How to Divide a Lot: Rules, Survey and a Sketch of the Lots

What dividing a lot means

Dividing a lot means turning one parcel into two or more, each of which can be owned, sold and built on separately. Depending on where you live and on the project, it is called a lot split, a minor subdivision or a subdivision, and the names and the thresholds are set locally.

It is more than a line on a drawing. A new lot has to meet the rules of the place: a minimum size, a minimum width at the street, access to a public road, and a connection to water, sewer and power. The house that already stands must still respect its setbacks to the new lot line. The division is legally real only after the local authority approves it and the new lots are recorded.

That is why the sketch comes first. It tells you in an evening whether the idea is plausible, before you spend on a survey and an application.

What to check before you draw a line

The rules are local, so this guide gives no figures. Ask your planning department, or the department that handles lot splits in your city or county, what applies to your property.

• The zoning of the lot: minimum lot size and width, what can be built, and the setbacks for each lot.
• Whether a division is allowed at all, and which process it follows: a simple lot split, a minor subdivision or a full subdivision, which depends on the number of lots and on the place.
• Access: each new lot needs a way to the street, by its own frontage or by an easement, and the department may have rules on both.
• Utilities: water, sewer or septic, power and drainage for each lot, and who pays to extend them.
• Covenants and the homeowners association, if there is one: they may forbid a division even where the city allows it.
• Existing buildings, trees, easements and any septic system, which must still work after the line is drawn.
• Fees, delays and the documents to submit: ask for the checklist.

Ask in writing if you can. A clear answer from the department is worth far more than a guess.

The role of the licensed surveyor

Only a licensed land surveyor can measure the lot on the ground, set the new corners and produce the survey or the plat the department and the county record. The areas that count are theirs, not the ones on a sketch.

A surveyor can also tell you early what is feasible. They know the records, the easements and the way the local department reads its rules. A short conversation with a surveyor, with your sketch in hand, is often the best first expense.

Plan² does none of that. Its lots are a drawing, with areas computed from the lines you drew, to think and to discuss.

Sketching the lots in Plan², step by step

1. Open Terrain mode and draw the lot

   Open Layers and choose Terrain mode, then follow the guide: Address, Parcel, House, Around. Draw the lot by tapping each corner, from your plat, deed or survey, then tap Finish. In France you can import the cadastral parcel instead.

2. Place the house and the access

   Place the house where it stands, then draw the street and the access. A division is judged on where the house is and on how each lot reaches the street, so put them in first.

3. Divide into lots

   Choose Divide into lots, then tap on the edge of the property where the cut line starts and again on the opposite edge, where it ends. The line must cross the property from one boundary to another.

4. Name the lots and read the areas

   Each lot gets a name, Lot A, Lot B and so on, a color and an area. You can rename them. Compare the areas with the minimum size your department sets.

5. Read the distances to the house

   Plan² shows the distance from the house to each boundary of its lot, so you can see whether the new line leaves the house far enough from it, according to the setbacks you asked about.

6. Try other cuts

   Cancel the cut and draw another, or merge two adjoining lots. Compare the options: a cut parallel to the street, a flag lot with a narrow access, or a cut that leaves the house a bigger yard.

7. Give each lot its access

   Check that each lot touches the street, or draw the access that serves it, and place the connections to the networks for each one. A lot with no way in is a lot you cannot build on.

8. Export one sheet per lot

   Choose File, then Export…, pick Site plan and PNG or PDF, and choose the scale from 1:50 to 1:500. The export gives one sheet per lot, with its area, its boundaries and its access, and you can add the map backdrop. Bring them to the surveyor and to the department.

Mistakes to avoid

• Taking the sketch areas as official. They come from your drawing: only a survey fixes them.
• Cutting the lot without checking the minimum size and width, or the setbacks of the house to the new line.
• Leaving a lot with no access to the street.
• Forgetting utilities, easements and the septic system when the line is drawn.
• Ignoring covenants or the association, which may forbid what the city allows.
• Selling or promising a lot before the division is approved and recorded.

What Plan² does not do

Plan² does not check a division against the zoning, does not fix a boundary, does not produce a plat or a division file and does not replace a licensed surveyor. The lots are a sketch, and their areas come from the drawing. What Plan² does is let you see the idea and share it: lot areas, distances to the house and a sheet per lot, so that the conversation with the surveyor and the department starts from something concrete.