Le Chesnay-Rocquencourt · report
Renovation in Le Chesnay-Rocquencourt
In 2025, 3% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 3%
Homes authorised in Le Chesnay-Rocquencourt: 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 | 29 | 1 | 30 |
| 2024 | 135 | 67 | 202 |
| 2023 | 89 | 8 | 97 |
| 2022 | 63 | — | 63 |
| 2021 | 44 | 3 | 47 |
| 2020 | 67 | 4 | 71 |
| 2019 | 2 | 2 | 4 |
| 2018 | 134 | 1 | 135 |
| 2017 | 142 | 27 | 169 |
| 2016 | 3 | — | 3 |
| 2015 | 6 | 1 | 7 |
| 2014 | 3 | 1 | 4 |
| 2013 | 13 | 3 | 16 |
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 Le Chesnay-Rocquencourt
At the median sale price, a 90 m² home costs €491,580. With 10% down and a 30-year mortgage, the payment is €1,913 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 30%
- Payment, one income
- 60%
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
- €1,956
- Owning per month
- €1,696
Figures for Yvelines: Le Chesnay-Rocquencourt has no reliable figures of its own.
12.7% fewer homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 7,492
In 2022 the population fell by 375 while 27 homes were started.
- Homes started, 2022
- 27
- Population change, 2022
- −375
6.6% of the 16,406 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 6.6%
- Empty homes
- 1,089