Hello! Late to this thread but same situation, looking around Serre Chevalier and trying to do the checks before offering rather than at the compromis.
I pulled the open data (PLU, monument perimeters, risk plan, sold prices) into a one-page check for a listing near Briançon. Two surprises: the commune bans change of destination outright in every zone (JaneJones’s point about tightening is real, and worse in some places), and the village core is inside two monument perimeters. I’ve attached because think it could be useful for others
Curious to see if I’m missing anything that others are checking?
The report:
DD for village house near Briancon (sample)
Part of a village house, about 104 m2, sold as an empty shell to fit out. Asking around EUR 150,000. All from official open data (GPU planning map, Georisques, DVF sold prices, ADEME DPE register) plus the commune’s PLU. Verdicts: CLEAR, CONSTRAINT (plan for it), RESOLVE FIRST (before any offer).
Summary. Roof and facade already redone, so the expensive risks are fixed. The project depends on one registry fact and one map: what the lot is officially registered as, and the risk-plan zone for the parcel.
1. Can it legally become a home? RESOLVE FIRST. “Not subject to DPE” and “to fit out entirely” suggest it is not registered as living space today. This commune’s PLU forbids changing a building’s official use, in every zone. If the lot is already registered as habitation, normal works permission should follow (the plan encourages converting old buildings, plus about 2 parking spaces to show). If it is registered as a barn or annexe, the plan blocks conversion and there is no project. Verify: the registered use (co-ownership deed, land registry), then the town hall in writing via a certificat d’urbanisme. Condition any offer on it.
2. Planning zone. CLEAR: zone UB. With design rules: roof windows taller than wide, solar allowed on existing roofs, traditional two-slope roofs. In the old-core zone (UA), roller shutters and verandas are banned.
3. Historic monuments. CONSTRAINT. The village core is inside the protection zones of two listed monuments. The state heritage architect (ABF) must approve new windows, roof windows or solar. Talk to the ABF before fixing the design.
4. Natural-risk plan. RESOLVE FIRST. A PPR (2009) covers the sector: flood, avalanche, rockfall, landslide, old underground quarries, earthquake, forest fire, radon. Expected: buildable with conditions (the core is zoned urban in a plan written after the PPR), but read the PPR map at the town hall or DDT before offering. Fixed rules either way: 10 m back from the torrent, 4 m from main canals.
Also flagged: radon class 3 (plan ventilation); moderate seismic zone; two closed industrial sites nearby, identified and mapped, neither on the parcel; nearby pre-1948 homes rate D to G on the DPE, so insulate properly now; 2-lot co-ownership, so the only neighbour must agree structural works; mains drainage confirmed by the PLU.
Price. Recorded sales: good-condition village homes EUR 2,300 to 3,700 per m2, unrenovated EUR 1,300 to 1,800. Finished value about EUR 285,000; fit-out EUR 125,000 to 187,000 plus contingency. The sums support a purchase of EUR 85,000 to 115,000 to live in. Renting or flipping does not work at anything near asking.