Building Permits in Idaho

We cover 20 cities in Idaho. Select a city below to see local permit requirements.

20 Cities Covered

2,101 Permit Rules

IRC Building Code Base

Building Codes in Idaho

Building permit requirements in Idaho are enforced at the local level, each city and county building department sets its own rules, fees, and timelines. Most cities in Idaho follow the 2018 IRC.

We cover 20 cities in Idaho with 2,101 specific permit rules. That's real, locally researched data, not generic advice. Each city page shows exactly what triggers a permit, what's exempt, estimated fees, and how to apply.

The bottom line: don't assume your city follows the same rules as the one next door. A fence that's exempt in one town might need a full permit two miles away. Always check your specific city.

Permit Fees Across Idaho

Across the 20 cities we cover in Idaho, permit fees range from $25 – $5,000. The average sits around $127 – $523.

Fees vary a lot by city and project type. A simple fence permit might run you $50, while a full room addition could be $2,000+. Most cities calculate fees based on your estimated project value, typically 1–2% of construction cost. Check the specific city page for accurate numbers.

Common Permit Exemptions in Idaho

These are the most common projects that don't require a permit across cities in Idaho. Keep in mind, "exempt from a permit" doesn't mean "exempt from code." You still have to build to code even without a permit.

Fence: Exempt in 40 of our 20 covered cities

Windows and Doors: Exempt in 35 of our 20 covered cities

Siding: Exempt in 21 of our 20 covered cities

Patio: Exempt in 21 of our 20 covered cities

Tree Removal: Exempt in 20 of our 20 covered cities

Exemptions vary by city. Always verify with your local building department before starting work.