Yes. Vancouver allows up to two ADUs (attached, detached, or converted from existing space) on any lot with a house, duplex, triplex, fourplex, townhome or rowhome in its Low-Scale (LS) and Medium-Scale (MS) Neighborhood districts, by residential building permit with no land-use hearing. Under the Title 20 rewrite in force since July 31, 2026 (Ord. M-4533), a house plus ADUs is reviewed as the Flex-Plex building type (VMC 20.420.100): 5-ft side and rear setbacks (0 ft to an alley), a 5-20 ft front build-to line, up to 3 floors and 45 ft in LS, no minimum lot size and no parking requirement. A unit counts as an ADU when it is 1,000 sq ft or less (VMC 20.150 definition); a bigger unit is still allowed but as an ordinary middle-housing unit at full impact fees. ADU impact fees are 50% of the principal dwelling's (VMC 20.450.030) - about $4,100-$6,300 in the Vancouver and Evergreen school district areas - and the owner does not have to live on the property.
In Vancouver you will also hear an ADU called a DADU — short for detached accessory dwelling unit, the usual term across Washington. The rules on this page apply either way.
Zoning & Size Requirements [1][2][3][4][5][6]
Yes — Vancouver allows ADUs. A detached ADU can typically be up to 1,000 sq ft under current Washington and Vancouver zoning rules.
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| Allowed Zones | Low-Scale Neighborhood (LS) and Medium-Scale Neighborhood (MS) districts, on any lot with a single-family house, duplex, triplex, fourplex, townhome or rowhome (VMC 20.150 definition; Flex-Plex building type allowed in LS, MS, MX, IC and MH per Table 20.420.100-1). Possible but less practical in the Mixed-Use Neighborhood (MX) district because of its higher minimum density (City ADU page). In cottage courts an ADU may only be inside the home (VMC 20.450.080.A.6.c). |
| Max Size (Detached) | 1,000 sq ft or less to count as an ADU (VMC 20.150 definition; City ADU page). A larger detached unit is still allowed, but it is treated as a regular middle-housing unit and pays full impact fees. The only floor is the Washington State Building Code minimum for a dwelling unit. |
| Max Size (Attached) | 1,000 sq ft or less to count as an ADU, attached or interior (VMC 20.150; City ADU page). Larger attached units are allowed as ordinary middle-housing units at full impact fees. Attached ADUs need 1-hour fire-rated and STC/IIC 45 sound separation from the main unit (City ADU page, building code requirements). |
| Max Size (JADU) | N/A - Washington has no JADU category. The closest thing is an interior-conversion ADU built entirely inside an existing home: it may skip the fire and sound separation if hard-wired, interconnected smoke alarms are installed throughout, with 6 ft 8 in finished ceilings and legal egress windows (City ADU page). This applies to one ADU only. |
| Max Height | Low-Scale Neighborhood: 3 floors above adjacent grade and 45 ft (VMC 20.410.050.D). Medium-Scale Neighborhood: 75 ft (20.410.060.D). The Flex-Plex building type takes the district height (20.420.100.E) and no lot buffer applies between LS lots (Table 20.410.150). No height maximum within 1/4 mile of bus rapid transit or light rail (20.420.100.G.3, Station Areas overlay). |
| Max Units | Two ADUs per lot, attached, detached or any mix (City ADU page; VMC 20.420.100.A; RCW 36.70A.681(1)(a)). More units may be built on the same lot under the middle-housing rules (up to 6 in a Flex-Plex, 3 or fewer floors, still a residential building permit), but only two count as ADUs for the 1,000 sq ft cap and the 50% impact fee. |
Setback Requirements [1][2][3][4][5][6]
Vancouver requires a rear setback of about 5 ft 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 | 5 ft minimum from the rear lot line; 0 ft from an alley (VMC 20.420.100.D, Flex-Plex building type). A detached ADU must also sit 10 ft from every other structure on the lot - house, garage, sheds, decks and stairs - or meet extra fire-code separation such as sprinklers or 1-hour rated construction (City ADU page). |
| Side Setback | 5 ft minimum from an adjacent lot line; zero lot line is allowed between buildings on the same lot (VMC 20.420.100.D). On a corner lot the side-street build-to line is 5-18 ft from the lot line with at least 50% of that facade built to it. |
| Front Setback | Front build-to line 5-20 ft from the primary-street lot line, with at least 60% of the front facade within that band (VMC 20.420.100.D). A backyard ADU behind the house does not face the street, so the band is met by the house. Parking may not sit in front of the front building line except directly in front of a garage (20.420.100.F). |
