New Haven, CT Building Setbacks & Zoning: Lot Coverage Limits (2026)

The zoning ordinance sets two separate lot-coverage ceilings for every residential district, and RS-1 uses the strictest pairing in the code. Section 11(a)(1)c caps "Maximum building coverage" for principal and accessory buildings combined at 30 percent of lot area, and Section 11(a)(1)g adds a second, broader "Maximum impervious surface coverage" limit of 70 percent that also counts driveways, parking pads and walkways, not just roof footprint. 5), RM-1 and RM-2 hold at 30 percent (Sections 13 and 14), RH-1 and RO are capped at 25 percent, and RH-2 allows up to 50 percent, all summarized in the citywide bulk table at Section 20, Table 2.

Table 2's own footnote 3 explains the tradeoff built into the ordinance: "Variable. Lower building coverage permits a higher floor area ratio (FAR)," so a developer who builds a smaller footprint can add height or floor area elsewhere on the lot. The Article I definition of BUILDING COVERAGE (Section 1) excludes structures below finished lot grade, "including shelters for nuclear fall-out," from the building-coverage count, but that exclusion does not extend to the separate impervious-surface figure, which still counts at-grade paving. Compliance is checked at the building-permit stage: the Zoning Enforcement Officer in the Office of Building Inspection and Enforcement (OBIE) must certify that submitted plans meet these coverage limits before a permit or certificate of occupancy issues under Section 62.