Osny · report
Renovation in Osny
In 2025, 1% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 1%
Homes authorised in Osny: 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 | 290 | 3 | 293 |
| 2024 | 43 | 12 | 55 |
| 2023 | 72 | 8 | 80 |
| 2022 | 202 | 7 | 209 |
| 2021 | 439 | 1 | 440 |
| 2020 | 109 | 9 | 118 |
| 2019 | 177 | 5 | 182 |
| 2018 | 47 | 4 | 51 |
| 2017 | 23 | 8 | 31 |
| 2016 | 39 | 2 | 41 |
| 2015 | 236 | — | 236 |
| 2014 | 96 | 6 | 102 |
| 2013 | 179 | 1 | 180 |
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 Osny
At the median sale price, a 90 m² home costs €317,880. With 10% down and a 30-year mortgage, the payment is €1,237 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 25%
- Payment, one income
- 51%
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
- €1,628
- Owning per month
- €1,222
Figures for Val-d'Oise: Osny 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 483 while 297 homes were started: 1.6 new residents for every new home.
- New residents per new home, 2022
- 1.6
- Population change, 2022
- +483
4.1% of the 6,741 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 4.1%
- Empty homes
- 278