Accessory Structures in Caldwell, ID (2026)
5 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 an accessory dwelling unit by right on single-family lots. ADUs must be at least 200 square feet, are limited to one bedroom, and may not use a recreational vehicle or mobile home. The ADU cannot be subdivided off the parcel and must meet accessory-structure setbacks.
Caldwell Accessory Dwelling Unit (ADU) Rules
Some RestrictionsShed Rules
Caldwell sheds and detached accessory buildings under 200 square feet need no setback; those 200 to under 600 square feet must sit at least 5 feet from interior side and rear lot lines. In residential zones an accessory structure may not be larger than the principal home without a special use permit, and height is capped by district.
Caldwell Shed and Accessory Building Rules
Few RestrictionsGarage Conversions
Caldwell has no separate 'garage conversion' ordinance. Converting a garage into living space is reviewed as a building-permit and zoning matter, and if it creates a second independent dwelling it must meet the city's accessory dwelling unit standards in 10-12-03-1, including the one-bedroom limit and accessory-structure setbacks.
Caldwell Garage Conversion Rules
Some RestrictionsCarport Rules
Caldwell regulates carports as accessory structures under City Code 10-02-04. A detached carport follows the same size-based setbacks as other accessory buildings - no setback under 200 square feet, 5 feet for 200 to under 600 square feet - and the same district height caps of 22 or 33 feet.
Caldwell Carport Rules
Few RestrictionsTiny Homes
A tiny home on a permanent foundation is treated as a regular dwelling or ADU in Caldwell and must meet building and zoning code. A tiny home on wheels or a recreational vehicle is prohibited for use as an ADU under City Code 10-12-03-1, and Idaho generally bars living in an RV on a standard residential lot.
Caldwell Tiny Home Rules
Heavy RestrictionsLooking for Canyon County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Caldwell city rules.
Accessory Structures in Canyon County →