| Parking Required | None required. Table 20.450.045-3 sets 'None Required' for all residential uses citywide, so an ADU needs no parking space anywhere in Vancouver - broader than the RCW 36.70A.681(2) half-mile-of-transit floor. If you build parking it must be reached from a side street or alley where one exists, and on the primary street may only sit in front of a garage, outside sight triangles (VMC 20.420.100.F). |
| Owner Occupancy | Not required. The City ADU page states the owner is not required to live on the property, matching RCW 36.70A.681(1)(b); an ADU may be rented, used by family or sold as an individual unit. A long-term rental ADU must be registered with the City each year ($30 per unit from January 1, 2026); a short-term rental needs a City STR permit. |
| Min Lot Size | None. The Flex-Plex building type has no minimum lot size, width or depth (VMC 20.420.100.C; maximum lot 40,000 sq ft). Impervious surface is capped at 65% of the lot for up to 3 units and 75% for 4-6 units, and 10% of the lot must be open space (setback areas count). |
Permit Process & Fees [7][8][9][10][11][12]
An ADU permit in Vancouver goes through a standard permit review. The City publishes no review-time target for residential building permits. Allow time for the Request for Utility Services report before applying; independent 2026 Washington guides quote 8-16 weeks for ADU permit review. Permit fees: About $3,000-$4,600 in building and plan-review fees for a 500-1,000 sq ft ADU (2026 fee schedule: valuation-based Table I permit fee x 160% single permit, plus 50% plan review, $32 issuance, $6.50 state fee and $66.25 planning review), before impact fees and any water/sewer SDCs.
| Approval Process | Residential building permit (RES) only - no land-use application, hearing or design review for 1-6 units on one lot with 3 or fewer floors (City Middle Housing page; VMC 20.420.100). First file the free Request for Utility Services (RUS), which reports water/sewer capacity and whether a civil engineering (ENG) review is needed; then apply in ePlans with the New Housing / New ADU application and Residential Housing submittal checklist. Planning review of the ADU is a $66.25 line on the RES permit (2026 fee schedule, Land Use Review 19.A.2). |
| Review Timeline | The City publishes no review-time target for residential building permits. Allow time for the Request for Utility Services report before applying; independent 2026 Washington guides quote 8-16 weeks for ADU permit review. |
| Permit Fees | About $3,000-$4,600 in building and plan-review fees for a 500-1,000 sq ft ADU (2026 fee schedule: valuation-based Table I permit fee x 160% single permit, plus 50% plan review, $32 issuance, $6.50 state fee and $66.25 planning review), before impact fees and any water/sewer SDCs. |
| Impact Fees | 50% of the principal dwelling's fees (VMC 20.450.030.I.5): about $4,100-$6,300 for an ADU in the Vancouver and Evergreen school district areas (park $3,065 + traffic $1,003-$1,875 by TIF district + school $0-$1,393), up to about $10,300 in the Battle Ground SD portion; 2026 schedule, paid at permit issuance. Units over 1,000 sq ft pay full fees. |
| Plan Check | Electronic review through ePlans after review fees are paid. Building plan review is 50% of the single-permit fee (2026 Table V); an ENG civil review is added only if the Request for Utility Services report requires it. No published turnaround. |
| Pre-Approved Plans | None published by the City of Vancouver as of September 2026 - the City ADU page and residential-permit page list no pre-approved ADU plan sets (the City's 'Pre-Approved Building Code Alternatives' are construction details, not ADU plans). Confirm with the Permit Center (360-487-7800) before assuming a stock-plan discount. |
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Construction Costs [13][14][15]
Building an ADU in Vancouver typically costs $150,000-$350,000 ($200-$400 per sq ft); a garage conversion runs $60,000-$150,000.
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| Average Build Cost | $150,000-$350,000 |
| Cost per Sq Ft | $200-$400 |
| Garage Conversion | $60,000-$150,000 |
| Prefab ADU (Installed) | $135,000-$340,000 |
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Rental Income Potential [16][17][18]
A 2-bedroom ADU in Vancouver rents for around $1,750-$2,100/mo, an estimated 6-12% gross rental yield (e.g. $1,700/mo on a $200,000 build is about 10% before vacancy, taxes, the impact fee and financing); roughly 4-8% after expenses.
