Chelan County, WA ADU (accessory dwelling unit) Rules (2026): City or County?

A Chelan County mailing address doesn’t tell you who issues the permit. City of Wenatchee, City of Chelan, and unincorporated Chelan County are different counters. East Wenatchee, across the Columbia, is Douglas County, Washington — not this county and not the City of Wenatchee.

Washington’s urban ADU floor is covered in the Washington ADU laws guide, but you still need the local packet. Rural and resource land can follow a different path than a lot inside an urban growth area. Ask the reviewer who covers the parcel, and give them the parcel number rather than the mailing city.

What to confirm before you pick a model

• Which office reviews the lot: Wenatchee, Chelan, Leavenworth, another city, or the county.
• Whether a second dwelling is allowed in that zone, and any size, height, or owner-occupancy rule still on the books.
• Water and sewer or septic capacity for another dwelling, including bedroom count.
• Setbacks, shoreline, floodplain, and wildfire or critical-area notes that move the pad.
• Truck or crane access. Cascade passes, chain restrictions, and winter closures all affect a delivery from Battle Ground.

Local notes by city:

• Wenatchee
• Chelan

For pass delivery, snow, wildfire, and how Chelan County compares with other mountain counties, see mountain cabins and ADUs in the Cascades.

What Wolf does

We read the address, name the likely reviewer, and flag access, utilities, and placement before anyone orders a plan. The home is built in our Battle Ground factory. Turn-key service (evaluation, permitting support, site work, delivery, and setup) covers Washington and Oregon. Chelan County is on that list when the lot and the route work.

Request a free property evaluation.

General planning notes. Confirm the current code and fees with the office that covers your parcel before you commit to a design.