How Seattle Handles Outdoor Lighting: A Practical Guide

Seattle maintains 177 local ordinances across all categories, and 2 of those deal specifically with outdoor lighting. Here is a breakdown of what the city actually requires, what is prohibited, and where Seattle falls on the strict-to-permissive spectrum compared to other cities.

Billboard Lighting

SMC 23.55.014(E)(3) caps how brightly Seattle billboards and other off-premises signs can be lit: incandescent illumination is limited to 1.25 watts per square foot of sign area, fluorescent or other illumination to 1 watt per square foot, and signs that use lights as part of the advertising message itself, chasing displays or message boards, are banned outright.

Key details: Governing section: SMC 23.55.014(E)(3). Incandescent light cap: 1.25 watts per sq ft of sign area. Fluorescent/other light cap: 1 watt per sq ft of sign area. Chasing/message-board lights: prohibited outright. Unregistered sign face penalty: $5,000 per sign face annually.

An off-premises sign lit beyond the incandescent or fluorescent wattage cap, or using prohibited chasing or message-board lighting, is a Title 23 violation subject to a notice of violation and the standard civil penalty under SMC 23.90.018.A: up to $150 per day for the first ten days of noncompliance, then up to $500 per day until the lighting is brought into compliance. Separately, maintaining any unregistered off-premises sign face carries an explicit annual civil penalty of $5,000 per sign face under subsection F, regardless of whether the sign is illuminated.

Light Trespass & Shielding

Seattle's Land Use Code requires exterior lighting on commercially zoned lots to be shielded and pointed away from neighboring properties. SMC 23.47A.022 also caps light poles at 30 feet (40 feet in taller zones with an energy-efficiency offset), requires parking-garage lighting to be shielded against nighttime glare, and forces glare screening around any driveway or lot serving more than two vehicles.

Key details: Exterior lighting duty: Shielded and directed away from adjacent uses. Vehicle-light screening trigger: Driveways/lots with more than 2 vehicles. Screening height: 5-6 ft fence, wall, hedge or berm. Standard light pole height cap: 30 ft (40 ft with efficient fixture). Athletic field light poles: Up to 100 ft with Director approval.

Unshielded lighting or missing vehicle-light screening is a Title 23 violation under SMC 23.90.002, enforced by SDCI's Director under SMC 23.90.004. SDCI investigates complaints, issues a notice of violation, and sets a compliance deadline under SMC 23.90.006, typically requiring the fixture to be reshielded, redirected or the screening installed. SMC 23.90.020 reserves an alternative criminal penalty of up to $5,000 per occurrence for willful or bad-faith noncompliance.

The Bottom Line

Seattle's outdoor lighting 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 Seattle is broadly strict or permissive.

This guide is based on Seattle's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.