Treillières · report
Renovation in Treillières
In 2025, 9% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 9%
Homes authorised in Treillières: 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 | 91 | 9 | 100 |
| 2024 | 51 | 7 | 58 |
| 2023 | 64 | 1 | 65 |
| 2022 | 52 | 6 | 58 |
| 2021 | 66 | 1 | 67 |
| 2020 | 80 | 1 | 81 |
| 2019 | 88 | 9 | 97 |
| 2018 | 134 | 2 | 136 |
| 2017 | 181 | 1 | 182 |
| 2016 | 277 | 2 | 279 |
| 2015 | 102 | 1 | 103 |
| 2014 | 81 | 6 | 87 |
| 2013 | 179 | 3 | 182 |
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 Treillières
At the median sale price, a 90 m² home costs €276,030. With 10% down and a 30-year mortgage, the payment is €1,074 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
- €1,157
- Owning per month
- €1,064
Figures for Loire-Atlantique: Treillières has no reliable figures of its own.
13.1% fewer homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 10,457
In 2022 the population grew by 186 while 70 homes were started: 2.7 new residents for every new home.
- New residents per new home, 2022
- 2.7
- Population change, 2022
- +186
4.2% of the 4,392 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 4.2%
- Empty homes
- 183
Public bodies signed €18.1K of housing works here in 2025, and €185.7K since 2024.
- Signed in 2025
- €18.1K
- Per resident, 2025
- €2