Splitting off a lot to sell or build on: the formalities depend on the project. Understand the steps and the surveyor’s role.
Prepared by Carteparcelle · OPL Consulting Oy · Sources checked on
Start from the purpose of the division
Service Public distinguishes two situations: dividing in order to build on one or more detached parcels, or dividing with no building project. With no building project, a division in principle needs no planning formality, unless the land lies in a protected area.
A division for building generally requires a prior declaration. Since 28 September 2026, according to Service Public’s update, location in a protected area alone no longer requires a development permit. That permit remains required for subdivisions creating or developing roads, spaces or facilities shared by several building lots and specific to the subdivision. Permission to build does not authorise a division. The official page is being updated: confirm the procedure with the planning department.
The surveyor’s role
Before the application is filed, a chartered surveyor (géomètre-expert) marks out the parcels (bornage) and draws up the document that amends the cadastral parcel map (DMPC), which allows the cadastre to be updated.
Bornage fixes the boundaries between neighbouring private properties. A line drawn on screen, however precise it looks, does not replace this work: the cadastral map’s geometry serves tax purposes and is not authoritative for boundaries.
Service Public — Planning authorisation for dividing land · Service Public — Boundary marking (bornage) · Service Public — How to consult the cadastre
Preparing the meeting with the map
Carteparcelle helps you prepare your questions: the parcel’s recorded and calculated areas, its PLU zone, published prescriptions and easements, and existing buildings. The measuring tool lets you sketch a split and estimate the resulting areas.
Fictional example: on a 1,200 m² parcel you sketch a 450 m² lot on the street side. That figure describes your drawing, not a future lot: the PLU rules (access, siting, utilities) and the surveyor’s measurements will determine the split that is possible. Bring the sketch and the cadastral reference to the planning department.
After the division: deeds, taxes and the map
If you sell one or more of the parcels created by the division, the notary records the division with the land registry office. A building put up afterwards may be liable to the development tax (taxe d’aménagement), and the division affects property taxes.
Carteparcelle shows the cadastral map as of the date given on the card. A recent division may not appear yet: the new parcels appear once the cadastre, and then our data, have been updated.
These guides provide general information. Before making a decision about a property, confirm the relevant details with the responsible authority or professional.
Official sources
The links below lead to official sources in French.