Accessory dwelling unit construction cost — Vancouver, WA

Last updated: September 24, 2026

What affects the price

Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

The cost of building an ADU depends on your choice of materials, the square footage, and whether you are doing a garage conversion or a new detached build. Site access and utility upgrades also play a big role in the final bill. Exact pricing confirmed free on the call.

Frequently asked in Vancouver

Also serving nearby: Portland · Gresham · Beaverton · Hillsboro · Salem

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

Service area details

Serving all of Vancouver — population 196,442; about 4,029 residents per square mile across 48.7 sq mi. ZIP codes covered include 98660, 98661, 98662, 98663, 98664, 98665, 98666, 98668.

Neighborhoods served in Vancouver: Downtown Vancouver, Fisher's Landing, Hazel Dell, Salmon Creek, The Heights, Carter Park — and every surrounding area.