A setback is the mandatory distance a building must keep from its lot lines: front, sides, and rear. Setbacks shape the buildable footprint before any design begins, and in small-lot zoning they often decide more about what fits than the headline density number does. Miami 21 sets them by transect, with extra rules where a lot faces a more protected zone.
Buildable footprint=(Lot width − Side setbacks) × (Lot depth − Front setback − Rear setback)
- Lot width, depth
- The parcel's dimensions as surveyed.
- Setbacks
- The minimum distances required for the parcel's transect in the current adopted Miami 21, measured from the lot lines.
- Buildable footprint
- The area available at grade, before parking, stairs, and required open space are placed.
- It shapes the footprint before an architect draws anything. On small lots it decides more than the density number does.
- Blind to what has to fit inside that footprint. Parking, stairs, and open space still take their share of it.
- A lot facing a more protected transect can carry a deeper setback on that side alone, so two identical lots hold different buildings.
A standard Little Havana lot, 50 by 150, with a 10-foot front, 5-foot sides, and a 20-foot rear.
Sixty-four percent of the lot, before parking and open space take theirs. The rest was decided by four numbers nobody negotiates.
Related terms
All termsFLR (Floor Lot Ratio)
Floor lot ratio caps how much building area a parcel can carry: lot size multiplied by the ratio equals maximum buildable area.
DevelopmentDevelopment Envelope
The development envelope is the three-dimensional shape a parcel's rules allow: the volume left after height limits, setbacks, density caps, parking requirements, and lot coverage have each taken their bite.
DevelopmentLand Residual Value
Land residual value is what a developer can rationally pay for a site: the value of the finished project, minus every cost to build it, minus the profit the risk demands.
Terms arrive with the writing.
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