San Mateo's Tree Protection: The Rules That Matter

Every city handles tree protection a little differently. In San Mateo, California, there are 3 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Heritage & Protected Trees

San Mateo has a Protected Trees ordinance (Chapter 13.40) covering Heritage Trees, Street Trees, and trees designated through planning. Heritage Trees are oaks 10 inches+ diameter and other species 15 inches+ at 54 inches above grade. Damage or removal without approval is prohibited.

Key details: Heritage Oak: 10 in+ diameter at 54 in above grade. Other Species: 15 in+ diameter at 54 in. Major Pruning: Permit for >25% of crown. Protection Zone: 10x trunk diameter from trunk. Code Reference: SMMC Chapter 13.40.

Damaging or removing a heritage tree without approval carries significant penalties. The city may require replacement planting at assessed value using the Guide for Plant Appraisal. Violations are subject to enforcement proceedings.

Compared to other cities, San Mateo takes a harder line on heritage & protected trees. The enforcement and penalty structure reflects that.

Tree Replacement Requirements

When a protected tree is removed in San Mateo, replacement is required under the Protected Trees ordinance (Chapter 13.40). Replacement value is assessed using the Guide for Plant Appraisal. Street tree replacement is managed by the city. Development projects must preserve or replace trees.

Key details: Protected Trees: Replacement required under Ch. 13.40. Valuation: Guide for Plant Appraisal. Street Trees: City Public Works replaces. Development: Tree inventory and preservation plan. Public Works: 650-522-7300.

Removing protected trees without approval and replacement constitutes a violation of Chapter 13.40. The city may require full replacement value compensation.

This is one of the stricter rules in San Mateo's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Tree Removal Permits

San Mateo requires permits for removing protected trees under Chapter 13.40. Heritage Trees (oaks 10+in, others 15+in diameter) and Street Trees cannot be removed without city approval. Standard private trees below heritage thresholds do not require removal permits.

Key details: Heritage Tree Permit: Required for protected trees. Oak Threshold: 10 in diameter at 54 in above grade. Other Species: 15 in diameter at 54 in. Street Trees: Public Works approval required. Non-Heritage: No permit needed if below thresholds.

Removing a protected tree without approval is a serious violation. Penalties include required replacement at assessed value and potential fines.

This is not one of those rules that cities tend to ignore. San Mateo actively enforces its tree removal permits requirements.

The Bottom Line

San Mateo is tougher than many cities when it comes to tree protection. Out of the 3 rules covered here, 3 are rated strict. If you are a homeowner, renter, or business owner in San Mateo, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

Keep in mind that San Mateo can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.