In unincorporated LA County, decks not more than 30 inches above grade and not over any basement or story below are exempt from building permits. Elevated decks, covered patios, and attached patio covers require permits from the DPW Building and Safety Division.
Under the California Building Code (as adopted by LA County in Title 26), decks, walks, and driveways not more than 30 inches above adjacent grade at any point and not placed over any basement or story below are exempt from building permits. Decks above 30 inches require a building permit and must meet structural, setback, and guardrail requirements (42-inch guardrails required for decks 30+ inches above grade). Covered patios and patio covers (pergolas with roofing) are considered structures and require permits. Setback requirements apply — typically 5 feet from property lines for accessory structures. In hillside areas, additional geotechnical review may be required. Patios at or near grade level (concrete slabs, pavers) generally do not require permits unless they affect drainage or are part of a larger project.
Building an elevated deck without a permit may result in a stop-work order, required engineering review, double permit fees, or mandatory demolition if it cannot meet code.
See how Norwalk's deck & patio permits rules stack up against other locations.
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