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155 houses tagged ADU on this board — Clark holds 98, Cowlitz 29. Vancouver and Longview are the city cuts.
How To Use This Guide
Active ADUs
155
Statewide on this RMLS board, counted 2026-08-31.
Clark County
98
Most of the Washington book. Vancouver is the city shortcut.
Cowlitz County
29
The next pocket. Longview is the city cut.
ADU is a keyword on a house, not a property type. Clark holds most of the Washington book. Cowlitz is the next pocket. The remaining listings are a thin remainder — use the statewide search rather than inventing empty county hubs.
98 of 155 Washington ADU listings sit in Clark County. Vancouver is the city shortcut. The keyword means an accessory dwelling is tagged on the house — confirm it is permitted and still there before you write.
Cowlitz has 29 ADU listings. Longview is the city cut. The remaining Washington ADU inventory is a thin remainder — use the statewide search rather than inventing a county hub that is empty.
NLP matches ADU or accessory dwelling. In-law and granny-flat remarks do not. Guest-quarters codes (GSTQTR, SEPLVQT, 2ND-RES) exist on the MLS but are not this search. These CTAs stay on keywords=ADU.
Statewide first, then Clark and Cowlitz — the counties that actually hold ADU inventory.
Every active Washington listing tagged ADU. 155 counted 2026-08-31.
Search Washington ADUs98 listings — most of the Washington book.
Clark ADUs29 listings. Longview is the city cut.
Cowlitz ADUsClark County city shortcut — tighter than the county search.
Vancouver ADUsCowlitz County city cut.
Longview ADUsGet Alerts
Open the search first, then save it to your Client Platform when you want alerts for new Washington ADUs.
Open a county for city context, then come back to the ADU shortcuts above.
Vancouver, Camas, Battle Ground, Washougal, Ridgefield, and the Washington side of the Portland metro.
View Clark County
Longview, Kelso, Castle Rock, Kalama, and the Lower Columbia River corridor.
View Cowlitz CountyExplore More
Comparing a Vancouver accessory dwelling to a Longview house with an ADU? One broker, Washington ADU inventory on this board.
