Accessory Dwelling Unit Permits - Portland

Housing and Building Standards Oregon 3 Minutes Read ยท published February 08, 2026 Flag of Oregon

Portland, Oregon homeowners considering an accessory dwelling unit (ADU) must follow local permitting, zoning, and building rules administered by the City of Portland. This guide explains typical permit steps, zoning and size considerations, inspection points, enforcement pathways, and practical actions you can take to apply, pay fees, and appeal decisions. It summarizes common requirements used by the Bureau of Development Services and planning staff, highlights where code or agency guidance does not publish specific penalties or fee amounts, and points to official City resources for forms and contacts.

Permit steps for an ADU

  • Prepare site plan, floor plans, and elevation drawings that comply with Portland zoning and building standards.
  • Confirm lot zoning, setbacks, and maximum ADU size with the City of Portland zoning rules and property records.
  • Submit a building permit application to the Bureau of Development Services with required plans and statements.
  • Pay application and permit fees when invoiced; fee amounts vary by scope and are listed on official fee schedules.
  • Arrange required inspections during construction and obtain final inspection and certificate of occupancy or final inspection sign-off.
  • Contact BDS or planning staff for zoning interpretations, pre-application meetings, or to ask about exception processes.
Start with a pre-application meeting to reduce review delays.

Size limits and zoning considerations

Maximum ADU size, allowed locations on a lot, and whether an ADU is attached or detached depend on the lot's zoning designation and the City of Portland development standards. Some zones have explicit numeric maximums for gross floor area or living area, while others use lot coverage and setback rules that affect buildable area. Where a numeric limit is not published on public guidance pages, applicants must rely on zoning staff interpretations and the development standards applicable to the parcel.

Check your lot's zoning before preparing final plans.

Penalties & Enforcement

Enforcement of ADU-related violations in Portland is carried out by the Bureau of Development Services and related code enforcement units; enforcement may also involve the City Attorney for escalated matters. Public guidance pages and permit instructions describe enforcement pathways but do not always list specific fine amounts or escalation schedules in one consolidated place.

  • Fine amounts: not specified on the public guidance pages consulted; see official enforcement contacts for exact figures.
  • Escalation: first, repeat, and continuing offences are subject to administrative actions; specific schedules are not published on general ADU guidance pages.
  • Non-monetary sanctions: stop work orders, required corrective permits, demolition or removal orders, lien filings, or court actions may be used.
  • Enforcer and complaints: Bureau of Development Services handles permitting and many complaints; use the official BDS contact and complaint pages to file a report.
  • Appeals and review: permit decisions and enforcement orders typically have administrative appeal routes; time limits for appeals are set in the applicable code or permit notice and vary by action.
If you receive a notice, read the appeal deadline on the notice carefully and act promptly.

Applications & Forms

  • Building permit application: submit plans and application forms to the Bureau of Development Services; specific form numbers vary by permit type.
  • Fees: permit fees depend on valuation and scope; check the official BDS fee schedule for current amounts.
  • Submission: online or in-person permit submittal options are available through City of Portland permit portals and BDS counters.

How-To

  1. Confirm zoning and lot-specific standards using Portland property/zoning lookup and a zoning staff contact.
  2. Assemble professional plans (site plan, floor plans, elevations) that show compliance with setbacks, parking rules, and size limits.
  3. Submit a complete building permit application to BDS with all required documents and pay applicable fees.
  4. Complete construction with required inspections and obtain final sign-off or certificate of occupancy.
  5. If denied or issued an enforcement notice, follow the appeal instructions on the decision notice and consider requesting a review or variance if available.
Early coordination with planning and BDS staff reduces costly rework.

FAQ

Do I need a separate address and utility connections for an ADU?
An ADU frequently requires separate utility connections and may require a separate address depending on how it will be used; consult BDS and utility providers early in planning.
Can I rent my ADU long-term or use it as short-term rental?
Long-term rental is generally allowed, but short-term rentals may be subject to separate licensing and rules; check Portland's short-term rental requirements and licensing rules.
What is the maximum allowed ADU size in Portland?
Maximum size depends on zoning and specific development standards for the lot; a single numeric maximum may not appear on general guidance pages for all zones.

Key Takeaways

  • Start with zoning confirmation and a pre-application meeting to identify size and setback constraints.
  • Submit complete plans to the Bureau of Development Services to avoid delays in review and inspections.

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