In the City of San Mateo, removing a protected tree on private property requires an approved permit. So does Major Pruning of one. If you’re planning tree work on a San Mateo property, the first question is whether the tree is protected.
These are San Mateo’s rules. Other Peninsula cities have their own, so check the code for the city where your property sits.
Which trees are protected in San Mateo
The rules are in Chapter 13.40 of the San Mateo Municipal Code. The City of San Mateo’s protected tree page lists three groups. Heritage Trees are protected. So are oak trees with a trunk diameter of 10 inches or more. Any other species is protected at 15 inches or more.
Oaks get a lower limit. A modest oak can be protected when a much larger tree of another kind is not. Trees of 6 inches or more can also be protected when a Planning Application designated them that way.
The city publishes a guide to measuring trunk diameter. Measure before you decide a tree falls under the line.
What the permit covers
The permit applies to removal of a protected tree and to Major Pruning. You apply through the city’s Private Property Protected Tree Permit Application or its Customer Service portal.
The city arborist offers code consultation by appointment, at arborist@cityofsanmateo.org or (650) 522-7172. The city’s page lists no fees, penalties or processing times, so confirm those with the city.
When the tree is part of a construction project
If a protected tree is part of a construction project, the removal application is reviewed by the Community Development Department. That review happens at the same time as the development permit application.
Some projects also need a Tree Protection Plan. It applies when construction encroaches on the Tree Protection Zone. That zone is a radius equal to 10 times the diameter of the trunk. An ISA Certified Arborist prepares the plan, and it has to be submitted before any building permit is issued.
Frequently asked questions
How do I know whether my tree is protected?
It depends on the species and the trunk diameter. Oaks are protected at 10 inches or more and other species at 15 inches or more. Heritage Trees are protected as well. The city arborist can answer code questions by appointment.
Do I need a permit to prune a protected tree?
The city requires one for Major Pruning. Ask the city arborist whether your planned work counts as Major Pruning.
Where do I apply?
Use the city’s Private Property Protected Tree Permit Application or its Customer Service portal.
Settle the tree question before the plans
Protected status depends on species and trunk diameter, so measure the trunk before you schedule tree work or draw up plans. The city arborist handles code questions by appointment.
If you’re preparing a San Mateo home for sale and have a question about a tree on the property, I’m happy to walk it with you.
About the Author:
Mark Tauber has spent more than two decades selling homes on the SF Peninsula. Reach him at marktauber.com.
