Orsay · report
Renovation in Orsay
In 2025, 0% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 0%
Homes authorised in Orsay: 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 | 792 | 2 | 794 |
| 2024 | 211 | 3 | 214 |
| 2023 | 148 | 8 | 156 |
| 2022 | 266 | 3 | 269 |
| 2021 | 19 | 1 | 20 |
| 2020 | 19 | — | 19 |
| 2019 | 114 | 7 | 121 |
| 2018 | 27 | 10 | 37 |
| 2017 | 78 | 70 | 148 |
| 2016 | 169 | 15 | 184 |
| 2015 | 7 | — | 7 |
| 2014 | 6 | 15 | 21 |
| 2013 | 19 | 3 | 22 |
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 Orsay
At the median sale price, a 90 m² home costs €367,740. With 10% down and a 30-year mortgage, the payment is €1,431 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 23%
- Payment, one income
- 47%
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
- €1,762
- Owning per month
- €1,291
Figures for Essonne: Orsay has no reliable figures of its own.
33.7% fewer homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 5,659
In 2022 the population fell by 157 while 19 homes were started.
- Homes started, 2022
- 19
- Population change, 2022
- −157
7.5% of the 8,374 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 7.5%
- Empty homes
- 630