Cost to build accessory dwelling unit — Boise City, ID
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.
About this service
When calculating the budget for a secondary unit, consider the costs for architectural design, permits, materials, and labor. Custom designs and high-end interior finishes will push your budget higher, while standardized layouts can keep costs more predictable. Exact pricing confirmed free on the call.
Frequently asked in Boise City
What are the key considerations for ADU construction in Boise City?
What are accessory dwelling unit homes like in Boise City?
What influences the cost of an accessory dwelling unit in Boise City?
Are there specific accessory dwelling unit grants available for Boise City residents?
What are the benefits of having a local ADU service in Boise City?
What types of ADU services are typically offered in Boise City?
Can I build an accessory dwelling unit in Boise City for rent?
Also serving nearby: Meridian · Nampa · Bend · Spokane Valley · Spokane
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Boise City — population 235,421; about 2,784 residents per square mile across 84.6 sq mi.
Neighborhoods served in Boise City: North End, East Boise, West Boise, Downtown Boise, South Boise — and every surrounding area.
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