What counts toward lot coverage?

Most zoning codes count the footprint of all structures — main house, garage, covered patios, accessory dwelling units, and sometimes driveways or impervious surfaces. Check your local ordinance; this calculator uses the footprint total you enter.

What is a typical maximum lot coverage?

Residential zones commonly cap coverage at 25–50%. Commercial zones can allow 60–80% or more. The exact limit is set by your municipality's zoning code and varies by zone designation.

Is lot coverage the same as floor area ratio (FAR)?

No. Lot coverage measures how much of the lot is covered by structures (horizontal). FAR measures total floor area across all stories relative to lot area (vertical). A two-story house doubles FAR but not lot coverage.

Can I use square meters instead of square feet?

Yes. The ratio is unit-neutral — as long as both measurements use the same unit, the resulting percentage is correct.

What if I exceed the zoning limit?

Exceeding the limit typically means you cannot build or must reduce the footprint. In some cases you can apply for a variance, but approval is not guaranteed. Consult a local land-use attorney or planner.

Lot Coverage Calculator

Enter your building footprint and lot area to instantly get your lot coverage ratio and see whether it meets your local zoning limit.

Enter Measurements

Unit

Total Lot Area (sq ft)

Building Footprint Area (sq ft)

Ground-floor outline of all structures (house, garage, sheds, covered patios).

Zoning Maximum Coverage (%) — optional

Lot Coverage Ratio

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0% 100%

Summary

Lot coverage is the percentage of a parcel's total area occupied by building footprints and other structures. Most zoning codes cap it at 30–50% for residential lots. This calculator takes your building footprint area and total lot area, computes the ratio, and flags whether you are within a coverage limit you specify.

How it works

Enter the total area of your lot (square feet or square meters).
Enter the building footprint area — the ground-floor outline of all structures on the lot.
Optionally enter your local zoning maximum coverage percentage.
The calculator divides footprint by lot area and multiplies by 100 to get your coverage ratio.
A compliance indicator shows whether your ratio is under, at, or over the zoning limit.

Use cases

Check whether a planned addition or new structure will exceed your zoning lot coverage limit.
Estimate how much additional building area is still allowed on a parcel.
Compare coverage across multiple lots when evaluating investment properties.
Verify a seller's lot coverage claim before closing on a property.
Help architects and builders stay within permitted footprint during early design.
Understand remaining buildable area before applying for a building permit.

Frequently Asked Questions

Last updated: 2026-10-05 · Reviewed by Nham Vu