| Avg Rent (1 Bedroom) | $1,500-$1,800/mo |
| Avg Rent (2 Bedroom) | $1,750-$2,100/mo |
| Short-Term Rental | Allowed with a City short-term rental permit ($265 in the 2026 fee schedule, Section 30) plus Washington State and City of Vancouver business licenses, $1 million liability insurance and a mailed notice to abutting and a. |
| Est. Annual ROI | 6-12% gross rental yield (e.g. $1,700/mo on a $200,000 build is about 10% before vacancy, taxes, the impact fee and financing); roughly 4-8% after expenses |
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Recent Law Changes
What's Changed Recently
- July 31, 2026: Ord. M-4533 (adopted June 1, 2026 with the Our Vancouver 2026-2045 Comprehensive Plan and a new zoning map) repealed and replaced VMC Title 20. ADU standards moved from former VMC 20.810 into the Flex-Plex building type (20.420.100) in the new Low-Scale and Medium-Scale Neighborhood districts: 5-ft side and rear setbacks, 45-ft height in LS, no minimum lot size, no residential parking minimum citywide (Table 20.450.045-3) and the 50% ADU impact fee in 20.450.030
- January 1, 2026: Vancouver's rental registration program began - every long-term rental unit, including an ADU, must be registered annually at $30 per unit (ordinance adopted July 14, 2025; health and safety inspections planned from mid-2027)
- January 1, 2026: 2026 fee schedule in force (building permit Table I, plan review Table V, traffic impact fee $236-$420 per trip by district, park impact fee $6,130 and Vancouver SD school fee $2,786 per single-family unit; an ADU pays 50%); the fee sheets were re-issued July 31, 2026 for the Title 20 renumbering
- State floor unchanged: RCW 36.70A.681 (HB 1337, 2023) - two ADUs per lot, 1,000 sq ft, no owner-occupancy except for short-term rentals, impact fees at most 50% of the principal unit, condominium sale allowed, no parking within 1/2 mile of major transit. EHB 1345 (Ch. 231, Laws of 2026, effective June 11, 2026) applies only to county land outside urban growth areas - no effect inside Vancouver
- Vancouver no longer requires an ADU to be visually subordinate or aesthetically compatible with the main house, and no longer requires the owner to live on the property (City ADU page, 2026)
Tips for Building an ADU in Vancouver
- Cost basis: build cost and per-sq-ft ranges come from two Vancouver/Clark County builder guides (July 2026 and January 2025) and a 2026 statewide Washington cost guide; rents are anchored on HUD FY2027 Small Area FMRs for Vancouver ZIP codes 98660-98686 (1BR $1,510-$1,790, 2BR $1,730-$2,060), effective October 1, 2026. Get three bids - quotes vary 20-40% for the same scope.
- Size decides the fee bill: 1,000 sq ft or less is an ADU and pays 50% impact fees; 1,001 sq ft or more is an ordinary middle-housing unit at full impact fees (VMC 20.150; 20.450.030.I.5). If the main house already exists, the ADU fee is 50% of what the house would be charged today.
- Keep a detached ADU 10 ft from the house, garage, sheds, decks and stairs, or plan for sprinklers or 1-hour fire-rated construction (City ADU page).
- Utilities: file the free Request for Utility Services before designing. Water and sewer may be shared with the house with separate shutoffs; a separate 5/8-in meter costs $7,712.38 in water and sewer SDCs plus $5,010 for meter and service installation (2026 water/sewer charges). Each unit needs its own heating control and a separate lockable entrance.
- An attached or remodel ADU may qualify for the Clark County Assessor's 3-year home improvement exemption - apply before construction is finished (City ADU page).
- You may sell an ADU separately: the City ADU page says ADUs 'can be sold as individual units', via a unit-lot subdivision (VMC 20.320.100) or condominium, and RCW 36.70A.681(1)(j) bars cities from prohibiting it.
- Confirm your zoning district on the City's interactive zoning map first: ADUs are straightforward in Low-Scale and Medium-Scale Neighborhood; in Mixed-Use Neighborhood the minimum density makes a house-plus-ADU layout unlikely to pencil.
- Cost basis (2026-09-20 re-verification): short term allowed: Allowed with a City short-term rental permit ($265 in the 2026 fee schedule, Section 30) plus Washington State and City of Vancouver business licenses, $1 million liability insurance and a mailed notice to abutting and adjacent neighbors (City STR page; RCW 64.37). Rentals of 30+ nights instead register under the rental registration program ($30 per unit per year).
ADU Builders in Vancouver
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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.
