Detached 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
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 Gresham
What are the advantages of adding a mother-in-law suite in Gresham?
Adding a mother-in-law suite, or ADU, in Gresham offers several advantages. It can provide rental income, increasing your property's value. It also offers flexible living arrangements for aging parents or adult children. A well-built ADU integrates seamlessly with your existing Gresham property. It enhances your home's utility and appeal.
How much does it cost to build an accessory dwelling unit in Gresham?
Where can I find accessory dwelling unit services in Gresham?
What are the steps for ADU construction in Gresham?
Are prefabricated accessory dwelling units a good option for Gresham?
Prefabricated accessory dwelling units can be a good option for Gresham homeowners. They often offer faster construction times and potentially more predictable costs. A licensed, insured pro can assess if a prefab unit suits your site and Gresham's building codes. They ensure proper installation and integration with your existing home.
What is involved in accessory dwelling unit rental in Gresham?
Can I get an affordable accessory dwelling unit in Gresham?
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: Meadow Creek, North Gresham, West Gresham, Oakhills, Downtown Gresham — and every surrounding area.
Areas we serve
Browse by state, then city.