Jurisdiction directory

Idaho home project permits by county

Many Idaho households live outside city limits, where the county building department — not a city — issues the permit. 6 Idaho counties, covering the state's largest jurisdictions, are inventoried here.

Model reviewed August 2026

Counties covered

largest jurisdictions first

Municipalities tracked

in Idaho

Population covered

1.3M

residents in listed counties

Code basis

Statewide

Idaho Residential Code, based on the IRC

Featured counties

The largest and most active permit jurisdictions in the state.

Ada County511,931 residents · seat Boise Canyon County250,625 residents · seat Caldwell Kootenai County179,789 residents · seat Coeur d'Alene Bonneville County128,105 residents · seat Idaho Falls Twin Falls County92,696 residents · seat Twin Falls Bannock County88,532 residents · seat Pocatello

All Idaho counties we cover

6 counties, largest first.

Ada CountySeat: Boise · 511,931 residents Canyon CountySeat: Caldwell · 250,625 residents Kootenai CountySeat: Coeur d'Alene · 179,789 residents Bonneville CountySeat: Idaho Falls · 128,105 residents Twin Falls CountySeat: Twin Falls · 92,696 residents Bannock CountySeat: Pocatello · 88,532 residents

Sources

Sources & verification

Idaho Division of Building Safety

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.