Denver, CO Permit Requirements: Deck & Patio Permits (2026)

Denver's Community Planning and Development requires building permits for deck construction, particularly for elevated decks. Patios and flatwork at grade level that do not involve structural components generally do not require building permits. Decks attached to the house require proper ledger board connections, footings, and structural framing per the adopted International Residential Code. Free-standing decks may have different requirements. All decks 30 inches or more above grade require guardrails at least 36 inches high with balusters spaced no more than 4 inches apart. Decks count toward lot coverage limits as defined by the zone district. Setback requirements apply to deck construction. Denver offers specific guidance for residential decks, porches, patios, pergolas, and carports through CPD. Permit applications can be submitted online through Denver's e-permits system. Plan review is typically required for elevated decks, with review times varying based on project complexity. Decks in historic districts may require additional Landmark Preservation review.