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
| 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
| 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
| 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 (installed) |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders in minutes.
Compare ADU Financing Options →Rental Income Potential
| 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. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Streamlined master use permit process for ADUs
- 2023: Expanded JADU allowance in many neighborhoods
- 2024: Increased max detached ADU size to 1,050 sq ft
- 2023: Reduced setback requirements for infill projects
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
Frequently Asked Questions
Can I build an ADU in Vancouver?
Yes. ADUs are allowed in Residential single-family zones in Vancouver. The maximum size for a detached ADU is 1,050 sq ft. No owner-occupancy is required.
How much does an ADU cost in Vancouver?
ADU construction in Vancouver typically costs $135,000-$270,000. Garage conversions run $65,000-$155,000, and prefab ADUs cost $95,000-$220,000 (installed).
How much can I rent an ADU for in Vancouver?
Average ADU rents in Vancouver are $1,250-$1,700/mo for a 1-bedroom and $1,600-$2,300/mo for a 2-bedroom unit.
Do I need parking for an ADU in Vancouver?
1 space (optional). 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?
The permit review timeline in Vancouver is 45-65 days. Fees range from $1,900-$3,200.
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