Auburn's Sign Regulations: The Rules That Matter

Every city handles sign regulations a little differently. In Auburn, Washington, there are 4 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.

Freeway-Facing Signs

Auburn bans billboards outright citywide: the large off-premises advertising signs typically aimed at freeway traffic cannot be erected or placed anywhere in the city under the sign code's list of prohibited signs.

Key details: Billboards: Prohibited citywide, ACC 18.56.030(I)(13). Billboard face size referenced in code: 12-14 ft high, 24-48 ft wide. Narrow off-premises allowance: C-2 zone only, ACC 18.56.040(E)(5). Off-premises sign max height (C-2): 20 feet.

Erecting a billboard anywhere in Auburn, or any large freeway-oriented off-premises sign meeting the billboard definition in ACC 18.56.020(C), violates the prohibition in ACC 18.56.030(I)(13); the building official can deny the permit application outright and pursue removal through the city's code compliance process.

Compared to other cities, Auburn takes a harder line on freeway-facing signs. The enforcement and penalty structure reflects that.

Window Signs

Auburn caps any window sign meant to be seen from the street at half the window's area, and treats permanent window signage as a wall sign subject to the wall sign area limits for the property's zoning district.

Key details: Temporary window sign cap: 50% of window area. Permit for compliant window signs: None required. Permanent window sign treatment: Counted as wall sign. Governing section: ACC 18.56.030(B)(3).

A window display exceeding 50 percent of the window's area, or a permanent window sign that pushes a building's total wall signage over its district's square-footage allowance, is a code violation handled through the building official's sign permit and code compliance process under Chapter 18.56 ACC.

Digital Billboards

Auburn allows electronic changing message center signs only in specific commercial and industrial zones, one per frontage, capped at 8,000 nits by day and 500 nits at night, with a minimum 1.5-second dwell time between message changes.

Key details: Allowed zones: I, P-1, C-1, C-2, DUC, M-1, M-2. Signs per property: One per street frontage. Daytime brightness cap: 8,000 nits max. Nighttime brightness cap: 500 nits max. Minimum display duration: 1.5 seconds per change.

Operating a changing message center outside the permitted zones, exceeding one per frontage, running brightness above the 8,000/500-nit day/night caps, or displaying off-premises advertising violates ACC 18.56.030(F) and is enforced through the building official's sign permit and code compliance process.

This is not one of those rules that cities tend to ignore. Auburn actively enforces its digital billboards requirements.

Political Signs

Auburn exempts temporary political signs from its sign code entirely: any temporary sign limited exclusively to noncommercial speech, the category political and campaign signs fall into, is not regulated under the size, permit or duration rules that govern commercial signage.

Key details: Governing exemption: ACC 18.56.030(H)(11). Size/permit limits: None for noncommercial signs. Right-of-way placement: Still restricted, ACC 18.56.030(I)(7). Utility pole/tree attachment: Still prohibited, ACC 18.56.030(I)(10).

A sign claiming the noncommercial exemption while carrying commercial content loses the H(11) protection and is regulated as an ordinary temporary sign under ACC 18.56.030(B); political signs placed on public right-of-way, on utility poles, or that obstruct traffic sight lines remain enforceable violations under ACC 18.56.030(I).

Auburn is more permissive than most cities when it comes to political signs. That said, there are still limits.

The Bottom Line

Auburn is tougher than many cities when it comes to sign regulations. Out of the 4 rules covered here, 2 are rated strict. If you are a homeowner, renter, or business owner in Auburn, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

Keep in mind that Auburn 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.