Chilly-Mazarin · report
Renovation in Chilly-Mazarin
In 2025, 38% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 38%
Homes authorised in Chilly-Mazarin: new buildings and existing ones
Dwellings authorised each year, by the year the permit was granted: in new buildings, and by works on existing buildings (conversions, extensions, changes of use). SDES Sitadel.
- Existing buildings
- New buildings
Show the numbers
| Year | New buildings | Existing buildings | Total |
|---|---|---|---|
| 2025 | 5 | 3 | 8 |
| 2024 | 189 | 2 | 191 |
| 2023 | 3 | 2 | 5 |
| 2022 | 5 | 3 | 8 |
| 2021 | 284 | 1 | 285 |
| 2020 | 146 | 1 | 147 |
| 2019 | 51 | — | 51 |
| 2018 | 505 | 5 | 510 |
| 2017 | 146 | 6 | 152 |
| 2016 | 63 | 2 | 65 |
| 2015 | 2 | 1 | 3 |
| 2014 | 37 | 4 | 41 |
| 2013 | 7 | 1 | 8 |
Only permits that create dwellings are listed, so renovation that adds no home (refurbishing, insulating, re-roofing) is not counted. A permit is permission to build, not a finished home. The current year is left out until it is complete.
Other reports for Chilly-Mazarin
At the median sale price, a 90 m² home costs €237,600. With 10% down and a 30-year mortgage, the payment is €925 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 21%
- Payment, one income
- 43%
Owning a 90 m² apartment costs less each month than renting it. Owning counts interest, running costs and the return the deposit could earn, at apartments' median sale price; rent is the asking rent. Repaying the loan is saving, so it is left out.
- Rent per month
- €1,588
- Owning per month
- €836
Figures for Essonne: Chilly-Mazarin has no reliable figures of its own.
33.7% fewer homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 5,659
In 2022 the population grew by 462 while 3 homes were started: 154.0 new residents for every new home.
- New residents per new home, 2022
- 154.0
- Population change, 2022
- +462
5.6% of the 9,399 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 5.6%
- Empty homes
- 527