Yes: Beaverton allows one accessory dwelling unit with any single-detached house in every residential zone (MR, RMA, RMB, RMC; Table 20.05.20.A) through a Type 1 staff-level land-use application (Development Code 40.05.15) plus a building permit. The standards in Code section 60.50.03 cap the ADU at 800 sq ft of floor area, except that converting a whole basement, attic or upper floor of the house is exempt from the cap. A one-story ADU no taller than 15 ft may sit 5 ft from the rear lot line; a detached unit must be 6 ft from the house and cannot sit over an easement. Beaverton requires no off-street parking for any use (60.30.10, since Aug 2023) and Oregon law (ORS 197A.425) bars owner-occupancy conditions. City, park-district, Clean Water Services and county SDCs apply; get a written estimate before design.
Zoning & Size Requirements [1][2][3][4][5][6][7][8]
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 | Permitted (P) in all four residential zones, MR, RMA, RMB and RMC (Table 20.05.20.A, row 2.A), on a lot whose principal use is a single-detached dwelling (40.05.10; 60.50.03.2.A). In MR only an existing house (as of June 30, 2022) qualifies, since new single-detached dwellings are prohibited there. ADUs also appear in the commercial (20.10.20), multiple-use (20.22.20) and downtown (70.15.20) use tables; check the row for your zone. |
| Max Size (Detached) | 800 sq ft of floor area (60.50.03.2.C.1). No percentage-of-house rule. A detached ADU can be a new building or a manufactured home (60.50.03.2.B.3). An ADU added to a house that existed on June 30, 2022 is excluded from the zone's floor-area-ratio cap (60.50.03.2.C.4); an ADU built with a new house counts toward FAR (1.40 RMA, 0.80 RMB, 0.60 RMC for single-detached, Table 20.05.15.H.1). |
| Max Size (Attached) | 800 sq ft of floor area (60.50.03.2.C.1), measured after the ADU is carved out (2.C.3). Exception: an ADU created by converting an entire level or floor of the house (basement, attic or second story) may occupy the whole level with no size cap, provided no new floor area is added at the same time (60.50.03.2.C.2). An ADU built by adding floor area to an accessory structure needs its own exterior entrance (60.50.03.2.D). |
| Max Size (JADU) | N/A: Oregon and Beaverton have no junior-ADU category. A conversion inside the house is simply an ADU under 60.50.03; if a second unit fits both the ADU and the duplex definition the owner chooses which to apply for (Ch. 90, Dwelling Types). |
| Max Height | The zone height limit applies: 40 ft in RMA, 35 ft in RMB and RMC (Table 20.05.15.G.1; RMB/RMC also subject to the 20.30 height limits); MR uses the height-transition standards of 60.05.15.7. To use the 5 ft rear-setback option the ADU must be one story and no more than 15 ft above finished grade (60.50.03.2.E.2). |
| Max Units | One ADU per single-detached dwelling (60.50.03.2.A; Ch. 90 defines an ADU as 'an additional dwelling unit'). A third unit makes the property a triplex under the middle-housing rules instead. ADUs are not allowed on child lots created by a middle housing land division (40.45.15.10.F.1.c.iii). Duplex-to-quadplex, townhouse and cottage-cluster options exist separately under HB 2001. |
Setback Requirements [1][2][3][4][5][6][7][8]
Beaverton requires a rear setback of about 15 ft for a detached ADU, and parking requirements vary by unit size or location. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | 15 ft in RMA, RMB and RMC (Table 20.05.15.F.3), reduced to 5 ft for a one-story ADU no taller than 15 ft measured from finished grade (60.50.03.2.E.2). No ADU may be placed over any easement (60.50.03.2.E.3). |
| Side Setback | Table 20.05.15.F.2 (as amended by ORD 4879, Apr 2026) lists 5 ft from a perimeter lot line and 3 ft from internal lot lines created by a land division; a detached ADU must also keep 6 ft from the house and other buildings on the lot (60.50.03.2.E.1; Table 20.05.15.F.6). Confirm the side yard for your lot with the Planning Division. |
| Front Setback | 10 ft minimum front yard in all residential zones (Table 20.05.15.F.1.a); a garage face must be at least 18.5 ft back in RMB and RMC (F.4.b). ADUs are normally placed behind the house, so the rear and side rules govern. |
| Parking Required | None. Beaverton removed minimum parking for every use in August 2023 (Development Code 60.30.10, ORD 4844), and ORS 197A.425(1)(b)(B) separately bars cities from requiring extra off-street parking for an ADU. Any spaces you do build must be 8.5 ft by 18.5 ft; up to two may sit in the front yard (60.30.10). |
| Owner Occupancy | Not required. Section 60.50.03 contains no owner-occupancy rule and ORS 197A.425(1)(b)(B) (formerly ORS 197.312(5)) prohibits cities from imposing one; the state exception lets cities restrict short-term rental of ADUs, so ask the city before listing the unit for stays under 30 days. |
| Min Lot Size | No ADU-specific minimum lot size (60.50.03 sets none). The minimum lot areas in Table 20.05.15.B (1,500 sq ft RMA, 3,000 RMB, 5,000 RMC for a single-detached lot) apply to land divisions and middle housing, not to adding an ADU to an existing lot (footnote 2). The application must be filed by the owner or the owner's agent (40.05.15.1.D). |
Permit Process & Fees [9][10][11]
An ADU permit in Beaverton goes through a standard permit review. Review time: not published. The Type 1 ADU decision is made by the Director without a hearing (40.05.15.1.B; procedure in 50.35), then building plan review follows; confirm current turnaround times with Beaverton Planning and Building before scheduling a contractor. Permit fees: The ADU land-use fee is set in the Citywide Comprehensive Fee Schedule (Exhibit A to the fee resolution) and the building permit is valuation-based (Building Permit Fee Schedule B70-1108); both PDFs were behind a bot check on 9/20/2026, so confirm current figures with Community Development.
