Fence Regulations in Ada County, ID (2026)
5 county-level rules, plus city-specific rules for 1 city in Ada County, Idaho.
Verified from official government sources
Height Limits
In unincorporated Ada County, fences may sit inside or outside any setback but cannot exceed six feet above grade on a perimeter boundary or required setback without a variance. On lots one acre or less inside an area of impact, front-yard fences are capped at three feet.
Fence Height Limits in Unincorporated Ada County
Some RestrictionsAda County Code 8-3-6(E)
Fences, walls, latticework, or screens: 1. Are allowed within or outside of any setback, and 2. Shall not exceed a height of six feet (6') above grade on the perimeter boundary or within any required setback area, unless approved by a variance by the Board or as part of an approved use.
Fence Permit Requirements
Ada County Code 8-3-6(F) requires a building permit, with drawings stamped by a licensed engineer or architect, for any fence, wall, latticework, or screen that exceeds six feet in height. The standard six-foot cap applies countywide, drops to three feet in required front yards on small lots within an area of impact, and can rise to twelve feet for public facilities without a variance.
Fence Permit Rules in Ada County
Some RestrictionsAda County Code 8-3-6(D)-(F)
D. Height In Areas Of Impact: On properties one (1) acre in size or less and located within an area of impact, no fence, wall, latticework, or screen shall be erected over three feet (3') in height within the required front yard plane. E. Height On Lot. Fences, Walls, Latticework, Or Screens: 1. Are allowed within or outside of any setback; and 2. Shall not exceed a height of six feet (...
Neighbor Fence Rules
Ada County zoning lets a six-foot fence sit on the perimeter boundary between neighbors, but any sight-obscuring fence near a street corner must not block the clear-vision triangle. Cost-sharing and exact placement of a shared boundary fence are private matters under Idaho civil law.
Shared and Boundary Fence Rules in Ada County
Some RestrictionsAda County Code 8-3-6(B)
Clear Vision Triangle. No sight-obscuring fence, hedge, wall, latticework, or screen shall violate the clear vision triangle requirements (see definition in Chapter 10) at a street intersection.
Retaining Walls
Any retaining wall in unincorporated Ada County with a total vertical height of four feet or more, footing included, must be engineered and permitted under the Ada County Building Code, and walls built as part of hillside grading face additional stabilization, slope and erosion standards under the Hillside Overlay District.
Retaining Wall Permit Rules in Ada County
Some RestrictionsAda County Code 8-2-30(E)(4)
4. Grading And Stabilization: a. All retaining walls with a total vertical height of four feet (4') or more, including footing, shall be designed in accord with the regulations of the Ada County Building Code. b. All slopes that are stabilized by mechanical or chemical means shall conform to the surrounding terrain and shall be given aesthetic treatment that is consistent with the purpose of th...
Material Restrictions
Ada County Code 8-3-6(C) bans barbed wire and electric wire fencing across the unincorporated county unless the property is a farm, sits in the RP, RR, or RUT district, hosts a livestock confinement facility with more than 300 animals, or was approved as security fencing for an approved use. Even then, subsection (H) limits the wire to the top strand, at least six feet above grade.
Barbed Wire Fence Rules in Ada County
Significant RestrictionsAda County Code 8-3-6(C), (H)
C. Barbed Wire/Electric Wire: Barbed wire and electric wire fencing shall only be allowed on properties that meet one or more of the following standards: 1. The property is a "farm," as herein defined; 2. The property is in the RP, RR, or RUT base districts; 3. The property has a livestock confinement facility with more than three hundred (300) animals; or 4. The use of barbed wire an...
Fence Regulations by City in Ada County
1 cities in Ada County have their own fence regulations rules. Each link goes to that city's dedicated page with code citations.
All Ada County ordinances
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