Accessory dwelling unit permit — 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
An accessory dwelling unit permit is the required authorization from your local planning department to build on your lot. This paperwork confirms your plans follow zoning rules and structural safety standards. You need this service if you are in the planning stages of your backyard project.
Frequently asked in Gresham
What should I look for in accessory dwelling unit builders in Gresham?
What are the benefits of a detached accessory dwelling unit in Gresham?
A detached accessory dwelling unit in Gresham offers significant advantages. It provides independent living space, ideal for multi-generational families or rental income. Detached units offer more privacy for both residents. They can be placed strategically on your lot to maximize yard space. The pros can explain how a detached ADU fits your specific Gresham property.
What does ADU construction involve in Gresham?
How do I choose between accessory dwelling unit companies in Gresham?
What makes a good ADU company in Gresham?
Are prefab ADUs a good option in Gresham?
Prefab ADUs can be a very good option in Gresham. They are built off-site in a factory, which often leads to faster construction times and more predictable costs. This method can also ensure consistent quality. The pros can explain how prefab units can be customized for your Gresham property. They’ll detail the installation process.
What are some features of homes with mother-in-law suites 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: Downtown Gresham, Hollydale, North Gresham, Pleasant Home, West Gresham — and every surrounding area.
Areas we serve
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