Overview

• In its fifth annual barometer, the Foundation reports 32% of roughly 20,000 listings reviewed between August 2024 and August 2025 exceed legal ceilings, a four‑point rise year over year.
• Overcharges average €192 per month nationwide and €237 in Paris, costing renters in the capital more than €2,800 annually.
• Non‑compliance is highly uneven geographically, with Plaine Commune at 59% and Biarritz at 53%, compared with about a quarter of listings in Bordeaux and mixed results in newer zones such as Grenoble (45%) and the Pays Basque (38%).
• Violations concentrate in very small homes (about 91% of units of 10 m² or less), furnished rentals (41%), and G‑rated energy “passoires” (38%), with platform disparities from 24% on SeLoger to 48% on PAP.
• Pointing to vague rules on compléments de loyer and complaint‑driven policing, the Foundation urges opening rent control to all willing cities, increasing fines paid back to local authorities, and strengthening proactive checks ahead of the experiment’s scheduled end in November 2026.