Detached accessory dwelling unit — 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.
About this service
A detached ADU is a standalone building separate from your main home, like a backyard cottage. These provide the most privacy for you or your tenants since there are no shared walls. You need this if you have a large enough yard to accommodate a separate structure.
Frequently asked in Nampa
What's the first step to building an ADU in Nampa?
How do I find ADU services in Nampa?
What is the typical cost for accessory dwelling unit construction in Nampa?
Are there ADU builders near me in Nampa?
What are the benefits of adding an ADU in Nampa?
Can I get a prefabricated ADU in Nampa?
What information do I need for an ADU estimate 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, Lake Lowell Area, South Nampa, West Nampa, Skyline — and every surrounding area.
Areas we serve
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