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
The best ADU for your property is one that increases your home value while meeting your specific lifestyle needs. Whether you need a private office, a rental income source, or a space for family, the right unit features durable materials and an efficient layout. We focus on high-quality construction that stands the test of time, ensuring your investment is built to last. We help you design the perfect fit. Exact pricing confirmed free on the call.
Frequently asked in Portland
What are the disadvantages of ADUs?
Potential drawbacks include the initial construction expense, possible increases in utility bills, and the utilization of existing yard space. You might also consider the impact on privacy for current residents. The pros can discuss these trade-offs specific to your Portland home.
How much does an ADU cost in Oregon?
ADU costs in Oregon vary widely depending on factors like size, architectural design, material choices, and site preparation. The complexity of utility hookups and the specific location within Portland also play a role. A personalized quote from a local pro is the best way to get an accurate figure.
What are the rules for ADUs in California?
California has state laws that encourage ADU development, often streamlining the approval process and limiting local restrictions. While these rules are specific to California, they reflect a national trend toward making ADUs more accessible and easier to build.
Is ADU allowed in Maryland?
Yes, Accessory Dwelling Units are permitted in many areas of Maryland, with local zoning codes defining specific requirements for size, setbacks, and owner occupancy. Cities like Baltimore have their own regulations. The pros can clarify what's permitted locally for your Portland project.
California has offered grant programs designed to help offset ADU construction costs, particularly for soft costs and pre-development expenses. While these specific programs are state-dependent, they demonstrate the potential for financial assistance in some regions for ADU projects.
What are the rules for ADU in California?
California's ADU laws, largely influenced by state legislation, aim to simplify the process of building ADUs on single-family lots. They often preempt local restrictions and streamline permitting. While Portland has its own distinct regulations, these state-level efforts show a national shift toward supporting ADUs.
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: Pearl District, Downtown, Hawthorne, Alberta Arts District, Sellwood-Moreland, Nob Hill — and every surrounding area.
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