Calculadora de Retiro y Área Construible Gratis
Calcula el área construible después de aplicar los retiros requeridos por la normativa de zonificación.
Buildable Area (footprint)
4,425
Buildable Area (footprint) vs Lot Width (feet)
Fórmula
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
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:
Ejemplo Resuelto
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
Preguntas Frecuentes
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.