Before You Build in New York, NY: Permit & Rule Checklist (2026)

In NYC residence districts, Zoning Resolution §23-44 limits fences in front yards to 4 feet above adjoining grade and permits walls up to 8 feet (not roofed and not part of a building) as obstructions in required yards. On corner lots, a fence up to 6 feet is allowed within the portion of one front yard between the side lot line and the prolongation of the side wall of the residence. Side and rear yard fences are typically capped at 6 feet by Department of Buildings practice. Fences generally do not need a permit but must comply with zoning and Building Code Chapter 32.

NYC Building Code and Health Code require all swimming pools to have barriers at least 4 feet high with self-closing, self-latching gates. The NYC DOHMH regulates pools under Article 165 of the Health Code. Pool barriers must prevent uncontrolled access by children under 5.

Retaining walls in NYC are regulated under the NYC Building Code (Title 28) and require DOB permits when exceeding certain height thresholds. Walls over 4 feet require professional engineering and DOB approval. NYC has seen increased enforcement since building collapses related to retaining wall failures.

NYC Building Code Section BC 3109 governs swimming pool barriers in all five boroughs. Private residential pools require a barrier at least 48 inches (4 feet) high above grade with no more than 2 inches of clearance at the bottom and openings that will not pass a 4-inch sphere. Public pools must be enclosed by a barrier at least 6 feet high. Gates must be self-closing and self-latching, open outward away from the pool, with the latch handle on the pool side at least 40 inches above grade. The NYC Health Code also regulates residential pools through the Department of Health and Mental Hygiene (DOHMH).

Above-ground pools in NYC must comply with Building Code barrier requirements (BC 3109) and Health Code Article 165. Pools deeper than 24 inches require a 48-inch barrier with self-closing gate. Pools accessible to multiple families require a DOHMH permit. DOB permits may be required for structural support or decking.

Hot tubs and spas in NYC are regulated under Health Code Article 165 if they serve multiple dwelling units. Residential hot tubs for single-family use have minimal city regulation but must comply with electrical code (NEC Article 680). GFCI protection is required for all hot tub electrical connections.

New York City legalized ADUs on one- and two-family lots in December 2024 through Local Law 126 of 2024 (basement/cellar legalization pilot) and Local Law 127 of 2024 (new ADU standards), enacted alongside the City of Yes for Housing Opportunity zoning text amendment. ADUs are capped at 800 square feet of zoning floor area, limited to one ADU per lot, and require owner-occupancy on the same lot. Backyard ADUs are prohibited in FEMA Special Flood Hazard Areas, DEP 10-Year Rainfall Flood Risk Areas, historic districts, and certain low-density zones (R1-2A, R2A, R3A) outside the Greater Transit Zone.

Carports in NYC require DOB permits and must comply with the Zoning Resolution's setback, lot coverage, and open space requirements. In most residential districts, carports count as lot coverage and must meet side and rear yard setbacks. Building Code structural requirements apply.

Tiny homes face significant regulatory barriers in NYC. The Building Code sets minimum room sizes (120 sq ft for a living room, 80 sq ft for a bedroom). The Zoning Resolution generally does not permit standalone dwelling units on lots zoned for single-family use. Tiny homes on wheels are classified as vehicles and cannot serve as permanent dwellings.

NYC Parks Department regulates all street trees and trees in parks. Removing or damaging a city street tree without authorization violates Admin Code §18-129 and carries fines up to $15,000 per tree. Private property trees over 6 inches DBH in certain zones require Parks Department permits under Local Law 3 of 2010.