Vancouver ADU Zoning Rules & Permit Guide

ADU Regulations in Vancouver, Washington

Updated September 29, 2026

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.

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

Frequently 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.

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 are the setback requirements for an ADU in Vancouver?

ADUs in Vancouver generally require setbacks of 5 ft rear, 5 ft side. Washington's HB 1337 (2023) limits how restrictive local ADU rules can be, but the exact setback figures come from Vancouver's own land use code — confirm them with the city before you design.