La Tronche · report
Renovation in La Tronche
In 2025, 23% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 23%
Homes authorised in La Tronche: 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 | 34 | 10 | 44 |
| 2024 | 90 | — | 90 |
| 2023 | 7 | 1 | 8 |
| 2022 | 160 | 44 | 204 |
| 2021 | 6 | 2 | 8 |
| 2020 | 55 | 1 | 56 |
| 2019 | 28 | 28 | 56 |
| 2018 | 78 | 1 | 79 |
| 2017 | 4 | 1 | 5 |
| 2016 | 28 | — | 28 |
| 2015 | 7 | 4 | 11 |
| 2014 | 12 | — | 12 |
| 2013 | 6 | — | 6 |
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 La Tronche
At the median sale price, a 90 m² home costs €329,220. With 10% down and a 30-year mortgage, the payment is €1,281 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 23%
- Payment, one income
- 45%
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
- €1,323
- Owning per month
- €1,148
Figures for Isère: La Tronche 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 fell by 23 while 6 homes were started.
- Homes started, 2022
- 6
- Population change, 2022
- −23
12.1% of the 3,438 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 12.1%
- Empty homes
- 415