Accessory Structures in Caldwell, ID (2026)
3 verified accessory structures rules for Caldwell, Idaho, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Caldwell allows accessory dwelling units as an accessory use under Section 10-12-03-1, requiring compliance with the International Building and Fire Codes, a minimum 3-foot setback from interior and rear lot lines, and the height limit of the underlying zoning district's dimensional table.
Caldwell Accessory Dwelling Unit Zoning Rules
Some RestrictionsCaldwell City Code § 10-12-03-1(2)(C)(6)
6. Accessory dwelling units shall comply with all international building and fire codes, but in no case shall such building and/or structure have a setback less than three feet (3') from any interior or rear lot line. When on a corner lot, a detached accessory dwelling unit shall be no nearer to a side lot line adjoining a street than the applicable street-side setback required in the dimension...
Shed & Carport Rules
Caldwell tiers accessory building setbacks by size: structures under 200 square feet need only a 3-foot setback, while anything from 200 up to 600 square feet must sit at least 5 feet from interior side and rear lot lines, under City Code Section 10-12-03-1.
Caldwell Accessory Building and Shed Setbacks
Some RestrictionsCaldwell City Code § 10-12-03-1(2)(C)
(2) Standards for Accessory Structures/Buildings: ... ... C. Setbacks: ... The following requirements are applicable to all accessory structures associated with a principal residential use utilized for residential purposes regardless of the zoning district in which the structure is constructed/placed and to all accessory structures within the C-1, C-2, C-3, C-4, T-N, and H-C districts unless ...
Tiny Homes
Caldwell's zoning definitions treat a detached tiny home built to the International Residential Code as a form of detached single-family dwelling, meaning it must comply with the same district standards as any other detached house rather than being barred outright.
Caldwell, ID Tiny Home Zoning Classification
Light RestrictionsCaldwell City Code § 10-01-10
DWELLING - SINGLE FAMILY (DETACHED): A one-family dwelling that is not attached to any other principal dwelling but may include an attached or detached Accessory Dwelling Unit (ADU) as defined within this article. This definition also includes detached tiny homes complying with the International Residential Code, and detached cottage type housing.
Looking for Canyon County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Caldwell city rules.
Accessory Structures in Canyon County →