Vancouver has progressive ADU policies with streamlined approval for detached units in residential zones. The city's proximity to Portland and reasonable housing costs make it attractive for ADU development and investment.
Zoning & Size Requirements [1]
| Allowed Zones | Residential single-family zones |
| Max Size (Detached) | 1,050 sq ft |
| Max Size (Attached) | 850 sq ft |
| Max Size (JADU) | 700 sq ft |
| Max Height | 35 feet |
| Max Units | 1 ADU per lot |
Setback Requirements [1]
| Rear Setback | 10 feet |
| Side Setback | 3 feet |
| Front Setback | 15 feet |
| Parking Required | 1 space (optional) |
| Owner Occupancy | Not required |
| Min Lot Size | 4,000 sq ft |
Permit Process & Fees
| Approval Process | Master use permit + building permit |
| Review Timeline | 45-65 days |
| Permit Fees | $1,900-$3,200 |
| Impact Fees | $700-$1,300 |
| Plan Check | 2-3 weeks |
| Pre-Approved Plans | Available |
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Construction Costs [2][3]
| Average Build Cost | $135,000-$270,000 |
| Cost per Sq Ft | $130-$260 |
| Garage Conversion | $65,000-$155,000 |
| Prefab ADU (Installed) | $95,000-$220,000 |
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 [4][5]
| Avg Rent (1 Bedroom) | $1,250-$1,700/mo |
| Avg Rent (2 Bedroom) | $1,600-$2,300/mo |
| Short-Term Rental | Permitted with license |
| Est. Annual ROI | 7-9% 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
- HB 1337 full implementation (2026): All urban growth areas must allow 2 ADUs per lot
- Seattle eliminated single-family zoning: Up to 4 homes per lot in NR zones
- No owner-occupancy requirement statewide (HB 1337 provision)
- Washington ADU permit fee caps now in effect for units under 1,000 sq ft
Tips for Building an ADU in Vancouver
- Portland proximity makes Vancouver attractive for Portland workers
- Lower property costs than Portland; better investment returns
- Short-term rental licensing available; explore vacation rental income
- Master use permit still required; factor 45-65 day timeline into planning
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Accessory Dwelling Units — City of Vancouver WA Planning Department — Accessed 2026-02-24
- HomeAdvisor — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- Vancouver Municipal Code 20.810.040 — ADU Standards Municipal Code — Accessed 2026-02-24
- Washington ADU Legislation (HB 1337) Government Data — Accessed 2026-02-24
Frequently Asked Questions
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