Santa Monica Tree Trimming Rules (2026): What You Need to Know

SMMC Chapter 7.40 establishes Santa Monica's comprehensive tree protection ordinance, which is notably more protective than most California cities. The ordinance designates trees as a significant community resource essential for air quality, shade, aesthetics, and property values. Any tree on public or private property with a trunk diameter of 4 inches or more measured at 4.5 feet above grade (diameter at breast height, or DBH) is a protected tree and requires a City permit before removal.

The City maintains a registry of landmark and specimen trees that receive the highest level of protection and generally may not be removed except in cases of imminent hazard. For street trees (those in the public right-of-way), any trimming, pruning, or removal requires a permit from the Urban Forest Division. Work on street trees must be performed by a licensed, insured arborist approved by the City. Topping of street trees is prohibited. Property owners adjacent to street trees are responsible for watering and basic maintenance but may not trim without authorization. When tree removal is permitted, the City typically requires replacement at a ratio of 2:1 (two new trees planted for each tree removed) and may require the planting of specimen-size trees. The City's Urban Forest Master Plan guides planting and preservation citywide.