King County, WA Zoning Overlays & Bonuses: Downtown Design Guide (2026)
Key Facts
- Applies to
- North Highline / White Center only
- Zones covered
- CB, NB, RB, O, R-12 through R-48
- Exempt
- small residential, affordable housing, mobile vendors
- Not covered
- Seattle, Burien, other cities
Summary
Unincorporated King County has no countywide downtown design code: only the North Highline subarea (the White Center activity center) has adopted urban design standards under K.C.C. 21A.09.070, governing site layout, streetscape, and building character for new commercial and multifamily development there.
The North Highline urban design standards are hereby established. ... shall apply to: 1. All new buildings or substantial improvements to developments in the CB, NB, RB, O, R-12, R-18, R-24, and R-48 zones; and 2. Modification to any existing building that affects its exterior appearance in the White Center unincorporated activity center land use designation, except for single detached dwelling units.
Full Breakdown
K.C.C. 21A.09.070 establishes the North Highline urban design standards to implement the North Highline community service area subarea plan's vision for site design, building design, urban form, and neighborhood character. The linked standards (K.C.C. 21A.09.080-.150: street frontage, parking access, lighting, facade modulation, and building scale) apply to all new buildings or substantial improvements in the CB, NB, RB, O, R-12, R-18, R-24, and R-48 zones, plus exterior remodels within the White Center unincorporated activity center. Exempt: small residential projects under ten units, developments with 20%+ units affordable at or below 70% AMI, and mobile vendors.
Violations & Fines
Design review is a permit condition, not a fine schedule: the county's permitting department can withhold building or site development permit approval until plans meet the North Highline standards, and unpermitted construction is subject to King County code enforcement.
Frequently Asked Questions
Does this apply to downtown Seattle?
Which projects trigger the standards?
Sources & Official References
Other rules in King County
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