State Guide · Verified 2026
Fence Installation Permits in Idaho
Fences are governed mainly by local zoning, not a statewide building permit. Cities set height limits (commonly 3-4 ft in front yards and 6 ft in back and side yards), setbacks, and corner sight-line rules, and many require a zoning permit for any fence. Most jurisdictions exempt fences up to 7 ft from a building permit (IRC R105.2) and require one above that. Replacing a fence at the same height, material, and location usually needs no permit; a fence used as a pool barrier always does.
The Building Code in Idaho
Idaho statewide residential code (2018 IRC-based), adopted by state statute
Idaho adopts the IRC through Idaho Code, meaning new code editions require legislative approval rather than simple agency rulemaking, a slower process than most states use. Local governments choose whether to enforce the code themselves; where none does, the state Division of Occupational and Professional Licenses (DOPL) steps in directly. The statewide baseline exempts fences 7 feet or under from a building permit, but cities are free to require their own permit process on top of that baseline, and several do.
Quick Facts
Who Sets the Rules
The 7-foot baseline is a floor, not a ceiling on local authority
Idaho's statewide exemption means a fence under 7 feet cannot be required to carry a building permit purely because of state law, but it does not stop a city from adding its own permit requirement. Boise requires a fence permit from Planning and Development Services for essentially all new fence construction, regardless of the state baseline.
Ada County goes the other way
Surrounding Boise, unincorporated Ada County does not require a building permit for installing a fence at all, according to its own Development Services materials, though zoning standards for height and placement still apply. Some secondary sources describe a 6-foot trigger for Ada County specifically; our review of the county's own primary materials found no such threshold stated, so treat that figure as unconfirmed until you check directly with the county.
Kootenai County's opt-out is genuinely unusual nationally
Kootenai County, home to Coeur d'Alene and Post Falls, allows owners of buildable residential parcels to construct single-family homes and accessory structures without obtaining a building permit at all, provided they still obtain a location permit confirming zoning and setback compliance. This reflects a strong private-property-rights approach that few other counties in the country have adopted for general residential construction.
Boise's own height and material rules
Boise caps solid front-yard fences at 36 inches, though open-vision fences, where gaps are at least half the slat width, can reach 48 inches in front. Rear and side yards allow up to 72 inches. Barbed wire is limited to commercial and industrial zones as the top strand of a security fence at minimum 72 inches, and is common and legal in rural agricultural areas outside city limits under Idaho's lawful fence statutes.
The statewide boundary fence statute
Idaho Code Title 35 governs shared boundary fences statewide, including a specific notice requirement: Idaho Code 35-111 requires giving a neighbor six months' written notice before removing your portion of a shared partition fence, protecting the other landowner's time to arrange a replacement.
What people get wrong
The most common mistake is assuming the statewide 7-foot exemption means no city can require a permit for a shorter fence. Boise proves otherwise. The second is assuming Kootenai County's opt-out applies to fences specifically; it applies to the broader residential building permit process, and the county still requires a location permit either way.
Counties With Their Own Rules
These Idaho counties have verified, county-specific fence installation rules that differ from the state baseline:
Check Your County
Select your county for the local rule, fees, and your building department's contact details:
Building It Yourself? Here's What You'll Need
Popular tools and materials homeowners use for a fence installation project:
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Official Sources
Rules change and cities within a county may differ. This guide is general information, not legal advice — always confirm with your local building department. Reviewed by the StateDataIndex Editorial Team · Updated September 2026.