Affordable accessory dwelling unit — Portland, OR

Looking for affordable accessory dwelling unit in Portland, OR? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve Portland and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

Affordability in backyard homes often comes down to choosing efficient designs and standardized floor plans. By selecting a model that fits your existing utility footprint and requires minimal site excavation, you can keep your budget manageable. Exact pricing confirmed free on the call.

Frequently asked in Portland

What are the disadvantages of ADUs in Portland?

How much does an ADU cost in Oregon?

What are the rules for ADUs in California?

California has statewide ADU laws designed to streamline approvals, but local ordinances in cities like Los Angeles or San Francisco can add specific requirements. These often relate to setbacks, lot coverage, and parking. Pros can clarify how these apply to your situation.

Is an ADU allowed in Maryland?

Yes, ADUs are allowed in Maryland, with specific regulations varying by county and municipality, including areas near Baltimore. Many jurisdictions have updated their zoning codes to encourage ADUs, but it's essential to check your local planning department for exact rules. A consultation will clarify this for your specific property.

What are the rules for ADUs in California?

California's ADU laws aim to make building easier, often requiring cities to allow ADUs by right under certain conditions. Key rules involve minimum lot sizes, owner occupancy requirements, and limitations on fees. These pros can guide you through the specific requirements for your California project.

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

All cities in Oregon →

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

Service area details

630,498residents

4,723per sq mile

8ZIP codes served

Serving all of Portland — population 630,498; about 4,723 residents per square mile across 133.5 sq mi. ZIP codes covered include 97201, 97202, 97203, 97204, 97205, 97206, 97207, 97208.

Neighborhoods served in Portland: Hawthorne, Laurelhurst, Sellwood-Moreland, Alberta Arts District, Kenton — and every surrounding area.