Modular Accessory Dwelling Unit in Portland, OR | AccessoryDwellingUnit Experts

Looking for modular accessory dwelling unit 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

These units are built in a factory setting and then transported to your property for final assembly. This option is often chosen to reduce construction time and minimize disruption to your neighborhood. The final price is influenced by transport logistics, site preparation, and the level of customization. Exact pricing confirmed free on the call.

Frequently asked in Portland

What is involved in ADU construction?

Can I get an emergency ADU installed quickly?

While 'emergency' ADUs aren't a standard service, we focus on efficiency. The timeline depends on permitting approvals and site readiness. Prefabricated ADUs can sometimes speed up the construction phase. We can assess your needs to provide realistic timelines for your project.

How do I get an ADU quote?

To get an ADU quote, call us. We'll schedule a site visit to your Portland property. During this visit, we assess the location and your specific requirements. Based on this, we provide a detailed, no-obligation quote for the project.

What is the cost of an accessory dwelling unit?

The cost of an accessory dwelling unit in Portland depends on its size, design complexity, and chosen materials. Site preparation, utility hookups, and permitting fees also factor in. We provide a detailed quote after a thorough property assessment to ensure accuracy.

What kind of ADU companies are there?

ADU companies are specialized firms that handle the design, permitting, and construction of accessory dwelling units. They employ licensed architects, designers, and builders. Their expertise ensures your ADU meets all local codes and your specific needs.

What does 'adu near me' mean for Portland residents?

For Portland residents, 'adu near me' means working with local professionals. These pros understand Portland's specific zoning laws and building codes. Their proximity ensures efficient site visits and reliable service. We provide that local expertise for your ADU project.

What is the permit cost for an ADU in Portland?

The permit cost for an ADU in Portland is determined by the project's valuation and the city's fee structure. These fees cover the review and inspection process. We can provide an estimate for these costs as part of your overall project quote.

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