ADU Regulations in Vancouver, Washington
Across the Columbia River from Portland, Vancouver enforces ADU regulations under Washington state law with specific local adjustments. The city requires off-street parking and owner occupancy, with design standards that complement the region's Pacific Northwest aesthetic.
Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Vancouver as of 2026. Regulations are governed by Washington's HB 1337 (2023) which limits local ADU restrictions statewide.
| Regulation | Requirement |
|---|---|
| Maximum Size | 1,200 sq ft |
| Property Setbacks | 5 ft rear, 5 ft side |
| Extra Parking Required | Required (1 space) |
| Owner Occupancy | Required |
Additional Local Requirements for Vancouver
- Minimum ADU size: 200 sq ft
- Maximum height: 24 ft
- Off-street parking required unless exempt
- Only one ADU per lot
📥 Download the Complete Vancouver ADU Cheat Sheet
Get the step-by-step permit checklist, official government forms, direct planning department contacts, and estimated fees — all in one printable PDF for Vancouver, Washington.
Download the Complete Vancouver ADU Cheat Sheet — $12Frequently Asked Questions About ADUs in Vancouver
Can I build an ADU in Vancouver?
Vancouver, WA permits ADUs in residential zones. Owner occupancy is required and parking must be provided on-site.
How big can my ADU be in Vancouver?
What is the maximum ADU size allowed in Vancouver? ADUs in Vancouver can be up to 1,200 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Vancouver planning department before designing your project.
What about setbacks and other requirements in Vancouver?
What are the setback requirements for an ADU in Vancouver? ADUs in Vancouver generally require setbacks of 5 ft rear, 5 ft side. California state law (AB 68) limits local setback requirements to 4 feet for existing structures, but always verify with local zoning.
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