Adu Services in Portland, OR | AccessoryDwellingUnit Experts

Looking for adu services in Portland, OR? Call AccessoryDwellingUnit Experts 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 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

ADU services are the professional steps required to transform your backyard or garage into a functional living space. This process involves design consultations, structural engineering, and utility connections. You should look into these services if you are ready to increase your property value or need extra living space for relatives. We focus on making sure your project meets all safety codes and neighborhood regulations while fitting the specific design style of your main home.

Frequently asked in Portland

How do I get an ADU estimate in Portland?

What are the steps for getting an ADU permit in Portland?

Getting an ADU permit in Portland involves submitting a complete set of plans to the city's Bureau of Development Services. These plans must comply with current zoning and building codes. We assist in preparing and submitting the necessary documentation. This simplifies the approval process. Contact us to begin navigating the permit requirements.

What is the cost of an accessory dwelling unit in Portland?

What does accessory dwelling unit mean in Portland?

In Portland, an accessory dwelling unit (ADU) is a secondary housing unit on a single-family residential lot. It can be detached or attached to the main house and must meet specific city zoning and building standards. We can explain the specifics for Portland. Call us for more information.

Where can I find local ADU services in Portland?

Can I build a home with an in-law suite in Portland?

Yes, building a home with an in-law suite in Portland is achievable through ADU regulations. These suites provide independent living spaces for family members. We can guide you through the process of designing and constructing a suitable in-law suite. Contact us to explore your options.

What are the best accessory dwelling unit companies in Portland?

Accessory Dwelling Unit Experts partners with skilled and reliable local companies for ADU projects in Portland. We vet the professionals to ensure quality workmanship and adherence to local standards. Our aim is to make the process straightforward for homeowners. Call us to find a trusted ADU company.

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, Sellwood-Moreland, Pearl District, Alberta Arts District, Laurelhurst — and every surrounding area.