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.

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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.

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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.

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How long does it take to build an ADU in Portland?

ADU timelines vary based on design complexity, permitting, and site conditions. In Portland, the process typically includes several months for design and permitting, followed by construction. FXD Construction provides realistic timelines and manages scheduling to keep the project moving efficiently through each phase.

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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.

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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.

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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