Introduction

The rise of ESG criteria in real estate has been accompanied by increased vigilance from regulators. Developers, property companies, and fund managers must now prove their environmental commitments. In the absence of verifiable evidence—particularly regarding biodiversity—sanctions are multiplying. Here is a detailed overview of recent cases in France and Europe.

1. Misleading ESG claims: the first financial penalties

• Primonial REIM (France, 2025) was fined €40,000 for distributing an investment prospectus containing ESG commitments deemed unsubstantiated, particularly regarding biodiversity and climate resilience. The AMF considered the use of the term "sustainable assets" to be misleading due to a lack of evidence methodology [source: L'Info Durable, 2025].
• BNP Paribas Asset Management (2023) was fined €1.5 million in the United States for presenting certain funds as "green" without a full audit of the European taxonomy. This case set a precedent for real estate funds claiming environmental performance without verified biodiversity criteria.
• DWS/Deutsche Bank (Germany, 2023) €21 million fine for massive greenwashing: real estate assets were labeled ESG without traceability of environmental data. This case triggered systematic audits by BaFin on the management of "sustainable" real estate funds.

2. Permit cancellations for harm to biodiversity

• Administrative Court of Toulouse (2024) Permit cancelled for destruction of bat habitats in a residential project in a Natura 2000 zone. The developer had not complied with article L.411-1 of the Environmental Code.
• Lyon Administrative Court of Appeal (2023) Annulment of a building permit in Villeurbanne due to an impact study deemed "manifestly insufficient" on protected flora (wild orchids).
• Montpellier Administrative Court (2022): Suspension of a construction project after the discovery of a colony of spotted salamanders. The ruling set a precedent regarding the obligation to update natural history inventories before construction begins.
• The Aigle development zone case in Grenoble (2021): The project was urgently suspended due to harm to protected species (common pipistrelle bat, green lizard). The developer had to finance compensatory measures worth over €500,000.

3. Civil and criminal convictions for environmental damage

• Mayotte (OFB, 2024) 3-year suspended prison sentence for destruction of protected natural habitats without prefectural authorization. The construction site involved a housing development in a classified wetland area.
• La Teste-de-Buch case (2022) A local developer sentenced to 18 months suspended for illegal felling of umbrella pines and damage to the coastal dune, classified as a Natura 2000 zone.
• The "Résidence du Parc" case in Pontoise (2025): Two developers were convicted of abusive litigation brought against an environmental association. The case revealed a project whose permit violated measures protecting local species (hedgehogs and bats).

4. Civil disputes related to "green promises"

• “Misleading Green Value” Case (Marseille, 2024): Condominium owners won their case against a developer who presented a building as a “high environmental performance building.” The actual thermal study did not meet the advertised commitments.
• Nexity (2023) Class action lawsuit filed by buyers regarding a project advertised as "carbon neutral," even though the materials used lacked a verified life cycle assessment (LCA). The case is still ongoing.
• Quartus (2022) Formal notice by the DGCCRF for misleading environmental claims in marketing materials: lack of evidence on the “integrated biodiversity” announced in the sales brochures.

5. Regulatory framework: towards a requirement of proof

• Climate and Resilience Law (2021) Target of zero net artificialisation by 2050. Developers must now prove avoidance and compensation measures.
• Consumer Code – Articles L121-2 and L121-3: Environmental claims must be accurate, verifiable, and proportionate. Penalties for greenwashing can reach 80% of the advertising expenditure in question.
• CSRD and SFDR (2024) Listed project developers must publish verifiable indicators on the biodiversity impact of their projects. The absence of data or erroneous publication constitutes a governance failure.

6. Emblematic European Cases

• Royal BAM Group (Netherlands, 2023) Fine of €500,000 for destruction of bird habitats during a port project, without prior derogation.
• Eiffage Polska (Poland, 2022) Sentenced to a €200,000 fine for violating Natura 2000 zones during a motorway construction project.
• Vinci Construction (Spain, 2021) Obligation to replant 12,000 trees after illegal destruction of ecological corridors on a logistics project.

Conclusion

The legal and reputational risks associated with unproven environmental claims now extend to all players in the real estate sector. Cases involving Primonial, Nexity, BAM, Vinci, Pontoise, and Mayotte demonstrate that environmental proof has become a central issue in modern real estate law.

Developers must now base their ESG communications on certified methods and independent audits, such as those overseen by ISO 17065 accredited bodies, or risk having their projects suspended, their permits cancelled or their assets devalued.