Montbonnot-Saint-Martin · report
Renovation in Montbonnot-Saint-Martin
In 2025, 12% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 12%
Homes authorised in Montbonnot-Saint-Martin: 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 | 15 | 2 | 17 |
| 2024 | 63 | 6 | 69 |
| 2023 | 11 | — | 11 |
| 2022 | 70 | — | 70 |
| 2021 | 46 | 3 | 49 |
| 2020 | 6 | 1 | 7 |
| 2019 | 27 | 11 | 38 |
| 2018 | 28 | 2 | 30 |
| 2017 | 161 | 1 | 162 |
| 2016 | 21 | 4 | 25 |
| 2015 | 21 | 2 | 23 |
| 2014 | 192 | — | 192 |
| 2013 | 8 | 1 | 9 |
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 Montbonnot-Saint-Martin
At the median sale price, a 90 m² home costs €396,360. With 10% down and a 30-year mortgage, the payment is €1,543 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 25%
- Payment, one income
- 50%
Owning and renting a 90 m² apartment cost about the same each month. 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
- €1,505
- Owning per month
- €1,435
Figures for Isère: Montbonnot-Saint-Martin 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 144 while 11 homes were started: 13.1 new residents for every new home.
- New residents per new home, 2022
- 13.1
- Population change, 2022
- +144
4.8% of the 2,675 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 4.8%
- Empty homes
- 129