Accessory dwelling unit services

Looking for accessory dwelling unit services in Spokane, WA? Call AccessoryDwellingUnit Services for a contact a provider — no obligation. Licensed adu builders serve Spokane and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.

About this service

These services cover the end-to-end process of adding a secondary home to your property. This includes initial zoning checks, architectural design, permit filing, and final construction. You need these services when you want to create a separate living space for family, guests, or as a rental unit, but don’t want to manage the complex legal and structural requirements on your own.

Frequently asked in Spokane

What are the disadvantages of ADUs in Spokane?

Some disadvantages of ADUs in Spokane can include initial construction costs and potential impacts on your existing yard space. You might also need to consider how an ADU affects your property's privacy and utilities. It's important to weigh these against the benefits of increased rental income or housing for family. Getting advice from local pros is key.

How much does an ADU cost in Washington?

What are the rules for ADUs in Washington?

Washington state has specific regulations for ADUs, and Spokane has its own local ordinances. These often cover things like maximum size, setbacks from property lines, and parking requirements. Understanding these rules is crucial before you start. A licensed pro can guide you through Spokane's specific zoning.

Is an ADU allowed in Spokane?

Yes, ADUs are generally allowed in Spokane, but there are specific zoning requirements and permit processes you'll need to follow. The city has been working to encourage ADU development to address housing needs. It's always best to confirm with the city planning department and consult with local ADU specialists.

What are the rules for ADUs in Spokane?

Are there grants for ADUs in Spokane?

Also serving nearby: Spokane Valley · Yakima · Bellevue · Renton · Kirkland

All cities in Washington →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

229,447residents

3,336per sq mile

8ZIP codes served

Serving all of Spokane — population 229,447; about 3,336 residents per square mile across 68.8 sq mi. ZIP codes covered include 99201, 99202, 99203, 99204, 99205, 99206, 99207, 99208.

Neighborhoods served in Spokane: South Hill, North Spokane, Browne's Addition, West Central, East Spokane — and every surrounding area.