Lot Coverage Calculator
Check buildable area, maximum footprint and floor area ratio against zoning setbacks, coverage limits and impervious-surface rules.
- US Suburban
- 35%
- Typical coverage cap
- US FAR
- 1.28
- R-1 baseline
- Impervious Cap
- 45%
- Stormwater limit
Formula & Statutory Rule
Formula
coverage_pct = footprint / lot_area × 100
Statutory Rule
FAR = total_floor_area / lot_area; envelope = (W − setbacks) × (D − setbacks)Regional Benchmark Reference
| Jurisdiction / Tier | Rate or Limit | Statutory Note |
|---|---|---|
| R-1 Suburban | 35% / 1.28 | Coverage / FAR |
| R-2 Duplex | 45% / 1.60 | Coverage / FAR |
| MU Mixed Use | 70% / 3.00 | Coverage / FAR |
Frequently Asked Questions
What is lot coverage?
Lot coverage is the percentage of a plot covered by buildings and other impervious surfaces.
How does FAR differ from coverage?
Coverage limits footprint on the ground; FAR limits total floor area across all storeys.
Do setbacks reduce buildable area?
Yes. Front, rear and side setbacks shrink the buildable envelope before coverage and FAR are applied.
What counts as impervious surface?
Roofs, driveways, patios and any hard surface that prevents water infiltration.