London Plot Ratio & Site Coverage Calculator
Check London plot ratio and site coverage against the London Plan density matrix and local borough design policies.
- Suburban Plot Ratio
- 0.5–1.0
- Outer London
- Urban Plot Ratio
- 1.5–2.5
- Inner London
- Site Coverage
- 50%
- Typical cap
Formula & Statutory Rule
Formula
plot_ratio = total_floor_area / site_area
Statutory Rule
site_coverage = footprint / site_area × 100; london_plan_density_matrix = f(PTAL, context)Regional Benchmark Reference
| Jurisdiction / Tier | Rate or Limit | Statutory Note |
|---|---|---|
| Suburban | 0.5–1.0 | Outer |
| Urban | 1.5–2.5 | Inner |
| Coverage | 50% | Typical |
Frequently Asked Questions
What is plot ratio?
Plot ratio is total floor area divided by site area, the London Plan's measure of density.
What is site coverage?
Site coverage is the proportion of the site covered by buildings at ground level.
How does the London Plan use density?
The density matrix relates units per hectare to public transport accessibility and local context.
Do boroughs set their own limits?
Yes. Each borough's local plan sets plot ratio and coverage policies within the London Plan framework.