Boulogne-Billancourt · report
Renovation in Boulogne-Billancourt
In 2025, 43% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 43%
Homes authorised in Boulogne-Billancourt: 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 | 410 | 313 | 723 |
| 2024 | 6 | 135 | 141 |
| 2023 | 378 | 14 | 392 |
| 2022 | 223 | 167 | 390 |
| 2021 | 134 | 78 | 212 |
| 2020 | 400 | 172 | 572 |
| 2019 | 251 | 70 | 321 |
| 2018 | 83 | 146 | 229 |
| 2017 | 223 | 31 | 254 |
| 2016 | 215 | 50 | 265 |
| 2015 | 614 | 24 | 638 |
| 2014 | 156 | 60 | 216 |
| 2013 | 313 | 34 | 347 |
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 Boulogne-Billancourt
At the median sale price, a 90 m² home costs €751,860. With 10% down and a 30-year mortgage, the payment is €2,926 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 44%
- Payment, one income
- 88%
Owning and renting a 90 m² apartment cost about the same each month. 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
- €2,676
- Owning per month
- €2,744
Figures for Hauts-de-Seine: Boulogne-Billancourt has no reliable figures of its own.
2.7% more homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 12,666
In 2022 the population fell by 1,186 while 290 homes were started.
- Homes started, 2022
- 290
- Population change, 2022
- −1,186
7.2% of the 68,389 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 7.2%
- Empty homes
- 4,921