Canyon County, ID Accessory Structures: Shed & Carport Rules (2026)

Canyon County's zoning code does not carve out a separate 'shed' category; a shed is an accessory structure (building), defined at § 07-02-03 as a structure that is subordinate and incidental to the principal structure or use on the same parcel. Height Regulations Table 3, at Canyon County Code § 07-10-21(3), sets the accessory-structure ceiling by zone: 35 feet in the Agricultural Zone A and in Residential Zones R-R, R-1 and R-2 (the same ceiling that applies to the main house), rising to 50 feet in Commercial Zones C-1, C-2 and MU-A, and 75 feet in Industrial Zones M-1 and M-2.

A shed also has to sit within the same front, side, rear and corner setbacks Table 1 sets for its zone under § 07-10-21(1), because the setback rule applies to any building or structure without an accessory-building exception. Before pouring a slab or erecting walls, the property owner needs a building permit from the Development Services Department under Canyon County Code § 06-01-09(1); the miscellaneous-exceptions list in that same section excuses only minor repair items like cabinetwork, floor covering and painting, not new accessory buildings, so a shed of any size still needs a permit unless the Director specifically designates it exempt, the way ornamental windmills and flagpoles already are.

Sheds used solely for parking, access or storage in a mapped flood hazard area face additional elevation or floodproofing rules under Article 10A rather than these general standards. None of this reaches Caldwell, Nampa or the county's other cities, each of which sets its own accessory-structure rule.