Massy (91) · report
Renovation in Massy (91)
In 2025, 4% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 4%
Homes authorised in Massy (91): 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 | 354 | 16 | 370 |
| 2024 | 5 | 5 | 10 |
| 2023 | 527 | 5 | 532 |
| 2022 | 112 | 7 | 119 |
| 2021 | 258 | — | 258 |
| 2020 | 114 | 3 | 117 |
| 2019 | 133 | 1 | 134 |
| 2018 | 1,088 | 3 | 1,091 |
| 2017 | 1,544 | 24 | 1,568 |
| 2016 | 231 | 3 | 234 |
| 2015 | 625 | 14 | 639 |
| 2014 | 998 | — | 998 |
| 2013 | 492 | — | 492 |
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 Massy (91)
At the median sale price, a 90 m² home costs €379,440. With 10% down and a 30-year mortgage, the payment is €1,477 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 32%
- Payment, one income
- 65%
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
- €1,807
- Owning per month
- €1,369
Figures for Essonne: Massy (91) 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 grew by 1,132 while 282 homes were started: 4.0 new residents for every new home.
- New residents per new home, 2022
- 4.0
- Population change, 2022
- +1,132
4.1% of the 25,297 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 4.1%
- Empty homes
- 1,041