Work out setback requirement instantly with clear inputs, formula shown and shareable results.
The buildable envelope is the plot less its setbacks: two side setbacks off the width, and the front plus rear setbacks off the depth. On narrow plots the side setbacks alone can consume most of the width, which is why the resulting coverage percentage is often far below the permitted maximum.
Buildable envelope
Width = plot width - 2 x side setback; depth = plot depth - front - rear setback
Coverage
Coverage percent = buildable area / plot area x 100
Preliminary estimate only. Setback requirements vary by zone, road width and building height and must be confirmed with the local planning authority.
Width = plot width - 2 x side setback; depth = plot depth - front - rear setback. The buildable envelope is the plot less its setbacks: two side setbacks off the width, and the front plus rear setbacks off the depth.
Often yes. Many codes increase the side and rear setback as height rises, so a tall building on a small plot loses envelope with every extra storey.
This calculator takes 4 inputs: Plot width, Plot depth, Front setback, Side and rear setback. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.