Oregon ADU Cost in 2026
Building an ADU in Oregon typically costs between $160,000 and $380,000 in 2026, depending on size, location within the state, and finish level.
Typical range
$160k–$380k
Per sqft
$230–$460
Where the money goes
Line-item averages for a typical ADU build. Actual percentages vary by site conditions and finish level.
Foundation
$25k–$45kFraming & shell
$60k–$120kMechanical / electrical / plumbing
$35k–$70kFinishes
$30k–$90kPermits & impact fees
$10k–$30kDesign & engineering
$15k–$35kOregon ADU costs are influenced by several state-specific factors: local labor rates, permit fees, soft costs from design and engineering, and impact fees from utilities and schools.
Within Oregon, costs vary significantly by metro area. Major urban markets typically run 20-40% higher than rural or suburban projects.
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