Calcolatore Arretramento e Area Edificabile
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Buildable Area (footprint)
4,425
Buildable Area (footprint) vs Lot Width (feet)
Formula
## Setback & Buildable Area Setbacks are the minimum required distances between a building and the property lines. They create the "buildable envelope" that constrains where a structure can be placed on a lot. ### Setback Types - **Front setback**: Distance from the front property line (street-facing), typically 15-30 ft - **Rear setback**: Distance from the rear property line, typically 15-25 ft - **Side setback**: Distance from each side property line, typically 5-15 ft - **Corner lots**: May have two front setbacks ### Calculating the Buildable Envelope **Buildable Width = Lot Width - (Side Setback x 2)** **Buildable Depth = Lot Depth - Front Setback - Rear Setback** **Buildable Area = Buildable Width x Buildable Depth** ### Additional Constraints Setbacks define the maximum footprint, but the actual building may be smaller due to: - Lot coverage limits - Floor area ratio (FAR) limits - Parking requirements - Building height restrictions
Esempio Risolto
75 x 120 ft lot with 25 ft front setback, 20 ft rear setback, 8 ft side setbacks, planning a 2-story home.
- 01Total lot area: 75 x 120 = 9,000 sq ft
- 02Buildable width: 75 - (8 x 2) = 59 ft
- 03Buildable depth: 120 - 25 - 20 = 75 ft
- 04Buildable area: 59 x 75 = 4,425 sq ft
- 05Buildable as % of lot: 4,425 / 9,000 = 49.2%
- 06Max floor area (2 stories): 4,425 x 2 = 8,850 sq ft
Domande Frequenti
Can I build into the setback area?
Generally no. Building within setbacks requires a variance from the zoning board. Some exceptions may apply for minor encroachments like eaves, bay windows, or uncovered porches. Underground structures like basements may extend into rear setback areas in some jurisdictions.
Are setbacks measured from the property line or the curb?
Setbacks are measured from the property line, not the curb or sidewalk. The property line may be different from where the curb is. Always verify your exact property boundaries with a professional land survey before designing a building.
Do corner lots have different setbacks?
Yes. Corner lots typically have front setbacks on both street-facing sides, which significantly reduces the buildable area. The side that abuts the more major street often has the larger setback. Some codes provide reduced corner lot setbacks to partially offset this disadvantage.