Divide a plot into lots: sketch the division before you commit

What dividing a plot means

A division of land splits one parcel into several lots. People do it to build a second house in the garden, to sell part of the ground, to share an inheritance or to give a child a plot to build on. Each new lot becomes a piece of land of its own, with its own boundaries, its own area and, in most places, its own access to a road and to the networks.

It is not only a drawing exercise. A division has consequences for the planning rules, the services and the neighbours. Before you draw anything, you need to know whether the land can be divided at all, and under which procedure.

What to check before you divide

The rules depend on the country, the region and the municipality, and this guide states none of them. Your local planning department is the place to ask, and it is better to ask before you pay for any drawing. In France, check with your mairie or its urban planning department (service urbanisme).

• The local planning rules for the zone, which may limit the building of a new house, the size of a lot or the distances to the boundaries.
• The access: each lot usually needs a way to a public road, and an easement may be needed across another lot.
• The networks: water, drainage, electricity. Each lot needs a connection, and the cost or the route may decide whether the division is worth it.
• The position of the existing house relative to the new boundary, because a rule on the distance to a boundary can apply after the division.
• The procedure that applies. In France, a division is not always handled the same way: some are covered by a prior declaration, others need a permit. A subdivision without works can be filed as a prior declaration, DP9 in French terminology, and other cases need a permis d’aménager. Which one applies to your case, check with your mairie or its urban planning department.
• Other countries have their own terms: a lot split or minor subdivision in the United States, a land division or subdivision elsewhere in the English-speaking world, and others. Ask your local planning authority which applies.

The role of the surveyor

A sketch is not enough to divide land. A licensed surveyor measures the plot on the ground, sets the boundary markers, calculates the official areas and prepares the division plan that the authority and the registry use. In France that professional is the géomètre-expert. In other countries a licensed land surveyor does the same work.

The surveyor’s areas are the official ones. The area of a lot you sketch in Plan² comes from your drawing, and can differ from the area the surveyor will find. That is why the sketch is the beginning of the conversation, not the end: bring it to the surveyor and to the planning department, and let them tell you what is feasible.

Sketching the division in Plan², step by step

1. Draw or import the plot

   Open Terrain mode and follow the guide: Address, Parcel, House, Around. In France, tap the cadastral parcel. Elsewhere, tap each corner of the plot from your deed or survey, then Finish. A plot in one piece is needed.

2. Place the house

   Place the house on the plot, drag it to its position and turn it. Plan² shows the distance from the house to each boundary. This is the starting point of the division.

3. Start the division

   In the details of the plot, choose “Divide into lots”. The tool asks you to tap the edge of the plot where the cut line starts.

4. Draw the cut line

   Tap the edge where the line starts, then the edge where it ends. The line must cross the plot from one edge to the other. If it does not, Plan² tells you, and you start again. If you want to give up, cancel the cut.

5. Name the lots and read the areas

   The lots get a name (Lot A, Lot B), an area and a colour. You can rename them. Read the area of each lot, and read the distance from the house to each boundary, including the new one.

6. Try other cuts, merge or undo

   If a lot is too small or the house is too close to the new line, merge two lots, or undo the whole division and cut again. Compare the layouts: that is what a sketch is for.

7. Check the access of each lot

   Draw the access of each lot, a driveway or a gate, and check that each one reaches the street. Place the house in its lot, and think about the connections to the networks.

8. Export one sheet per lot

   Choose File, then Export…, pick Site plan, and tick one sheet per lot: each carries the area, the boundaries and the access. Choose PNG or PDF, the paper and the scale. Bring them to the surveyor and the planning department.

Common mistakes when dividing a plot

• Drawing a lot with no access to a road. A lot with no access is rarely usable.
• Cutting the plot so that the existing house stands too close to the new boundary.
• Forgetting the networks: a lot that cannot be connected to water and drainage is hard to build on.
• Treating the sketch as an official document. Only a surveyor’s plan is.
• Taking the areas of the sketch as final. The surveyor’s areas can differ.
• Cutting before checking the planning rules. Ask the authority first.
• Forgetting that the cadastral boundary is indicative, so the real plot may be a little different from the drawn one.

What Plan² does not do

Plan² is not a survey and does not produce a division file. It does not fix a boundary, it does not calculate official areas, it does not check the planning rules, and it does not fill in any application. Lot areas come from your drawing, and only a licensed surveyor produces the legal boundary markers and the division document.

It is a tool to think and to discuss: it lets you try a layout, read the areas and the distances, and bring something clear to the people who decide.