Accessory Structures in Nampa, ID (2026)
2 verified accessory structures rules for Nampa, Idaho, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Nampa allows one detached accessory dwelling per single-family lot, capped at 500 square feet with only one bedroom, no separate address, and no separate utility connections.
Nampa's Detached ADU Cap: 500 Sq Ft, One Bedroom
Some RestrictionsNampa City Code § 10-1-2
A detached accessory residential dwelling unit as a separate structure, is only allowed on the same lot/parcel as a single-family detached dwelling, provided they contain only one bedroom, no separate address, no separate utilities for their use. They may be combined with or be part of another detached structure such as a detached garage. The square footage of the accessory residential use with...
Shed & Carport Rules
In Nampa's RS residential zone, sheds over 200 square feet need a building permit and full setbacks; smaller sheds skip the permit but still follow siting rules.
Nampa Shed and Accessory Building Rules
Some RestrictionsNampa City Code § 10-8-4
Detached accessory structures over 200 square feet (201+) in footprint area shall comply with required front, side, and rear setbacks listed in subsection 10-8-5.A and require a building permit. C. Detached accessory structures 200 square feet or under and 12 feet or lower in height shall be built to no less than three feet from any primary structure wall (unless a building permit is obtained f...
Looking for Canyon County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Nampa city rules.
Accessory Structures in Canyon County →