A deck permit generally covers construction of an attached or freestanding elevated platform and its structural components, including footings, posts, beams, joists, ledger connections, stairs, and guards. Whether a building permit is required depends heavily on local rules. Some jurisdictions exempt small, low, freestanding decks, while attached decks, higher decks, roof decks, or structures in sensitive locations commonly require review.
Height, size, and attachment to the house are frequent permit triggers, but the thresholds are not uniform. Seattle requires permits for decks more than 18 inches above grade and applies additional review to taller, larger, roof, or environmentally sensitive-area decks. Austin exempts certain unattached residential decks under 200 square feet and less than 30 inches high when they are outside flood hazard areas. Minneapolis similarly exempts certain freestanding decks below 30 inches, while San Diego requires a permit when a residential deck exceeds specified area or height thresholds, is attached to the dwelling, or serves the main exit.
Zoning rules can matter even when the structure itself qualifies for a building-code exemption. Local requirements may regulate setbacks from property lines, lot coverage, placement in front or rear yards, environmentally sensitive areas, flood zones, easements, and historic districts. A deck close to a property line or carrying concentrated loads such as a hot tub may also require additional structural documentation or professional engineering.
Permitted decks are reviewed for structural safety. Common issues include footing size and depth, beam and joist spans, connections to the dwelling, decay-resistant materials, stairs, handrails, and guards. Depending on the jurisdiction and permit type, inspections may occur before concrete is placed, before framing is concealed, and after construction is complete.
Select a city-specific deck permit guide to confirm the local exemption thresholds, zoning setbacks, required drawings, structural standards, inspections, and any special site reviews that apply to your property.