Portland ADU Permit Fees & Cost Calculator
Portland has official ADU fee guidance showing sample permit and related city charges, plus separate impact-fee treatment for some ADUs. Exact total fees depend on project type, valuation, site conditions, and whether system development charges are waived or triggered.
Free ADU fee calculator
Estimate local ADU fees
Step 1 of 5: Location
The calculator uses staged city data from the ADUFee database with visible confidence levels and dated source tracking.
Fee overview
Many Portland ADU charges are project-specific and depend on valuation, site conditions, utility upgrades, and whether SDC waivers apply.
The source fee table is dated effective July 1, 2023; current fees may have changed.
Third-party fee estimates were not used as primary inputs because they are not official sources and may be outdated or incomplete.
The user wants official fee-related data for Portland, Oregon, focused on ADUs rather than general construction costs.
The sample fee table for a new detached ADU is the closest official city source available, but it is not a universal fee schedule for every ADU type.
Converted-space ADUs may have different fees than new detached ADUs.
FAQs
Are Portland ADU fee estimates official?
No. ADUFee.com provides planning estimates only. Final fees are set by the city, utility providers, school district, and other agencies.
What sources are used for Portland?
The database stores city, state, utility, school, county, and other source links where available. Each estimate should still be verified locally.
Can ADU fees vary within Oregon?
Yes. Permit, utility, school, inspection, and impact fees can vary by jurisdiction, parcel, project size, utility provider, and local interpretation.