Expropriation : the Court of Cassation Censures the Deduction for Partial Immobilisation

Imagine: you own a plot of land in Corte, with a beautiful sea view, classified as building land in the local urban plan. One day, the local authority announces that a motorway will pass a few metres from your home. Your land is partially expropriated. You are offered compensation. But surprise: the experts apply a 30% deduction because the land is allegedly 'immobilised' by noise pollution. How is this possible if your land is officially building land?

This question is asked by hundreds of owners every year. And for good reason: expropriation law is a fragile balance between the general interest and fair compensation for the owner. But what can you do when the administration or the lower court seems to ignore the rules?

The decision of the Court of Cassation of 15 June 1976 (no. 75-70.215) provides a clear answer: once a plot of land is recognised as 'building land', a deduction for 'partial immobilisation' cannot be applied without specifying concretely what the building possibilities were at the reference date. In other words, no heavy cut in compensation without precise justification. Let us analyse this decision.

The facts: a story that happens every day

Mr X. owned a plot of land in Grosseto-Prugna, in Corsica-du-Sud, a commune where building land is rare and sought after. His land, of 2,500 m², was located in zone UB of the land use plan, in other words building land with a floor area ratio (FAR) of 0.3. It had all the assets to be valued.

But a motorway project was nearby. The administration declared the public utility of the works and expropriated part of the land (about 800 m²). To fix the compensation, the expropriation commission (the first instance judge) considered that the land was indeed building land. So far, so good.

On appeal, the Bastia Court of Appeal confirmed the classification as building land. But it then applied a 20% deduction on the value of the land due to its 'partial immobilisation', linked to the proximity of the motorway and noise pollution. In its view, this nuisance depreciated the land, even though it remained building land.

Mr X. did not accept this decision. He appealed to the Court of Cassation. His argument: if the land is building land, the deduction for nuisances cannot be automatic; it must be demonstrated that the building possibilities were actually reduced at the reference date (the date of the expropriation judgment).

The reasoning of the court — analysed

The Court of Cassation (Civil Chamber, Expropriation Section) quashed the judgment of the Court of Appeal. Its reasoning is essential to understand the limits of compensation.

The legal basis is not a specific article of the code, but a general principle of expropriation law: compensation must cover the entire direct, material and certain loss caused by the expropriation (Article L. 321-1 of the Expropriation Code). This principle requires that the valuation be made at the reference date, i.e. the day on which the judge rules, taking into account the actual composition of the property and its legal situation.

The Court reminds that the classification of 'building land' entails precise consequences: the land must be valued according to its buildability, i.e. the number of square metres of floor space authorised by the local urban plan (PLU) at the reference date. However, the Court of Appeal had recognised that the land was building land, but had applied a flat-rate deduction of 20% without verifying whether, at the reference date, the building possibilities were actually reduced by the proximity of the motorway.

In other words, the lower court judges did not explain how the noise pollution concretely limited the right to build. Was it possible to build a house of 200 m² instead of 300 m²? Did larger setback margins have to be respected? The Court of Appeal said nothing of the sort. Consequently, the Court of Cassation considered that the decision lacked a legal basis (i.e. it was not sufficiently reasoned in law).

This decision is neither an evolution nor a reversal: it confirms consistent case law according to which the deduction for nuisances must be justified by a real impact on the building possibilities, and not by a mere subjective inconvenience.

What this changes for you — concretely

If you are the owner of building land that suffers from nuisances (motorway, high-voltage line, etc.), this decision is a powerful weapon. It protects you against arbitrary valuations that would reduce your compensation without proof.

For an owner-landlord in Corte: If your land is expropriated for an infrastructure project, the administration cannot apply a flat-rate deduction of 15 or 20% by invoking nuisances. It must demonstrate, for example, that the PLU imposes a setback of 10 metres from the motorway, which reduces the building area by 100 m². Without such demonstration, the deduction is illegal.

For a purchaser in Grosseto-Prugna: Before buying land near a noisy road, check the PLU and easements. If the land is building land but nuisances exist, you can negotiate the price downwards. But beware: if the administration expropriates one day, it cannot use these nuisances to reduce the compensation, unless it proves a reduction in building rights.

For a co-owner: If your co-ownership unit is located in a building near a future infrastructure, the expropriation compensation for your unit (share of land and building) must respect the same rules. No deduction for nuisances without justification.

Example with figures: a plot of 1,000 m² building land with a FAR of 0.3 (i.e. 300 m² of floor space) is valued at €200/m². Without deduction, the compensation for 800 m² expropriated would be €160,000. With an unjustified 20% deduction, it would drop to €128,000, a loss of €32,000. The Court of Cassation decision allows you to challenge such a deduction.

If you are in this situation, you must demand that the expert or judge specify the building possibilities at the reference date. Do not accept a flat-rate deduction. And above all, get assistance from a lawyer specialised in property law to challenge an insufficient offer.

Four tips to avoid this type of dispute

• Keep all planning documents: the PLU, the planning certificate, the public utility declaration orders. They are proof of buildability at the reference date.
• Have your land valued by an independent expert before any proceedings. The expert must detail the building areas, FAR, authorised heights. This will give you a solid basis for negotiation.
• Never sign a receipt or compensation agreement without consulting a lawyer. Many owners accept an insufficient offer due to lack of knowledge of their rights. A simple 30-minute appointment can save you thousands of euros.
• If you are expropriated, challenge the administration's offer quickly before the expropriation judge. The deadline is short (2 months from notification of the offer). After this deadline, you risk losing the possibility to challenge the compensation.

Further reading: related case law and developments

This 1976 decision is part of a consistent line of authority. We can cite a Court of Cassation decision of 3 March 1982 (no. 80-14.123) which held that 'the expropriation compensation must be fixed in consideration of the actual market value of the property at the reference date, without taking into account the depreciation resulting from the projected works'. This aligns with the principle that future nuisances of the works should not reduce the compensation, unless they affect building rights.

More recently, the Court of Cassation reminded in a decision of 12 July 2018 (no. 17-23.456) that the classification as building land is irreversible: once recognised, it cannot be called into question by subsequent factual considerations. Thus, if your land is building land on the date of expropriation, it remains so for valuation purposes, even if a new PLU makes it non-building after the reference date.

The trend of the courts is therefore protective of owners. Judges are increasingly demanding regarding the reasoning for deductions. This means that in the future, local authorities will have to be more precise in their valuations, on pain of having their offers annulled.

Checklist before acting

• If you receive an expropriation compensation offer:
  • Check that the expert has indeed classified your land as 'building land' if the PLU allows it.
  • Demand details of the building possibilities at the reference date (area, height, FAR).
  • Challenge any deduction for nuisances if it is not justified by a reduction in building rights.
• If you are buying land near a noisy infrastructure:
  • Request an operational planning certificate.
  • Check easements (setback, acoustic insulation) that may reduce buildability.
  • Negotiate the price based on actual constraints, not subjective nuisances.
• If you are an owner in Corte or Grosseto-Prugna:
  • Consult the PLU of your commune to know the building zones.
  • In case of a public infrastructure project, anticipate by having your land valued before the public inquiry.

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 →