Triel-sur-Seine · report
Renovation in Triel-sur-Seine
In 2025, 15% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 15%
Homes authorised in Triel-sur-Seine: 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 | 173 | 30 | 203 |
| 2024 | 62 | 31 | 93 |
| 2023 | 7 | 2 | 9 |
| 2022 | 94 | 6 | 100 |
| 2021 | 17 | 11 | 28 |
| 2020 | 8 | 5 | 13 |
| 2019 | 17 | — | 17 |
| 2018 | 16 | 83 | 99 |
| 2017 | 44 | 2 | 46 |
| 2016 | 70 | 12 | 82 |
| 2015 | 151 | 5 | 156 |
| 2014 | 154 | 4 | 158 |
| 2013 | 9 | 9 | 18 |
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 Triel-sur-Seine
At the median sale price, a 90 m² home costs €294,210. With 10% down and a 30-year mortgage, the payment is €1,145 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 21%
- Payment, one income
- 42%
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
- €1,582
- Owning per month
- €1,038
Figures for Yvelines: Triel-sur-Seine has no reliable figures of its own.
12.7% fewer homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 7,492
In 2022 the population fell by 180 while 16 homes were started.
- Homes started, 2022
- 16
- Population change, 2022
- −180
6.2% of the 5,444 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 6.2%
- Empty homes
- 340