Backyard accessory dwelling unit — 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
This is a detached living space built on your property, separate from your main home. People typically choose this option when they need a private office, a guest suite, or a separate place for family members to stay while maintaining distance from the primary house. These units use existing yard space to add square footage to your property without an addition to the main structure. Exact pricing confirmed free on the call.
Frequently asked in Spokane Valley
Can I find an accessory dwelling unit contractor in San Diego?
What is an ADU unit and how can I get one in Spokane Valley?
What is the cost of an accessory dwelling unit in Spokane Valley?
What is the ADU permit process in Spokane Valley?
Are there affordable accessory dwelling unit options in Spokane Valley?
What is the accessory dwelling unit permit cost in Spokane Valley?
What are accessory dwelling units (ADUs) and how do they work?
Accessory dwelling units (ADUs) are secondary housing units on a single-family lot, offering independent living. They can be detached cottages, attached suites, or garage conversions. ADUs provide extra space for family, guests, or rental income, enhancing property value.
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: Mirabeau Park, Opportunity, Indian Trail, Shadle, Five Mile — and every surrounding area.
Areas we serve
Browse by state, then city.