Adu Company in Portland, OR | AccessoryDwellingUnit Experts

Looking for adu company 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

An ADU company manages the entire project lifecycle, from initial design and permit acquisition to the final walk-through. You need a full-service company if you want to avoid the stress of coordinating different contractors or handling complex municipal filings yourself. We act as your single point of contact, ensuring your vision is executed correctly while keeping you informed at every stage of construction. Exact pricing confirmed free on the call.

Frequently asked in Portland

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

What is involved in ADU construction?

Are modular accessory dwelling units a good fit for Portland?

Modular accessory dwelling units can be a good fit for Portland, often offering quicker construction timelines and consistent quality. These units are manufactured off-site and then assembled on your property. The pros can assess if a modular ADU meets your design preferences and site requirements. They'll guide you through the process.

What is required for an accessory dwelling unit permit?

How can I find affordable accessory dwelling units?

What does 'accessory dwelling unit' mean in Portland?

In Portland, an 'accessory dwelling unit' (ADU) refers to a secondary housing unit on a single-family lot. It's separate from the main house and provides independent living facilities. This can be a detached structure or an addition to the existing home. ADUs offer flexibility for various housing needs.

Where can I find accessory dwelling unit builders near me?

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