Before You Build in Mount Vernon, NY: Permit & Rule Checklist (2026)

All residential pools must have a barrier at least 48 inches high with self-closing, self-latching gates per NYS Residential Code Appendix G. A pool alarm is required for pools built or substantially modified after Dec 14, 2006.

Retaining walls over 4 ft measured from bottom of footing to top of wall require a building permit and sealed engineered drawings. Walls with surcharge (driveway, pool, building above) require engineering at any height.

NY Real Property Law Sec. 840 governs boundary fences between adjoining owners and allows shared cost arrangements. Mount Vernon does not impose its own cost-sharing rule; disputes are civil matters.

Typical Mount Vernon residential zoning allows fences up to 4 ft in front yards and 6 ft in rear and side yards. Corner lots have sight-triangle limits to protect intersection visibility.

A building permit from the Mount Vernon Building Department is required for most new fences and for replacements that change height, materials, or location. Simple in-kind repairs of existing fences generally do not require a permit.

All residential pools in Mount Vernon require a Building Department permit, zoning review for setbacks, plus separate electrical and, if applicable, plumbing permits.

Hot tubs and spas are treated as pools under NYS Residential Code when over 24 inches deep, but a locking safety cover meeting ASTM F1346 satisfies the barrier requirement.

Pool barriers follow NYS Residential Code Appendix G: 48-inch fence, self-closing/self-latching gate opening away from pool, latch 40+ inches high.

Above-ground pools over 24 inches deep require a Mount Vernon Building Department permit and must meet NYS Residential Code Appendix G barrier rules.

Pools built or substantially modified after December 14, 2006 must have a NYS-compliant pool alarm under Exec Law §387(14) and 19 NYCRR §1228.2.

Converting a garage to living space in Mount Vernon requires a building permit, zoning compliance, and replacement off-street parking where parking is required.

Mount Vernon zoning does not broadly authorize detached accessory dwelling units in single-family districts; New York has no statewide ADU preemption.

Sheds are accessory structures under the Mount Vernon Zoning Code — must meet accessory-structure setbacks and typically require a permit if over 144 sq ft or permanently placed.

Mount Vernon has no tiny-home-specific ordinance. Any permanent tiny house must meet NYS Uniform Code minimums, zoning dwelling definitions, and all setback/coverage rules.

Carports are accessory structures requiring a Mount Vernon building permit and must meet the same setback and coverage rules as other accessory structures.

Small contained recreational fires using clean dry wood or charcoal are generally allowed if under 3 ft high and 4 ft diameter, attended at all times, and kept well away from structures. Mount Vernon's tight lot spacing makes safe fire pit use difficult.

Open burning of brush, leaves, or trash is prohibited in Mount Vernon. The city's extreme density (4 sq mi, 73,000 residents) means no open burning is practical. NY DEC Part 215 also bans residential brush burning March 16 to May 14 statewide.

Mount Vernon requires permits to remove street/public trees. Private property tree removal is less regulated but must comply with Chapter 222 (Trees) provisions.

Mount Vernon DPW controls trimming of street trees and trees in public right-of-way. Private tree trimming on your own property is generally unrestricted.

Mount Vernon receives water via NYC DEP (Catskill/Delaware system). No permanent outdoor watering restrictions, but drought emergencies may trigger NYC DEP or NY DEC statewide limits.