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Portland ADU Builder
Portland zoning rules, utility requirements, and permitting timelines make ADU projects difficult to plan without guidance. FXD Construction helps homeowners understand feasibility, realistic costs, and exp
Why Homeowners Build ADUs
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Rental income
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Housing for family members
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Aging-in-place planning
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Property value improvement
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Downsizing on the same lot
Types of ADUs We Build
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Backyard cottages
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Garage conversions
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Basement apartments
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Attached additions
ADU Construction Services
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Zoning and site feasibility review
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Layout planning and design coordination
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Permit preparation and City of Portland approvals
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Foundation, framing, and structural work
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Utility connections, plumbing, and electrical
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Interior finishes built for long-term durability
Frequently Asked ADU Questions
Do ADUs require permits in Portland, Oregon?
Yes. All ADUs in Portland require permits through the City of Portland. Permits typically cover zoning compliance, structural work, plumbing, electrical, and life-safety requirements. FXD Construction manages the full permitting process and coordinates directly with the City to ensure approvals are handled correctly and efficiently.
How does Portland zoning affect ADU construction?
Portland zoning regulations determine whether an ADU is allowed and set requirements for size, height, setbacks, and placement on the property. Zoning rules can vary based on lot size, existing structures, and neighborhood overlays. FXD Construction reviews zoning and site conditions early in the process to confirm feasibility before design or permitting begins.
What types of ADUs can be built in Portland?
Portland allows several ADU types depending on zoning and site conditions, including detached backyard ADUs, garage conversion ADUs, internal ADUs within the home, and above-garage ADUs. FXD Construction helps homeowners evaluate which ADU type is best suited for their property and goals.
How long does it take to build an ADU in Portland?
Most ADU projects in Portland take 9–14 months total from initial planning to completion.
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Feasibility, design & engineering: 2–4 months
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City permitting review: 2–6 months (varies by review cycle and revisions)
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Construction: 4–6 months depending on size and site access
Some projects move faster and others take longer, but this range reflects typical Portland permitting timelines. FXD Construction plans scheduling around city review phases to keep the project progressing and avoid unnecessary delays.
What is the average cost to build an ADU in Portland?
The cost to build an ADU in Portland varies based on size, type, finishes, site conditions, and utility connections. Most new detached ADUs in the Portland metro area fall between approximately $200,000 and $350,000, with some projects above or below that range depending on scope and materials. Conversions of existing spaces, such as garage or basement ADUs, typically cost less—often in the $90,000 to $180,000 range—while high-end or larger detached units can exceed the typical range. FXD Construction helps homeowners understand cost drivers early in the process so you can plan a project that fits your budget and goals.
Do you handle Portland building codes and inspections?
Yes. ADU construction in Portland must comply with specific building codes related to energy efficiency, life safety, structural design, and utilities. FXD Construction coordinates all required inspections and ensures the ADU is built to the current City of Portland building and zoning standards.
Is an ADU a good investment in Portland?
Many Portland homeowners build ADUs for rental income, multigenerational living, home offices, or aging-in-place solutions. While every situation is different, ADUs can add long-term value and flexibility when designed and built correctly. FXD Construction helps homeowners evaluate feasibility and long-term use during the planning phase
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Address
18391 Wood Thrush st, Lake Oswego, OR 97035
Contact
503 - 806 - 6644
CCB: 240841
Opening Hours
Mon - Fri
Saturday
Sunday
8:00 am – 5:00 pm
closed
closed
