Do I need a permit for an attached deck in
Lynbrook, New York?

Lynbrook attached deck permits — the key details

New York State Building Code Article 3 (based on 2020 IBC) mandates permits for any deck attached to a structure, with no square-footage or height exemption. IRC R105.2 exempts only detached, ground-level decks under 200 sq ft and under 30 inches—but the moment your deck ledger bolts to your rim band, Lynbrook's Building Department requires a permit application, site plan, and plan review. The ledger attachment is the trigger: fasteners, flashing, and rim-band loads must be shown on sealed plans (by a PE or architect) or a detailed contractor plan with calculations. Lynbrook does allow owner-builder permits for owner-occupied residential work, but the site plan and ledger detail must still meet code. The application requires: completed Building Permit Application (available from Lynbrook Building Department), site plan at 1:40 scale or larger showing property lines, deck footprint, and setback distances, framing plan showing ledger attachment detail (IRC R507.9—membrane flashing, fastener spacing, bolts at 16 inches on-center), footing schedule with depth exceeding local frost depth (42–48 inches), guardrail and stair details if applicable, and proof of homeownership or authorization. Plan review turnaround is typically 2–3 weeks; the Department checks frost depth compliance, ledger flashing per state code, guardrail height (36 inches minimum, 42 inches if deck serves a door 36 inches above grade per IBC 1015), and stair rise/run compliance per IRC R311.7.