Outdoor Lighting in Issaquah, WA (2026)
2 verified outdoor lighting rules for Issaquah, Washington, sourced directly from the municipal code and official government pages.
Verified from official government sources
Dark Sky Rules
Issaquah defines dark sky hours as 10:00 p.m. to 6:00 a.m., or 30 minutes after a business closes to 30 minutes before it opens, whichever provides more dark sky. During those hours, total outdoor lighting on covered nonresidential and multifamily sites must be reduced by at least 30 percent or extinguished.
Issaquah Dark Sky Hours and Lighting Reduction Rules
Some RestrictionsIssaquah Land Use Code § 18.610.060(E)(1)
Dark Sky Hours Between 10:00 p.m. and 6:00 a.m. or 30 minutes after close of a business or entity with outdoor lighting to 30 minutes before opening of the business, whichever provides more dark sky. Dark Sky Lighting Reduction Levels Total outdoor lighting reduced by at least 30 percent or extinguished. This includes low voltage landscape lighting. Total outdoor lighting must be uniformly redu...
Light Trespass & Shielding
In Issaquah, residential outdoor lighting on properties with 10 or fewer dwelling units and no outdoor common area cannot be aimed onto adjacent properties, including landscape lighting. Luminaires must be fully shielded, flood lights must be aimed so direct glare is not visible next door, and no luminaire can sit higher than 15 feet above grade.
Issaquah Residential Light Trespass and Shielding Rules
Some RestrictionsIssaquah Land Use Code § 18.610.070(B)
A. Applicability. ... All outdoor lighting must comply with this section if a property or project is a residential use and contains 10 or less dwelling units and does not have an outdoor common area. B. General Requirements and Prohibitions. 1. Outdoor lighting may not be aimed onto adjacent properties including low voltage and line voltage landscape lighting. In addition, shielded directional ...
Looking for King County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Issaquah city rules.
Outdoor Lighting in King County →