Do I Need a Permit to Pour Concrete in Idaho?
Quick Answer
Only if it connects to the street, modifies drainage, or is a structural element.
Idaho-specific rules
Adopted code: 2020 Idaho Residential Code (based on the 2018 IRC with Idaho amendments) — the statewide baseline under the Idaho Building Code Act, effective January 1, 2021. Footings, foundations, and structural flatwork are governed by the adopted code's foundation provisions; foundation and footing work is generally permit-triggering under the adopted code even where surface flatwork like a driveway or walkway may not be — confirm with your local building department.
When You Don't Need a Permit
Simple concrete flatwork on your own property — a backyard patio, a walkway, or a small pad — typically does not require a building permit in most cities, as long as it doesn't alter drainage patterns or connect to the public right-of-way.
When You Do Need a Permit
A permit is required for: new driveways or driveway widenings (curb cut modification), sidewalk work in the public right-of-way, any concrete that changes drainage patterns, and structural concrete (retaining walls, foundations). Driveway permits may also require a refundable right-of-way bond ($500-$2,000).
Drainage Is Key
The biggest issue with concrete work isn't the concrete itself — it's drainage. Most cities prohibit directing water runoff onto neighboring properties. If your new concrete changes how water flows on your lot, you may need a drainage plan even for otherwise exempt work.
ADA at the Sidewalk
If your driveway crosses a public sidewalk, the approach must meet ADA slope requirements. This is enforced during the permit process and is a common reason driveway permits are revised.
Bottom Line
Backyard patio? Probably no permit. Driveway or anything touching the street? Yes. Always check drainage impact.
Permit fees by city in Idaho
Verified from each city’s published fee schedule. Where a city has no separate fee listed for this project, open the city page for the current requirements and amount.