Seyssins · report
Renovation in Seyssins
In 2025, 98% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 98%
Homes authorised in Seyssins: 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 | 2 | 81 | 83 |
| 2024 | 20 | 1 | 21 |
| 2023 | 1 | 5 | 6 |
| 2022 | 69 | — | 69 |
| 2021 | 49 | 1 | 50 |
| 2020 | 43 | — | 43 |
| 2019 | 88 | 5 | 93 |
| 2018 | 84 | 2 | 86 |
| 2017 | 40 | 3 | 43 |
| 2016 | 59 | 1 | 60 |
| 2015 | 69 | 2 | 71 |
| 2014 | 29 | 2 | 31 |
| 2013 | 130 | 10 | 140 |
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 Seyssins
At the median sale price, a 90 m² home costs €302,220. With 10% down and a 30-year mortgage, the payment is €1,176 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 22%
- Payment, one income
- 43%
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
- €1,333
- Owning per month
- €1,094
Figures for Isère: Seyssins has no reliable figures of its own.
31.7% fewer homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 6,432
In 2022 the population grew by 5 while 11 homes were started: 0.5 new residents for every new home.
- New residents per new home, 2022
- 0.5
- Population change, 2022
- +5
3.9% of the 3,617 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 3.9%
- Empty homes
- 142