Beaverton allows one ADU per detached single-family dwelling in any zoning district that permits single-detached homes — including several commercial districts — via a simple Type 1 (ministerial) application. Oregon state law (SB 1051/HB 2001, ORS 197.312) bars the city from requiring owner occupancy or extra off-street parking. ADUs are capped at the lesser of 800 sq ft or 50% of the primary dwelling's gross floor area, one of the tighter size limits in the Portland metro.
Zoning & Size Requirements [1][2]
Yes — Beaverton allows ADUs. A detached ADU can typically be up to 800 sq ft under current Oregon and Beaverton zoning rules.
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| Allowed Zones | Any zoning district that allows a single-detached dwelling as the principal use, including residential (R/MR) and several commercial districts (per Ch. 20 land-use tables) |
| Max Size (Detached) | 800 sq ft or 50% of the primary dwelling's gross floor area, whichever is less |
| Max Size (Attached) | 800 sq ft or 50% of the primary dwelling's gross floor area, whichever is less |
| Max Size (JADU) | N/A (Oregon does not use a JADU category) |
| Max Height | Per the underlying zone's accessory-structure/dwelling standards — Confirm with Beaverton Planning Division |
| Max Units | 1 ADU per detached dwelling unit (duplex/triplex/cottage-cluster options exist separately under HB 2001 middle-housing code); ADUs not permitted on middle-housing land-division child lots |
Setback Requirements [1][2]
Beaverton requires a rear setback of about the required distance for a detached ADU, and no additional parking is required. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | Per underlying zone accessory-structure standards — Confirm with Beaverton Planning Division |
| Side Setback | Per underlying zone accessory-structure standards — Confirm with Beaverton Planning Division |
| Front Setback | Per underlying zone — Confirm with Beaverton Planning Division |
| Parking Required | No additional off-street parking may be required (ORS 197.312, SB 1051/HB 2001) |
| Owner Occupancy | Not required — Oregon law prohibits owner-occupancy conditions on ADUs |
| Min Lot Size | No ADU-specific minimum; requires an existing detached dwelling as principal use |
Permit Process & Fees [3]
An ADU permit in Beaverton typically costs Type 1 application fee plus valuation-based building permit fees (third-party guides estimate $2,500-$9,000) — Confirm with Beaverton Building Division and takes Commonly 2-4 months total from application to permit issuance — Confirm with Beaverton Planning Division, through a ministerial, by-right review.
| Approval Process | Type 1 land use application (Development Code 40.05.15, Director decision, ministerial) plus building permit |
| Review Timeline | Commonly 2-4 months total from application to permit issuance — Confirm with Beaverton Planning Division |
| Permit Fees | Type 1 application fee plus valuation-based building permit fees (third-party guides estimate $2,500-$9,000) — Confirm with Beaverton Building Division |
| Impact Fees | System Development Charges (city, Washington County TDT, Clean Water Services) apply and can add five figures — Confirm current SDC schedule with Beaverton Site Development |
| Plan Check | Included in building permit review — Confirm with Beaverton Building Division |
| Pre-Approved Plans | No city pre-approved plan library — Confirm with Beaverton Planning Division |
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Construction Costs [4][5]
Building an ADU in Beaverton typically costs $150,000-$320,000 ($150-$300 per sq ft); a garage conversion runs $100,000-$180,000.
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| Average Build Cost | $150,000-$320,000 |
| Cost per Sq Ft | $150-$300 |
| Garage Conversion | $100,000-$180,000 |
| Prefab ADU (Installed) | $100,000-$240,000 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
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Rental Income Potential [6][7]
A 2-bedroom ADU in Beaverton rents for around $1,700-$2,000/mo, an estimated 6-8% annual return.
| Avg Rent (1 Bedroom) | $1,400-$1,700/mo |
| Avg Rent (2 Bedroom) | $1,700-$2,000/mo |
| Short-Term Rental | No statewide ban; check Beaverton business-license and any STR requirements — Confirm with the City of Beaverton |
| Est. Annual ROI | 6-8% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
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Recent Law Changes
What's Changed Recently
- Beaverton's Housing Options Project (ORD 4804, Aug 2021; ORD 4822, June 2022) implemented Oregon HB 2001 middle housing — duplexes through cottage clusters now allowed alongside ADUs
- ADUs added to a single-detached dwelling existing as of June 30, 2022 are excluded from maximum floor-area-ratio (FAR) calculations
- Oregon HB 2138 (signed July 2025): voids private CC&R/HOA covenants restricting ADUs and middle housing, operative Jan 1, 2027
- ORD 4857 (Oct 2024) updated ADU application approval criteria cross-references in Development Code Section 40.05
Tips for Building an ADU in Beaverton
- Beaverton's 800 sq ft / 50% cap is tighter than Portland's 75% rule — design efficiently or consider a basement conversion
- The Type 1 procedure is ministerial (no hearing, no neighbor notice) — a complete application is the main gate; book a pre-application conference
- Ask about SDC estimates early: Washington County transportation and Clean Water Services charges can rival the city permit fees
- No owner-occupancy and no parking mandates apply statewide, so the ADU can be a straightforward long-term rental
ADU Builders in Beaverton
Looking for an ADU builder in Beaverton? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Beaverton homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Beaverton Development Code — Dwelling Types (ADU standards) Municipal Code — Accessed 2026-07-10
- Beaverton Development Code — Chapter 40 (Section 40.05 Accessory Dwelling Unit) Municipal Code — Accessed 2026-07-10
- Beaverton Development Code Chapter 40 (Sept 2025 print) — 40.05.15 ADU Application Municipal Code — Accessed 2026-07-10
- Beaverton, OR ADU Guide: Permits, Costs & Rules — Build With A Plan industry — Accessed 2026-07-10
- Beaverton, OR ADU Information — GatherADU industry — Accessed 2026-07-10
- Average Rent in Beaverton, OR — RentCafe Market Data — Accessed 2026-07-10
- Average Rent in Beaverton, OR — Zumper Market Data — Accessed 2026-07-10
Frequently Asked Questions
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