Petaluma has special requirements for projects that add or change 500 or more square feet of landscaping on your property. The requirements are listed in the City's municipal code, 15.17.050 Landscape water use efficiency standards.
If these requirements apply to your project, you will need to submit a project plan to the City for review and approval.
Some trees are protected and require staff overview before you trim or remove them.
You should make sure you get all the permits you need before you start your project. Some projects may trigger fees are upgrades that will cost money.