Gagny · report
Renovation in Gagny
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 Gagny: 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 | 92 | 8 | 100 |
| 2024 | 78 | 43 | 121 |
| 2023 | 535 | 29 | 564 |
| 2022 | 343 | 32 | 375 |
| 2021 | 346 | 10 | 356 |
| 2020 | 464 | 183 | 647 |
| 2019 | 552 | 7 | 559 |
| 2018 | 1,329 | 69 | 1,398 |
| 2017 | 393 | 5 | 398 |
| 2016 | 23 | 12 | 35 |
| 2015 | 20 | 5 | 25 |
| 2014 | 49 | 2 | 51 |
| 2013 | 12 | 1 | 13 |
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 Gagny
At the median sale price, a 90 m² home costs €306,900. With 10% down and a 30-year mortgage, the payment is €1,195 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 28%
- Payment, one income
- 56%
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
- €1,670
- Owning per month
- €1,019
Figures for Seine-Saint-Denis: Gagny has no reliable figures of its own.
10.1% fewer homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 11,995
In 2022 the population grew by 1,523 while 367 homes were started: 4.1 new residents for every new home.
- New residents per new home, 2022
- 4.1
- Population change, 2022
- +1,523
4.7% of the 17,590 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 4.7%
- Empty homes
- 829