Washington

Washington ADUAllowed checks.

Washington ADU rules are local plus state law. Verify city code and parcel constraints.

Quick answer

Washington ADU rules are local plus state law. Verify city code and parcel constraints.

Official ADU and zoning sources 30 connected markets

State source posture

Washington Department of Commerce ADU guidance

Washington ADU rules are local plus state law. Verify city code and parcel constraints.

Open state source

Seattle

Seattle ADU/DADU rules are official and permit-driven; verify lot, floor area, trees, and utility constraints.

HighOfficial source path

Spokane

Spokane, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Tacoma

Tacoma, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Vancouver

Vancouver, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Bellevue

Bellevue, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Kent

Kent, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Everett

Everett, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Renton

Renton, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Federal Way

Federal Way, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Yakima

Yakima, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Kirkland

Kirkland, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Bellingham

Bellingham, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Kennewick

Kennewick, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Auburn

Auburn, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Pasco

Pasco, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Redmond

Redmond, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Marysville

Marysville, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Shoreline

Shoreline, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Sammamish

Sammamish, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Richland

Richland, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Lakewood

Lakewood, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Lacey

Lacey, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Olympia

Olympia, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Bothell

Bothell, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Burien

Burien, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Bremerton

Bremerton, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Edmonds

Edmonds, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Puyallup

Puyallup, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Lynnwood

Lynnwood, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Lake Stevens

Lake Stevens, WA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.

HighOfficial source path

Cite this page

Use this page as a public web reference, not an official agency record. The linked official source remains the final authority.

ADUAllowed. "Washington ADUAllowed | Official Source Routes". https://www.aduallowed.com/states/wa/. Reviewed Jul 2026. Source and citation notes