| Approval Process | Two steps: (1) a Type 1 Accessory Dwelling Unit land-use application to the Community Development Director under Development Code 40.05.15 (no hearing, no neighbor notice; criteria are consistency with Chapters 20 and 60 and a complete submittal per 50.25), filed by the owner or agent through the Beaverton Electronic Permitting System (BEPS); then (2) a building permit with plumbing, electrical and mechanical permits, built to the Oregon Residential Specialty Code (60.50.03.2.E.4). A pre-application conference can be used to fix the submittal list (40.05.15.1.D). |
| Review Timeline | Not published. The Type 1 ADU decision is made by the Director without a hearing (40.05.15.1.B; procedure in 50.35), then building plan review follows; confirm current turnaround times with Beaverton Planning and Building before scheduling a contractor. |
| Permit Fees | The ADU land-use fee is set in the Citywide Comprehensive Fee Schedule (Exhibit A to the fee resolution) and the building permit is valuation-based (Building Permit Fee Schedule B70-1108); both PDFs were behind a bot check on 9/20/2026, so confirm current figures with Community Development. |
| Impact Fees | System Development Charges from the city (transportation, water), Tualatin Hills Park & Recreation District, Clean Water Services (sanitary/stormwater) and Washington County (Transportation Development Tax) apply to a new dwelling unit; ADU treatment and any reductions are in the city's SDC handout B70-1116, unreachable on 9/20/2026. Ask the Site Development Division for a written SDC estimate before design. |
| Plan Check | Structural, energy, fire-separation and plumbing plan review is part of the building permit (Building Division); the land-use decision under 40.05.15 checks zoning only. Detached ADUs must be 6 ft from other buildings or meet the Residential Specialty Code's fire-separation rules. |
| Pre-Approved Plans | No Beaverton pre-approved ADU plan program was found on the city's site or in the Development Code as of Sept 2026; confirm with the Planning Division before assuming one exists. |
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Construction Costs [12][13]
Building an ADU in Beaverton typically costs $165,000-$300,000 ($200-$420 per sq ft); a garage conversion runs $70,000-$160,000.
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| Average Build Cost | $165,000-$300,000 |
| Cost per Sq Ft | $200-$420 |
| Garage Conversion | $70,000-$160,000 |
| Prefab ADU (Installed) | $100,000-$240,000 |
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Rental Income Potential [14]
A 2-bedroom ADU in Beaverton rents for around $1,600-$1,900/mo, an estimated 5-8% gross rental yield on a $165,000-$300,000 build at $1,400-$1,900/mo (estimate before taxes, vacancy and financing).
