Detached accessory dwelling unit — Beaverton, OR
Last updated: September 24, 2026
What affects the price
Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.
About this service
A detached ADU is a standalone building separate from your main home, like a backyard cottage. These provide the most privacy for you or your tenants since there are no shared walls. You need this if you have a large enough yard to accommodate a separate structure.
Frequently asked in Beaverton
What is an accessory dwelling unit in Beaverton?
Where can I find accessory dwelling unit builders in Beaverton?
What are accessory dwelling unit companies in Beaverton?
What are homes with mother-in-law suites like in Beaverton?
Are there affordable ADU options in Beaverton?
What services do you offer for accessory dwelling units in Beaverton?
Are prefabricated accessory dwelling units available in Beaverton?
Also serving nearby: Hillsboro · Portland · Vancouver · Gresham · Salem
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Beaverton — population 96,945; about 4,935 residents per square mile across 19.6 sq mi. ZIP codes covered include 97003, 97005, 97006, 97007, 97008, 97075, 97076, 97077.
Neighborhoods served in Beaverton: Raleigh Hills, South Beaverton, West Beaverton, Central Beaverton, Kinnaman — and every surrounding area.
Areas we serve
Browse by state, then city.