Snohomish County Revises Accessory Dwelling Unit Regulations My Everett News

The Snohomish County Council took a significant step in addressing the local housing crisis by passing Ordinance 25-014 on March 20, 2025. This ordinance revises Accessory Dwelling Unit (ADU) regulations, which previously restricted ADUs to single-family residences. The new law allows duplexes and attached single-family homes in urban zones to also include ADUs, thereby expanding housing options. Additionally, it removes specific architectural standards associated with ADUs and introduces incentives to stimulate their development in urban areas. Council Vice Chair Megan Dunn, who sponsored the ordinance, expressed pride in initiating measures that respond to community needs and promote affordable housing.

The ordinance is designed to implement state law and encourage sustainable land use practices while protecting open spaces. Public hearings and recommendations from the Snohomish County Planning Commission played a crucial role in shaping the ordinance, which included amendments on setbacks and lot coverage. The passage of this ordinance marks a proactive approach to enhancing housing availability and affordability in Snohomish County.