A building survey (or existing-condition plan) describes a building as it is today: walls, partitions, openings, staircases, heights, floor levels, elevations. This is different from the architect's plan, which describes what was supposed to be built: between the two, there is often an added floor, an enclosed terrace, a moved partition.
The survey is not an administrative procedure in itself. It becomes necessary when another procedure relies on exact plans of the existing building: placing a building under co-ownership, updating the title plan to match the situation on the ground after construction, a renovation or extension project, or an application for regularisation. The rules of these procedures are explained in our guides Co-ownership and Building authorisation.
- Plans of each level, from the basement to the roof terrace
- Elevations and sections
- Calculation of areas by room, by level and by lot
- Division plans for sale or conversion to co-ownership
For a titled building, the co-ownership technical file must be drawn up by a surveying engineer registered with the ONIGT, then checked by the cadastre service (Decree No. 2-13-18, Article 17): see our Co-ownership plans page.