Ada County, ID Fence Regulations: Material Restrictions (2026)

Ada County Code 8-3-6(C) bans barbed wire and electric wire fencing across the unincorporated county except on four categories of property. A parcel qualifies if it is a "farm" as defined in the code, a property meeting Idaho Code Section 63-604 that has obtained an agricultural determination from the Ada County Assessor's Office, if it sits in the RP (Rural Preservation), RR (Rural Residential), or RUT (Rural Urban Transition) base district, if it holds a livestock confinement facility housing more than three hundred animals, or if barbed or electric wire was specifically approved as security fencing for an approved use.

Outside those four situations, including in the county's more urbanized R1 through R8, commercial, or industrial districts, barbed and electric wire are prohibited fence materials entirely. Even where barbed or electric wire is allowed, subsection (H) limits how much of the fence can carry it: security fencing that is not tied to an agricultural use, a public facility, or a livestock confinement facility may only use barbed or electric wire as the top strand, and that strand must start at a minimum of six feet above grade, so a resident cannot run barbed wire along a standard four-foot perimeter fence.

The section's purpose clause at 8-3-6(A) frames these fence standards, together with the six-foot general height cap in (E) and the clear vision triangle rule in (B), as part of Chapter 8-3's general development standards that apply to all unincorporated Ada County property, not only projects going through master site plan review. The rule took effect with the county's Title 8 rewrite on October 28, 2025 under Ordinance 1002, replacing the prior fence chapter numbering.