Lake Oswego Tree Code Update
Lake Oswego, OR · 2026
Client: City of Lake Oswego
Location: Lake Oswego, OR
Year: 2026
CP Role: Lead consultant
Practice Area: Environment + Sustainability
Team: Sachi Arakawa, Principal-in-Charge; Sara Goldstein, Project Manager; Mary Phillips, Code Review; Pauline Ruegg
The Challenge
Lake Oswego needed to turn its new Urban and Community Forestry Plan into clear tree regulations. The update had to balance tree preservation with community character, clear and objective standards, and fewer barriers to housing on constrained sites, and comply with state law.
Our Approach
We managed the project and ran engagement that made a complex, technical code understandable to residents and elected officials. We organized and facilitated a Tree Task Force advisory group and stakeholder focus groups, tabled at community events, and produced plain-language materials. We also audited the existing code and drafted the amendments to the Tree Code and Community Development Code.
Outcome
The City Council adopted the amendments in July 2026, and they took effect on October 1, 2026. The new code adds a clear and objective track for new homes and lot creation, which requires keeping at least 45 percent of trees over 15 inches in diameter or paying a fee.