ADU Impact Fees: Gresham vs Portland
How do adu impact fees rules compare between Gresham, OR and Portland, OR?
Gresham, OR
Multnomah County
No data available yet for Gresham.
Portland, OR
Multnomah County
Portland's System Development Charge (SDC) waiver for ADUs ended December 31, 2023. As of 2024, ADUs pay SDCs based on size but typically at reduced rates compared to full-size dwellings. Standard SDCs cover transportation, parks, water, sewer, and stormwater. Permit fees through BDS apply separately. Total SDCs for a new ADU range from approximately $11,000 to $19,000.
View full Portland rules →Key Facts Comparison
| Fact | Gresham | Portland |
|---|---|---|
| Waiver Status | - | Ended Dec 31, 2023 |
| SDC Range | - | ~$11,000-$19,000 per ADU |
| SDC Components | - | Transportation, Parks, Water, Sewer, Stormwater |
| Affordable ADU | - | May qualify for exemption |
| School CET | - | ~$1.50/sq ft |
Highlighted rows indicate differences between cities.
Gresham FAQ
No FAQs available.
Portland FAQ
Does Portland still waive ADU SDCs?
No. The ADU SDC waiver expired December 31, 2023. ADU projects permitted after that date pay full or reduced SDCs covering transportation, parks, water, sewer, and stormwater systems.
How much will an ADU cost in fees in Portland?
Total SDCs range from approximately $11,000 to $19,000 depending on ADU size and location. BDS permit fees and the school construction excise tax are additional. Affordable deed-restricted ADUs may qualify for reductions.
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