Is an Engineer Stamp Required for My Deck Project in Arizona?

Arizona cities — Phoenix, Tucson, Mesa, Scottsdale — review structural drawings for decks, and the PE seal is the standard requirement for non-prescriptive decks. The seal must show the engineer's name, Arizona PE number, and date, and the engineer must be in responsible charge of the engineering. Elevated decks, rooftop decks, and decks with shade structures are treated the same at the structural level. Owner-builders don't escape the requirement: the building department asks for the seal regardless of who drafted the plans.

The engineer reviews the deck plan and elevations, designs the footings for expansive desert soils, sizes beams, joists, and posts, and checks the ledger connection to the house per the adopted code. Monsoon wind design is checked for the deck and any shade structure. Pergolas and ramadas add uplift loads that prescriptive tables don't cover. Bring the site survey, the geotechnical report, and the deck plans. Soil movement design is the item most deck plans miss.

Use this checklist before engaging an engineer for your deck: • Engineer of record holds an active Arizona PE license, verifiable on the state roster • Dimensioned deck plan and elevations ready for structural review • Site survey showing setbacks, easements, and existing structures • Geotechnical report addressing expansive desert soils for the lot • Ledger connection to the house detailed and verified • Footings designed for soil movement, not just bearing capacity • Engineer confirms they'll respond to plan-check corrections on sealed sheets • Seal shows name, Arizona PE number, and date on every sealed sheet