Adu estimate — Portland, OR

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 estimate provides a preliminary look at the potential investment required for your backyard project. This helps you determine if your budget aligns with your vision before you commit to full blueprints or engineering. You need an estimate early in the process to understand how factors like site grading and utility trenching affect the overall bottom line. This is a great starting point for any homeowner. Exact pricing confirmed free on the call.

Frequently asked in Portland

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

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