Summary of Nampa City Code §10-7 (Accessory Dwelling Units) as it applies in Nampa. Reference: https://library.municode.com/id/nampa/codes/code_of_ordinances.
Code evolves continuously. Verify at the official source (https://library.municode.com/id/nampa/codes/code_of_ordinances) before any development decision.
Applicable code
Code references active as of publication. Verify current standards at the official source before any development decision.
Accessory dwelling units are permitted as accessory uses in RS Single-Family Residential District and other residential districts where single-family dwellings are allowed, subject to specific standards for size, setbacks, and parking.
Investor implication: ADUs are permitted in single-family zones, creating rental income opportunities on existing lots without rezoning.
Contact Nampa Planning & Zoning to verify current ADU size limits. Nampa City Code Title 10 Chapter 8 establishes size standards for accessory dwelling units in residential districts.
Investor implication: Size limits affect development feasibility; verify maximum square footage or percentage of primary dwelling before design.
Contact Nampa Planning & Zoning to verify whether detached ADUs, attached ADUs, or both are permitted. Nampa City Code Title 10 Chapter 8 governs ADU types in residential districts.
Investor implication: ADU type allowance (detached vs. attached) affects site planning and construction costs.
Accessory dwelling units must comply with setback requirements established for accessory structures in the applicable zoning district, with specific provisions at §10-8-23 for RS district setbacks.
Investor implication: Standard accessory structure setbacks apply; verify district-specific requirements before site planning.
Contact Nampa Planning & Zoning to verify specific setback distances (front, side, rear) for ADUs in RS district. Nampa City Code §10-8-23 establishes setback standards for accessory structures.
Investor implication: Specific setback distances determine buildable area and ADU placement on lot.
Contact Nampa Planning & Zoning to verify parking requirements for ADUs. Nampa City Code Title 10 establishes parking standards for accessory dwelling units.
Investor implication: Parking requirements affect site layout and may require additional off-street spaces.
Idaho SB 1354 prohibits cities from requiring owner-occupancy as a condition of ADU approval, effective July 1, 2026.
Investor implication: Out-of-state investors and non-occupant owners can develop ADUs without owner-occupancy restrictions after July 1, 2026.
Contact Nampa Planning & Zoning to verify whether Nampa currently has an owner-occupancy requirement and whether it will be removed by July 1, 2026 to comply with Idaho SB 1354.
Investor implication: Current local owner-occupancy requirement status affects immediate ADU development feasibility; SB 1354 compliance timeline affects post-July 2026 projects.
Idaho SB 1354 requires cities over 10,000 population to allow at least one ADU per single-family lot, prohibits blanket square-footage bans, and prevents HOAs from adding new ADU restrictions without written consent of all members.
Investor implication: State law guarantees minimum ADU rights; local ordinances cannot prohibit ADUs entirely or impose unreasonable size restrictions.
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