Derval · report
Renovation in Derval
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 Derval: 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 | 28 | 5 | 33 |
| 2024 | 3 | 7 | 10 |
| 2023 | 6 | 2 | 8 |
| 2022 | 20 | 2 | 22 |
| 2021 | 32 | 6 | 38 |
| 2020 | 11 | 34 | 45 |
| 2019 | 15 | 4 | 19 |
| 2018 | 9 | 8 | 17 |
| 2017 | 11 | 1 | 12 |
| 2016 | 6 | — | 6 |
| 2015 | 14 | — | 14 |
| 2014 | 13 | 1 | 14 |
| 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 Derval
At the median sale price, a 90 m² home costs €135,270. With 10% down and a 30-year mortgage, the payment is €526 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 13%
- Payment, one income
- 26%
Figures for Loire-Atlantique: Derval 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 23 while 27 homes were started: 0.9 new residents for every new home.
- New residents per new home, 2022
- 0.9
- Population change, 2022
- +23
7.8% of the 1,694 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 7.8%
- Empty homes
- 132