Janzé · report
Renovation in Janzé
In 2025, 33% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 33%
Homes authorised in Janzé: 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 | 14 | 7 | 21 |
| 2024 | 22 | 7 | 29 |
| 2023 | 21 | 3 | 24 |
| 2022 | 78 | 2 | 80 |
| 2021 | 58 | 6 | 64 |
| 2020 | 52 | 2 | 54 |
| 2019 | 61 | 4 | 65 |
| 2018 | 58 | 2 | 60 |
| 2017 | 101 | 2 | 103 |
| 2016 | 68 | 3 | 71 |
| 2015 | 25 | 3 | 28 |
| 2014 | 42 | — | 42 |
| 2013 | 17 | 1 | 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 Janzé
At the median sale price, a 90 m² home costs €217,530. With 10% down and a 30-year mortgage, the payment is €847 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 19%
- Payment, one income
- 39%
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
- €1,033
- Owning per month
- €833
Figures for Ille-et-Vilaine: Janzé has no reliable figures of its own.
17.6% more homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 12,128
In 2022 the population grew by 31 while 87 homes were started: 0.4 new residents for every new home.
- New residents per new home, 2022
- 0.4
- Population change, 2022
- +31
6.2% of the 4,053 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 6.2%
- Empty homes
- 253