Chilly-Mazarin Introduces Rental Permit to Ensure Decent Housing from January 2027

The municipality is launching a private rental control system to combat substandard housing and overcrowding.

Generic image of the facade of a modern municipal building in the Île-de-France region, under a slightly overcast sky.
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Generic image of the facade of a modern municipal building in the Île-de-France region, under a slightly overcast sky.

Starting January 7, 2027, the Town of Chilly-Mazarin will implement a rental permit in several sectors to guarantee decent and safe housing.

The municipality of Chilly-Mazarin, the first in the Paris-Saclay agglomeration to adopt this system, is committed to ensuring residents have decent, safe, and quality housing. The goal is to prevent the rental of degraded, damp, poorly insulated properties, or those posing safety risks to occupants, by acting proactively rather than waiting for reports of unhealthiness.
"We are acting to strengthen the fight against slum landlords, prevent housing overcrowding, and preserve the quality of the private rental stock. It will also allow for better identification of degraded housing and support for owners in their renovation when necessary," indicates Florence Terrien, Deputy Mayor for Solidarity.
Two procedures will apply depending on the sectors defined by the Town. Private landlords will either have to submit a rental declaration within 15 days of signing the lease, or obtain a prior rental authorization before signing. These obligations will apply upon the first rental or a change of tenant.
Failure to comply with these obligations may result in financial penalties of up to €5,000, or even €15,000 for renting despite a refusal of authorization. Beyond control, the rental permit also serves as a tool for prevention and support, aiming to sustainably preserve housing quality.
Affected owners can find the map of the concerned sectors, the list of streets, and all necessary information on the Town's website.
Based on information from the official source: Mairie de Chilly-Mazarin (19/10/2026)