- VMC Title 20 Land Use and Development Code (adopted June 1, 2026, effective July 31, 2026) - City-hosted PDF: 20.150 ADU definition, 20.410.050-.060 district heights, 20.420.100 Flex-Plex building type, 20.450.030.I.5 ADU impact fees, Table 20.450.045-3 parking Municipal Code — Accessed 2026-09-20
- ADU, Accessory Dwelling Units - City of Vancouver, WA Planning Department — Accessed 2026-09-20
- Middle Housing - City of Vancouver, WA (development standards, RES permit process) Planning Department — Accessed 2026-09-20
- Comprehensive Plan - Our Vancouver 2026-2045 Plan and Zoning Code Update (adopted June 1, 2026; effective July 31, 2026) Planning Department — Accessed 2026-09-20
- City Council adopts Comprehensive Plan to guide Vancouver's growth over the next 20 years (news release, June 2, 2026) government — Accessed 2026-09-20
- RCW 36.70A.681 - Accessory dwelling units, requirements (HB 1337, 2023) state_statute — Accessed 2026-09-20
- Building Permit Fees - City of Vancouver (Impact Fees tab: school, traffic and park fees per unit; water/sewer SDCs; effective 1/1/2026) Planning Department — Accessed 2026-09-20
- City of Vancouver Fee Schedule - Table I Building Permit Fees (effective 1/1/2026) Planning Department — Accessed 2026-09-20
- City of Vancouver Fee Schedule - Table V Plan Review and Other Fees (effective 7/31/2026) Planning Department — Accessed 2026-09-20
- City of Vancouver Fee Schedule - Planning, Development Engineering and Fire Review Fees (effective 7/31/2026; Land Use Review 19.A middle housing, Section 30 short-term rental) Planning Department — Accessed 2026-09-20
- Transportation Impact Fees (TIF) Frequently Asked Questions - updated January 2026 Planning Department — Accessed 2026-09-20
- Residential Building Permits - City of Vancouver (Request for Utility Services, New Housing / New ADU application) Planning Department — Accessed 2026-09-20
- Amplified Renovations - ADU Vancouver, WA: Rules, Permits & Costs (2026 Guide), July 24, 2026 industry — Accessed 2026-09-20
- Serden Group - ADU Permit Process in Clark County & Vancouver WA, January 15, 2025 industry — Accessed 2026-09-20
- ADU Wizard - How Much Does an ADU Cost in Washington in 2026? industry — Accessed 2026-09-20
- HUD FY2027 Fair Market Rents and Small Area FMRs - Portland-Vancouver-Hillsboro, OR-WA MSA (effective October 1, 2026) Government Data — Accessed 2026-09-20
- Short-Term Rentals (STR) - City of Vancouver, WA Planning Department — Accessed 2026-09-20
- Rental Registration Program - City of Vancouver, WA government — Accessed 2026-09-20
- VMC Title 20 Land Use and Development Code (City-hosted PDF of the code effective July 31, 2026) Municipal Code — Accessed 2026-09-20
- Washington ADU Legislation (HB 1337, 2023) - RCW 36.70A.681 State Law — Accessed 2026-09-20
Frequently Asked Questions
Can I build an ADU in Vancouver?
Yes. ADUs are allowed in Low-Scale Neighborhood (LS) and Medium-Scale Neighborhood (MS) districts, on any lot with a single-family house, duplex, triplex, fourplex, townhome or rowhome (VMC 20.150 definition; Flex-Plex building type allowed in LS, MS, MX, IC and MH per Table 20.420.100-1). Possible but less practical in the Mixed-Use Neighborhood (MX) district because of its higher minimum density (City ADU page). In cottage courts an ADU may only be inside the home (VMC 20.450.080.A.6.c). in Vancouver. The maximum size for a detached ADU is 1,000 sq ft or less to count as an ADU (VMC 20.150 definition; City ADU page). A larger detached unit is still allowed, but it is treated as a regular middle-housing unit and pays full impact fees. The only floor is the Washington State Building Code minimum for a dwelling unit.. Owner-occupancy is not required, so you can rent out the ADU.
How much does an ADU cost in Vancouver?
ADU construction in Vancouver typically costs $150,000-$350,000. Garage conversions run $60,000-$150,000, and prefab ADUs cost $135,000-$340,000.
How much can I rent an ADU for in Vancouver?
Average ADU rents in Vancouver are $1,500-$1,800/mo for a 1-bedroom and $1,750-$2,100/mo for a 2-bedroom unit.
Do I need parking for an ADU in Vancouver?
None required. Table 20.450.045-3 sets 'None Required' for all residential uses citywide, so an ADU needs no parking space anywhere in Vancouver - broader than the RCW 36.70A.681(2) half-mile-of-transit floor. If you build parking it must be reached from a side street or alley where one exists, and on the primary street may only sit in front of a garage, outside sight triangles (VMC 20.420.100.F).. Check with Vancouver planning department for the latest Washington ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Vancouver?
Vancouver does not publish a standard ADU review timeline. time target for residential building permits. Allow time for the Request for Utility Services report before applying; independent 2026 Washington guides quote 8-16 weeks for ADU permit review. Permit fees: About $3,000-$4,600 in building and plan-review fees for a 500-1,000 sq ft ADU (2026 fee schedule: valuation-based Table I permit fee x 160% single permit, plus 50% plan review, $32 issuance, $6.50 state fee and $66.25 planning review), before impact fees and any water/sewer SDCs.
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