NYC Zoning Handbook:
Residential Districts: R4B
The R4B district designation is intended to preserve and
produce rowhouses that are typical of many of the city's
residential communities. The R4B district also permits
detached and semi-detached houses and zero lot line buildings
but typical development would be two-story, flat-roofed
rowhouses with no front yard parking. Unlike other R4
districts, the maximum building height is 24 feet. The
maximum FAR is 0.9 (the attic allowance does not apply).
The minimum depth of the front yard is five feet. If the
front yards on adjacent zoning lots are deeper than five
feet, the front yard must be at least as deep as one but
cannot exceed the depth of the other adjacent yard. Curb cuts
are prohibited on lots less than 40 feet wide. Front yard
parking is prohibited. One parking space is required for each
dwelling unit.
Basic Data
R4B: Single- or two-family residences, detached, semi-detached or attached
- Minimum lot size:
- Detached: 2,375 square feet lot area; 25 foot lot width
- Semi-detached or attached: 1,700 square feet; 18 foot lot width
- Maximum FAR: 0.9
- Maximum lot coverage: 55%
- Minimum lot area per DU: 970 square feet
- Maximum DUs per acre: 45 Front yard: 5 feet minimum
- Side yards:
- Detached (2 required): 8 feet total (minimum)
- Zero lot line (1 required): 8 feet minimum
- Semi-detached (1 required): 4 feet minimum (8 feet minimum between buildings)
- Maximum building height: 24 feet
- Required parking: One space per dwelling unit except for lots
with single-family houses where curb cuts are prohibited