| Avg Rent (1 Bedroom) | $1,400-$1,650/mo |
| Avg Rent (2 Bedroom) | $1,600-$1,900/mo |
| Short-Term Rental | Not verified. |
| Est. Annual ROI | 5-8% gross rental yield on a $165,000-$300,000 build at $1,400-$1,900/mo (estimate before taxes, vacancy and financing) |
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Recent Law Changes
What's Changed Recently
- Verified Sept 20, 2026: the ADU standards in Development Code 60.50.03 were last amended by ORD 4859 (effective Jan 2, 2025). The 2025 Code Maintenance ordinance (ORD 4876, Jan 20, 2026) and the Designing Walkable Places ordinance (ORD 4879, Apr 2, 2026) changed the parking and residential site-standard tables but left the ADU section, the Type 1 application (40.05.15) and the 800 sq ft cap intact. Correction: this page previously stated an '800 sq ft or 50% of the house' cap; the code has set a flat 800 sq ft since ORD 4822 (June 30, 2022)
- No minimum parking anywhere in Beaverton: ORD 4844 (August 2023) rewrote 60.30.10 so that 'no minimum parking is required for any use', going beyond the state's ADU-only parking ban
- Oregon HB 2138 (2025 session, passed June 2025): Sections 7-12 make any recorded CC&R or HOA rule that blocks an ADU or middle housing inside an urban growth boundary void and unenforceable, including instruments recorded before 2021; the change is operative Jan 1, 2027
- The state ADU mandate was renumbered: former ORS 197.312(5)-(6) is now ORS 197A.425. It still requires every city over 2,500 people to allow at least one ADU per detached house in single-family zones and bars owner-occupancy and extra-parking requirements (short-term rentals excepted)
- ORD 4857 (Oct 3, 2024, Code Maintenance Project) consolidated the residential zones into MR, RMA, RMB and RMC and updated the 40.05.15 approval criteria to cross-reference Chapter 20 (Zoning Districts); ADUs are Permitted in all four zones
- Housing Options Project (ORD 4804, Aug 2021; ORD 4822, June 30, 2022) implemented HB 2001: duplexes through cottage clusters allowed on single-detached lots, the ADU section rewritten with the flat 800 sq ft cap, the whole-floor conversion exemption, the 5 ft rear-setback option, and ADUs added to houses existing on June 30, 2022 excluded from FAR
Tips for Building an ADU in Beaverton
- The 800 sq ft cap is on floor area, but converting an entire basement, attic or second story of the house is exempt (60.50.03.2.C.2) as long as you add no new square footage in the same project; a full basement ADU can exceed 800 sq ft
- A one-story detached ADU no taller than 15 ft can sit 5 ft from the rear line instead of 15 ft (60.50.03.2.E.2); keep it 6 ft from the house and off every easement, and ask Planning which side-yard figure in Table 20.05.15 applies to your lot
- If your house was built after June 30, 2022, the ADU counts toward the zone's FAR cap (0.60 in RMC, 0.80 in RMB, 1.40 in RMA); on a 7,000 sq ft RMC lot a 2,800 sq ft house already uses 0.40, leaving room for 800 sq ft. Houses existing on that date are exempt
- Get the SDC estimate first: city, THPRD, Clean Water Services and Washington County TDT charges are levied per dwelling unit and are often the largest single line item after construction; the city's handout is B70-1116
- Cost basis: an industry guide verified July 2026 puts Beaverton at about $275 per sq ft ($200-$420 range), roughly $165,000 for 600 sq ft and $110,000 and up for a garage conversion; Portland-metro guides dated July 2026 show $180,000-$280,000 for a detached build. Rents are Zumper's Sept 20, 2026 Beaverton medians ($1,425 1BR, $1,625 2BR) with a new-build premium
- Cost basis (2026-09-20 re-verification): short term allowed: Not verified. Oregon law lets cities restrict short-term rental of ADUs while banning owner-occupancy rules (ORS 197A.425), and no ADU-specific STR rule appears in Development Code 60.50.03; check Beaverton's business-license and any transient-lodging requirements with the city before listing stays under 30 days.
ADU Builders in Beaverton
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Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Beaverton Development Code 60.50.03 Accessory Dwelling Unit (size, entrance, location standards; effective Jan 2, 2025) Municipal Code — Accessed 2026-09-20
- Beaverton Development Code Table 20.05.20.A Residential Land Uses (ADUs Permitted in MR, RMA, RMB, RMC) Municipal Code — Accessed 2026-09-20
- Beaverton Development Code 20.05.15 Residential Site Development Standards (setbacks, height, FAR) Municipal Code — Accessed 2026-09-20
- Beaverton Development Code 60.30.10 Number of Parking Spaces (no minimum parking for any use) Municipal Code — Accessed 2026-09-20
- Beaverton Development Code Chapter 90 Definitions, Dwelling Types (ADU definition) Municipal Code — Accessed 2026-09-20
- Beaverton Development Code Ordinance History Table (ORD 4857, 4859, 4876, 4879) Municipal Code — Accessed 2026-09-20
- ORS 197A.425 Accessory dwelling units (formerly ORS 197.312(5)-(6)) state_statute — Accessed 2026-09-19
- Oregon HB 2138 (2025), Enrolled state_statute — Accessed 2026-09-19
- Beaverton Development Code Chapter 40 (Sept 17, 2025 print), 40.05.15 Accessory Dwelling Unit Application (Type 1) Municipal Code — Accessed 2026-09-19
- City of Beaverton, Building in Beaverton: Fee Information government — Accessed 2026-09-20
- City of Beaverton, System Development Charges handout B70-1116 government — Accessed 2026-09-20
- Beaverton, OR ADU Guide: Permits, Costs & Rules (data verified 2026-07-12), Build With A Plan industry — Accessed 2026-09-20
- ADU Cost Portland 2026 (published July 28, 2026), PDX Remodeling & Design industry — Accessed 2026-09-19
- Average Rent in Beaverton, OR (updated Sept 20, 2026), Zumper Market Data — Accessed 2026-09-20
Frequently Asked Questions
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