Accessory dwelling unit permit cost — Nampa, ID
Last updated: September 24, 2026
What affects the price
Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.
Frequently asked in Nampa
What are the rules for a backyard accessory dwelling unit in Nampa?
Can I get a prefab ADU for my Nampa property?
Who are the accessory dwelling unit builders near me in Nampa?
What are the requirements for accessory dwelling unit homes in Nampa?
What is the best ADU option for my Nampa property?
How much does an accessory dwelling unit contractor cost in Nampa?
What is involved in ADU building in Nampa?
Also serving nearby: Meridian · Boise City · Bend · Spokane Valley · Spokane
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Nampa — population 114,268; about 3,286 residents per square mile across 34.8 sq mi. ZIP codes covered include 83651, 83652, 83653, 83686, 83687.
Neighborhoods served in Nampa: Downtown Nampa, South Nampa, West Nampa, Garrity Neighborhood, Lake Lowell Area — and every surrounding area.
Areas we serve
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