Cachan · report
Renovation in Cachan
In 2025, 8% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 8%
Homes authorised in Cachan: 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 | 544 | 45 | 589 |
| 2024 | 260 | 5 | 265 |
| 2023 | 35 | 8 | 43 |
| 2022 | 3 | 6 | 9 |
| 2021 | 82 | 7 | 89 |
| 2020 | 68 | 4 | 72 |
| 2019 | 112 | 7 | 119 |
| 2018 | 61 | 134 | 195 |
| 2017 | 113 | 3 | 116 |
| 2016 | 77 | 89 | 166 |
| 2015 | 113 | 17 | 130 |
| 2014 | 101 | 14 | 115 |
| 2013 | 292 | 4 | 296 |
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 Cachan
At the median sale price, a 90 m² home costs €454,950. With 10% down and a 30-year mortgage, the payment is €1,771 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 37%
- Payment, one income
- 74%
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
- €2,097
- Owning per month
- €1,625
Figures for Val-de-Marne: Cachan has no reliable figures of its own.
9.9% more homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 12,010
In 2022 the population grew by 577 while 29 homes were started: 19.9 new residents for every new home.
- New residents per new home, 2022
- 19.9
- Population change, 2022
- +577
5.2% of the 15,178 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 5.2%
- Empty homes
- 793