Cost of Accessory Dwelling Unit in Portland, OR

Looking for cost of accessory dwelling unit in Portland, OR? Call AccessoryDwellingUnit Direct 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 variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.

About this service

Building an ADU involves several variables that shift your final total, such as the size of the unit, whether you choose a detached structure or a garage conversion, and the complexity of your site’s plumbing and electrical needs. We help you navigate these choices to keep your project on track. Exact pricing confirmed free on the call.

Frequently asked in Portland

What are the disadvantages of ADUs?

How much does an ADU cost in Oregon?

What are the rules for ADUs in Oregon?

Is ADU allowed in Maryland?

What are the rules for ADU in California?

California has implemented some of the most homeowner-friendly ADU regulations nationwide, often simplifying the permitting process. If your interest is in California, we cannot assist. However, for those in Portland, our service ensures you connect with local experts who know Oregon and Portland ADU rules.

California has introduced grants and financial incentives to help homeowners build ADUs, which can significantly reduce project costs there. These specific programs are not applicable in Oregon. For Portland homeowners, the focus is on providing accurate, no-obligation quotes from experienced local professionals to help you budget.

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, Hawthorne, Sellwood-Moreland, Alberta Arts District, Mississippi Avenue, Laurelhurst — and every surrounding area.