Deck permits in the Treasure Valley

Deck permit rules are set city by city, and the Treasure Valley's cities don't agree. Boise and Nampa use a 12-inch height trigger, Meridian looks at size, attachment and exit doors, and Eagle and Caldwell review decks through their own checklists. Each guide quotes the jurisdiction's own wording, links the official page, and flags anything we could not confirm so you know what to ask.

• Boise, ID Deck Permit Rules (2026)

  Yes, if the deck surface sits more than 12 inches above grade. The City of Boise requires a building permit for any deck or concrete patio over 12 inches, which is stricter than the 30-inch figure in many online guides. Attached patio covers need a permit at any size, and historic-district lots need a Certificate of Appropriateness first.

• Meridian, ID Deck Permit Rules (2026)

  Meridian requires a building permit for a deck that is over 200 square feet, attached to the house, more than one story, or serving a required exit door. A detached deck of 200 square feet or less, no more than 30 inches above grade and not serving an exit door is exempt, though setbacks and HOA rules still apply.

• Nampa, ID Deck Permit Rules (2026)

  Nampa requires a building permit for a deck more than 12 inches high. The city reviews residential plans to the 2018 International Residential Code, so expect to submit a site plan and construction drawings. Like Boise, Nampa sets the bar well below the 30-inch exemption found in the model code and in many generic permit guides.

• Eagle, ID Deck Permit Rules (2026)

  Treat any Eagle deck as permit work until the Building Department tells you otherwise. Eagle's residential checklist asks for deck location, construction and ledger-connection details, and the city has not published a low-deck exemption like Boise's 12-inch rule. Its own FAQ says never guess whether you need a permit: call the Building Department first.

• Caldwell, ID Deck Permit Rules (2026)

  Yes. The City of Caldwell states that additions, porches, carports and decks require separate permits and inspections. The city's inspection page doesn't publish a height or size exemption for decks, so confirm with the Building Safety Division before building even a low platform, and plan for inspections scheduled through Caldwell's inspection line.