Kirkland ADU Zoning Rules & Permit Guide

ADU Regulations in Kirkland, Washington

Updated September 29, 2026

On the northeastern shore of Lake Washington in King County, Kirkland's ADU program benefits from Washington's HB 1337. The city's popular downtown and waterfront areas may trigger additional design review requirements.

Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Kirkland as of 2026. Regulations are governed by Washington's HB 1337 (2023) which limits local ADU restrictions statewide.

Additional Local Requirements for Kirkland

• ADU by right in most residential zones
• Minimum 200 sq ft
• Design review for waterfront properties
• Parking waived in transit zones (HB 1337)

Frequently Asked Questions About ADUs in Kirkland

Can I build an ADU in Kirkland?

Kirkland allows ADUs under Washington state law. Waterfront properties may need additional design review.

What is the maximum ADU size allowed in Kirkland?

ADUs in Kirkland can be up to 1,000 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Kirkland planning department before designing your project.

What are the setback requirements for an ADU in Kirkland?

ADUs in Kirkland 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 Kirkland's own land use code — confirm them with the city before you design.