Adu services — Portland, OR | AccessoryDwellingUnit Solutions

Looking for adu services in Portland, OR? Call AccessoryDwellingUnit Solutions 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 involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

ADU services manage the technical and creative side of building a secondary unit on your lot. Whether you are converting a garage or building a new structure from the ground up, you need these services to bridge the gap between architectural plans and physical construction. They help manage site preparation, utility connections, and structural integrity, ensuring your project is ready for occupancy without you having to coordinate multiple subcontractors independently.

Frequently asked in Portland

What are the disadvantages of ADUs in Portland?

In Portland, potential disadvantages might include navigating specific neighborhood design guidelines and ensuring adequate parking solutions. You'll also want to consider how an ADU might impact your property's landscaping. A professional can help you address these potential issues proactively.

How much does an ADU cost in Oregon?

What are the rules for ADUs in Portland?

Is an ADU allowed in Maryland?

While this service is geared towards Portland, ADU legality and rules vary greatly by location. Maryland has its own distinct regulations for accessory dwelling units. For information specific to Maryland, you would need to consult with local authorities or ADU professionals in that state.

What are the rules for ADU in California?

California has enacted state laws to encourage ADU development, often simplifying the approval process. However, local rules still apply. To understand California's ADU regulations, it's crucial to work with professionals knowledgeable about their specific state and local frameworks.

California has implemented financial assistance programs, potentially including grants or loans, to support ADU construction. These initiatives aim to make ADUs more accessible to homeowners. Information on current California ADU grants can typically be found through state or local housing resources.

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: Pearl District, Downtown, Hawthorne, Alberta Arts District, Sellwood-Moreland, North Portland — and every surrounding area.