The recorded cadastral area and the area calculated from its outline can differ. Learn how to read the difference without treating it as proof of the area being sold.
Prepared by Carteparcelle · OPL Consulting Oy · Sources checked on
Identify what each figure measures
Carteparcelle shows the recorded area, or contenance, when it is supplied by the cadastral source. Calculated area comes from the parcel geometry in our index. A missing recorded area remains unknown; it is not replaced with zero.
These figures concern land, not a house’s habitable area, a proposal’s floor area or an apartment’s private internal area. Building counts and attributes are displayed separately.
Read a difference without choosing a figure arbitrarily
Fictional example: recorded area is 610 m² and calculated area is 640 m². The 30 m² difference is about 4.9% of the recorded area. This calculation describes a difference between values; it proves neither that extra land is available nor that a deed is wrong.
The French tax administration states that cadastral information does not guarantee property areas. This guide uses no difference threshold to validate an area. For a purchase or disagreement, compare the documents with the notary or licensed land surveyor.
What the measurement tool does
Drawing an area on the map answers “what area is enclosed by the points I placed?”. It depends on your chosen outline and does not replace the recorded area or a ground survey. A detailed display does not make boundaries legally more precise.
When comparing readings, use the same perimeter and units. One hectare is 10,000 m². Check that you are comparing the same single parcel, rather than a parcel with a group of plots.
Before making an area-based decision
Record both figures with their labels, the cadastral reference and the source date. Describe the perimeter you need to understand. Avoid sending only a screenshot with the labels cropped out.
If the uncertainty concerns the boundary itself, it is more than a numerical question: bornage establishes boundaries between neighbouring private properties. Consult existing documents and a licensed surveyor before moving a fence or inferring usable land area.
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.