Any new structure or an addition to an existing structure needs to meet the set back requirements of the planning department. Set backs are obtained through the planning department and are often parcel sensitive. Set backs on one particular parcel or area may not be the same on another.
There may also be a PUE (Public Utility Easement) on your property that will have requirements for building.
Location of easements can be obtained through Technical Resources. Planning and Technical Resources are located at:
827 7th Street RM. 102, 2nd floor
Sacramento Ca, 95814