Accessory Structures in Idaho (2026)

Unincorporated Ada County allows one secondary (accessory) dwelling per lot of at least 6,000 square feet. It must be…

Boise allows up to two accessory dwelling units per single-family lot, capped at 900 square feet or 70% of the primary…

In unincorporated Bonner County, Idaho, an accessory dwelling unit is capped at 900 square feet and two bedrooms, needs…

Caldwell allows accessory dwelling units as an accessory use under Section 10-12-03-1, requiring compliance with the…

In the City of Coeur d'Alene, accessory dwelling units are permitted within all Residential and Commercial Zoning…

Unincorporated Kootenai County allows one accessory living unit per parcel with an accessory living unit permit from…

Meridian caps accessory dwelling units at 900 square feet or half the primary home, requires a city permit, and limits…

Nampa allows one detached accessory dwelling per single-family lot, capped at 500 square feet with only one bedroom, no…

In the City of Pocatello, City Code § 17.06.100 allows one accessory dwelling unit as an accessory use to a…

Unincorporated Canyon County, Idaho charges a $1,581 development impact fee per accessory dwelling unit built inside…

In the City of Coeur d'Alene, connecting an accessory dwelling unit to the public sewer triggers a sewer capitalization…

Ada County Code 8-4-23(B)(3) requires that either the principal home or the secondary dwelling stay continuously…

Inside the Harris Ranch Specific Plan area, Boise requires the principal home or its accessory dwelling to stay…

Canyon County Code § 07-14-25 requires the owner of the lot to live on site wherever a secondary residence, the…

In the City of Coeur d'Alene, owner occupancy is tied to short-term rental use of an ADU: either the principal dwelling…

In the City of Pocatello, City Code § 17.06.100.C.9 requires a deed restriction to be recorded on any lot with an…

Ada County Code 8-4-23(F) requires a recorded deed restriction on every secondary dwelling stating that once no owner…

In unincorporated Bannock County, an accessory cottage dwelling built under the county's ADU provision can never be…

In the City of Coeur d'Alene, an ADU used for less than 30-day stays falls under the short-term rental article in…

In unincorporated Ada County, a detached accessory structure (shed, garage, workshop) may not exceed 24 feet in height…

In unincorporated Bannock County, Bannock County Code Section 17.52.040(D) caps total lot coverage, including the house…

Detached carports in Boise can't sit in front of the house or encroach into front and street-side setbacks without a…

In unincorporated Bonner County, Idaho, a detached storage shed, playhouse, carport, shop or garage with up to 1,080…

In Bonneville County's unincorporated residential zones, a shed or other accessory building cannot cover more than 30%…

Caldwell tiers accessory building setbacks by size: structures under 200 square feet need only a 3-foot setback, while…

Unincorporated Canyon County, Idaho treats a shed as an 'accessory structure,' defined in Canyon County Code § 07-02-03…

In the City of Coeur d'Alene, a shed or other accessory structure in the rear twenty five feet of a lot sits at least…

In unincorporated Kootenai County, a one-story detached storage shed 200 sq ft or smaller needs no building permit, but…

Meridian exempts one-story detached tool and storage sheds, playhouses, and similar accessory structures from a…

In Nampa's RS residential zone, sheds over 200 square feet need a building permit and full setbacks; smaller sheds skip…

In the City of Pocatello, City Code § 17.06.200.A permits accessory structures like sheds and detached garages by right…

In the Agricultural Range Preservation zone of unincorporated Twin Falls County, a detached shed or other accessory…

Unincorporated Ada County lets you convert an existing garage, basement, or detached accessory structure into a…

Boise allows turning a garage into living space as an accessory dwelling unit, but only if replacement off-street…

Ada County's zoning code treats a tiny home as a manufactured home. A tiny home used as a second unit must meet the…

Boise allows a tiny home on wheels as an accessory unit to a single-family home, capped at 400 square feet and subject…

Unincorporated Bonner County, Idaho has no separate tiny home category. Its zoning definitions fold tiny houses into…

Bonneville County's floodplain code classifies tiny homes as manufactured homes and recreational vehicles. Any tiny…

Unincorporated Canyon County builds tiny homes under Appendix R of the 2018 International Residential Code, adopted at…

The City of Coeur d'Alene adopts the 2018 International Residential Code with local amendments and turns on Appendix Q…

Kootenai County has no dedicated tiny-home ordinance. A tiny home on wheels is a recreational vehicle or park model RV…

Caldwell's zoning definitions treat a detached tiny home built to the International Residential Code as a form of…