontamination cost weighing on its value?
I value the site for the intended use, taking in the decontamination cost assessed for that use by an environmental consultancy, and I separate what fell to the last operator from what remains with the buyer. The report serves the buyer, the seller or their lawyer.
Free quote, by email or by phone. No commitment before the quote is accepted. Fees are never linked to the value of the property (Charte de l’expertise, Title I, §2.1).
