San Marcos, CA Landscaping Rules: Tree Removal & Heritage Trees (2026)

The City of San Marcos has tree protection provisions in its municipal code that require permits before removing certain trees. Coast live oaks (Quercus agrifolia) and Engelmann oaks (Quercus engelmannii) are protected species throughout San Diego County and require permits before removal regardless of size. Heritage trees — generally defined as trees with a trunk diameter of 24 inches or greater measured at breast height (4.5 feet above grade) — are also protected. Permit applications require a certified arborist's report documenting the tree's condition, species, size, and the reason for removal. Valid reasons include the tree being dead, diseased beyond treatment, or presenting an imminent hazard. Development projects must submit a tree survey identifying all protected trees and a preservation plan. Trees removed with a permit typically require replacement planting at a ratio of 2:1 or 3:1 depending on the species and size. In-lieu fees may be accepted when on-site replacement is not feasible. The city's environmental review process (CEQA) may also require additional tree preservation measures for development projects. The Planning Division processes tree removal permits and can be contacted at (760) 744-1050.