Cost to build accessory dwelling unit — Gresham, 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
Building an ADU involves costs for permits, site prep, foundation, framing, plumbing, and electrical work. Prices fluctuate based on whether you choose a custom design or a pre-planned layout, as well as the complexity of connecting to existing city utilities. Exact pricing confirmed free on the call.
Frequently asked in Gresham
What's the most asked question about ADU services in Gresham?
What are the first steps for ADU construction in Gresham?
How do I get an ADU permit in Gresham?
What's involved in a modular accessory dwelling unit?
Where can I find accessory dwelling unit builders near me in Gresham?
What should I expect for an ADU quote?
How is ADU financing typically handled?
ADU financing can be handled through various means, including home equity loans, personal loans, or construction loans. Some homeowners use savings or take out a mortgage refinance. It's important to discuss your financing options with your bank or a mortgage broker early in the process. Understanding your budget will help guide the design and scope of your ADU project in Gresham. We can provide the cost estimate needed for your financial planning.
Also serving nearby: Portland · Vancouver · Beaverton · Hillsboro · Salem
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Gresham — population 110,685; about 4,706 residents per square mile across 23.5 sq mi. ZIP codes covered include 97030, 97080.
Neighborhoods served in Gresham: Crestview, North Gresham, South Gresham, Willow Creek, Pleasant Valley — and every surrounding area.
Areas we serve
Browse by state, then city.