Kirkland's Building Setbacks & Zoning: The Rules That Matter

Every city handles building setbacks & zoning a little differently. In Kirkland, Washington, there are 3 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Lot Coverage Limits

Kirkland caps a single-family lot at 50 percent impervious lot coverage under KZC 15.30.060, the Density/Dimensions Table for the city's Low Density Residential zones. RSA-zoned lots share the 50 percent cap, but RSA 1 lots are held to just 30 percent under footnote DD-6.

Key details: Standard cap: 50% lot coverage. RSA 1 zone exception: 30% (footnote DD-6). Governing table: KZC 15.30 Density/Dimensions. Applies to: Detached Dwelling Unit, Low Density Residential zones. Coverage defined at: KZC 5.10.510.

Building permits are checked against the KZC 15.30 coverage figures before issuance, so a plan that exceeds 50 percent (or 30 percent on an RSA 1 lot) is rejected until the design is revised or a variance is obtained. Coverage installed without a permit, or a permitted structure later expanded past the cap, is enforceable through the City's code enforcement process under the Planning and Building Department, which can require removal or reduction of the excess impervious surface to bring the lot back into compliance.

Structure Height Limits

Kirkland limits detached house height to 25 feet above average building elevation (ABE) in RS, PLA 3C and PLA 6E zones, and to 30 feet in RSX, RSA and PLA 16 zones, under the KZC 15.30.060 Density/Dimensions Table. ABE is a calculated elevation, not the natural grade, computed under KZC 115.59, and a short list of features may exceed the cap.

Key details: RS/PLA 3C/PLA 6E max height: 25 ft above ABE. RSX/RSA/PLA 16 max height: 30 ft above ABE. Skylight exception: up to 6 inches over limit. Solar panel exception: 6 in sloped / 20 in flat roof. Peaked roof design review bonus: up to 5 feet.

Building a structure over the KZC 15.30.060 height cap without an applicable exception is a zoning violation subject to the City's general code enforcement process under Chapter 1.12 KMC. The City may issue a notice and order of civil violation carrying fines of $100 per day for the first 15 days of noncompliance, $250 per day for days 16 through 30, and $500 per day after that, capped at $50,000 per violation, plus a stop-work order under KMC 1.12.070.

Setback Rules

Detached single-family homes in Kirkland's Low Density Residential zones (RS, RSX, RSA) must sit back 20 feet from the front property line, 5 feet from each side yard with both sides totaling at least 15 feet, and 10 feet from the rear, under KZC 15.30.060's Density/Dimensions Table. Lot coverage tops out at 50 percent, and height is capped 25-30 feet above average building elevation.

Key details: Front yard (RS/RSX/RSA): 20 feet. Side yard: 5 ft each, 15 ft combined min. Rear yard (RS/RSX): 10 feet. Max lot coverage: 50 percent. Max height: 25-30 ft above ABE.

Building setback violations are enforced by Kirkland's Planning and Building Department under KMC Chapter 1.12, Code Enforcement. A verified encroachment triggers a notice and order and, if needed, a voluntary correction agreement; unresolved noncompliance draws a civil fine of $100 per day for days 1-15, $250 per day for days 16-30, and $500 per day after day 31, capped at $50,000 per violation under KMC 1.12.045. Paying the fine doesn't excuse the duty to remove or fix the encroachment.

The Bottom Line

Kirkland's building setbacks & zoning rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Kirkland is broadly strict or permissive.

Keep in mind that Kirkland can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.