Adu cost — Spokane Valley, WA
Last updated: September 24, 2026
What affects the price
Building an ADU involves variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.
About this service
The cost of your ADU is determined by your choice of foundation, roofing materials, interior finishes, and the current utility connection status of your property. Simple conversions are often more budget-friendly than custom ground-up builds. We provide a breakdown of how different selections impact your bottom line. Exact pricing confirmed free on the call.
Frequently asked in Spokane Valley
What kind of ADU housing is available?
Are there affordable accessory dwelling units in Spokane Valley?
What is involved in ADU construction?
How do I get an ADU permit in Spokane Valley?
What are the best accessory dwelling unit companies?
What does accessory dwelling unit mean?
An accessory dwelling unit (ADU) is a secondary, independent living space on a lot with a primary home. It has its own entrance, kitchen, and bathroom. ADUs offer flexibility for family, guests, or rental income. They are a practical way to add living space.
Can I get an ADU for rent in Spokane Valley?
While we don't handle rentals directly, many homeowners build ADUs in Spokane Valley to rent them out. This is a popular way to generate additional income. If you're looking to rent, you'd typically find listings on real estate platforms. Building your own ADU creates these opportunities.
Also serving nearby: Spokane · Yakima · Bellevue · Renton · Kirkland
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Spokane Valley — population 108,235; about 2,869 residents per square mile across 37.7 sq mi.
Neighborhoods served in Spokane Valley: Argonne, Dishman Hills, Opportunity, Greenacres, Fairwood — and every surrounding area.
Areas we serve
Browse by state, then city.