Auburn, WA Home Business: Signage Rules (2026)
Key Facts
- Sign count allowed
- One sign maximum
- Maximum sign size
- 18 inches by 24 inches
- Illumination
- Not allowed
- Mounting
- Must attach to a building
- Zone exception
- Commercial/industrial zones follow Ch. 18.56 ACC
Summary
Auburn limits a home occupation to a single nonilluminated sign no larger than 18 by 24 inches under ACC 18.60.020(G), unless the home occupation sits in a commercial or industrial zone, where regular zoning sign rules apply instead.
G. Signage. Only one sign is permitted, not to exceed 18 inches by 24 inches in area, nonilluminated, and attached to a building, except that home occupations in commercial or industrial zones may have signs consistent with the applicable zoning district;
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 7023, passed July 6, 2026).
Full Breakdown
020(G) is the specific signage clause inside Auburn's 11-part home occupation requirements. It reads that only one sign is permitted for a home occupation, capped at 18 inches by 24 inches in area, must be nonilluminated, and must be attached to a building rather than freestanding. 56 ACC, the city's general sign code. 040, which requires planning director review and can be escalated to the hearing examiner if public comment raises controversy. 010 that the dwelling's residential character not be altered by colors, materials, lighting, or signs associated with the business.
Violations & Fines
A home occupation sign that exceeds 18 by 24 inches, is illuminated, or is not attached to the building violates ACC 18.60.020(G) and puts the operation out of compliance with the 11-requirement standard, exposing it to code enforcement action or a requirement to apply for a special home occupation permit under ACC 18.60.040 if it can still meet at least nine of the 11 total requirements.
Frequently Asked Questions
How big a sign can a home business have in Auburn?
Can a home business sign be lit up at night in Auburn?
Does the 18x24-inch sign limit apply to every home business in Auburn?
Sources & Official References
Other rules in Auburn
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Signage Rules in Nearby Cities
How other cities in King County handle signage rules.