How big can a Kirkland ADU be?
✓ Verified against code · August 19, 2026
1,200 sq ft of gross floor area — with meaningful exclusions: sub-5-ft-ceiling space, uncovered decks and patios, and up to 200 sq ft of exterior elements don't count. National guides quoting 1,000 sq ft are citing the state floor, not Kirkland's adopted limit.
Citation: KZC 115.07(4)
How current is this?
Kirkland’s ADU rules run under KZC 115.07 (Kirkland Zoning Code) (Ordinances O-4905 / O-4913). Kirkland's 2025 middle-housing and state-conformance ordinances (O-4905, O-4913) updated KZC 115.07. Kirkland pairs its rules with the most homeowner-friendly tooling in the region: a full ADU Toolkit microsite and an active pre-approved DADU plan gallery. We verified this answer against primary sources on August 19, 2026, and every change we catch is logged in the changelog.
More Kirkland ADU questions
- Does a Kirkland DADU count against floor-area limits?
- Do I need parking for a Kirkland ADU?
- Can I use a pre-approved DADU plan in Kirkland?
- Can a Kirkland ADU be sold separately?
All Kirkland ADU rules → · Compare Washington cities →
Not legal advice — lot-specific overlays can change the answer for your parcel. The citation above points at the governing code section; check it, or ask the city to confirm.