Last updated: September 24, 2026
What affects the price
Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.
About this service
Frequently asked in Portland
What are the disadvantages of ADUs?
How much does an ADU cost in Massachusetts?
The cost of an ADU in Massachusetts is influenced by many factors, including the size of the unit, the quality of materials used, and the specific site conditions in Boston. Permitting fees and necessary utility upgrades also contribute to the overall price. A detailed estimate from a local professional is the best way to get an accurate cost.
What are the rules for ADUs in California?
California has state legislation promoting ADUs, but local city ordinances still apply and can vary. These rules often address setbacks, lot coverage, and parking requirements. While we operate in Portland, understanding these broader trends is informative. We focus on Portland's rules.
Is an ADU allowed in Maryland?
ADUs are permitted in many parts of Maryland, but regulations differ by county and city. It's essential to check your local zoning laws for specific requirements regarding size, placement, and occupancy. Our expertise is focused on Portland, Oregon.
What are the rules for ADU in California?
California's ADU laws aim to streamline approvals and increase housing availability, often setting statewide minimums for size and permitting processes. However, local jurisdictions maintain their own specific requirements. We focus on Portland's specific rules.
This grant was part of California's effort to make ADUs more accessible, especially for lower-income households. It was designed to help cover construction expenses. While this is a California program, we can help you find local pros who are aware of any similar initiatives in Oregon.
Also serving nearby: Vancouver · Beaverton · Gresham · Hillsboro · Salem
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: Laurelhurst, Sellwood-Moreland, Pearl District, Hollywood District, Alberta Arts District, Hawthorne — and every surrounding area.
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