Cergy · report
Renovation in Cergy
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 Cergy: 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 | 208 | 6 | 214 |
| 2024 | 359 | 7 | 366 |
| 2023 | 134 | 165 | 299 |
| 2022 | 129 | 3 | 132 |
| 2021 | 858 | 7 | 865 |
| 2020 | 735 | 48 | 783 |
| 2019 | 771 | 286 | 1,057 |
| 2018 | 432 | 16 | 448 |
| 2017 | 840 | 5 | 845 |
| 2016 | 123 | — | 123 |
| 2015 | 446 | 11 | 457 |
| 2014 | 295 | 177 | 472 |
| 2013 | 363 | 6 | 369 |
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 Cergy
At the median sale price, a 90 m² home costs €278,280. With 10% down and a 30-year mortgage, the payment is €1,083 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 29%
- Payment, one income
- 58%
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
- €1,664
- Owning per month
- €1,026
Figures for Val-d'Oise: Cergy has no reliable figures of its own.
32.3% fewer homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 4,869
In 2022 the population grew by 1,328 while 814 homes were started: 1.6 new residents for every new home.
- New residents per new home, 2022
- 1.6
- Population change, 2022
- +1,328
7.9% of the 33,100 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 7.9%
- Empty homes
- 2,610