Lagny-sur-Marne · report
Renovation in Lagny-sur-Marne
In 2025, 14% of the homes authorised were in existing buildings: conversions, extensions and changes of use.
- Homes in existing buildings, 2025
- 14%
Homes authorised in Lagny-sur-Marne: 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 | 80 | 13 | 93 |
| 2024 | 232 | 10 | 242 |
| 2023 | 117 | 3 | 120 |
| 2022 | 223 | 3 | 226 |
| 2021 | 99 | 7 | 106 |
| 2020 | 52 | 5 | 57 |
| 2019 | 88 | 5 | 93 |
| 2018 | 253 | 35 | 288 |
| 2017 | 325 | 27 | 352 |
| 2016 | 212 | 4 | 216 |
| 2015 | 60 | 99 | 159 |
| 2014 | 84 | 16 | 100 |
| 2013 | 13 | 146 | 159 |
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 Lagny-sur-Marne
At the median sale price, a 90 m² home costs €352,350. With 10% down and a 30-year mortgage, the payment is €1,371 a month. The HCSF caps it at 35% of a household's income.
- Payment, two incomes
- 29%
- Payment, one income
- 58%
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
- €1,578
- Owning per month
- €1,269
Figures for Seine-et-Marne: Lagny-sur-Marne has no reliable figures of its own.
29.0% fewer homes were licensed for construction in the last 12 months than in an average year of the past decade.
- Licensed, 12 months
- 7,285
In 2022 the population grew by 28 while 140 homes were started: 0.2 new residents for every new home.
- New residents per new home, 2022
- 0.2
- Population change, 2022
- +28
8.1% of the 11,086 homes counted in the 2023 census stood empty, whether for sale, to let or for other reasons.
- Empty, 2023 census
- 8.1%
- Empty homes
- 902