Often, yes. Hazelbrook sits within the Blue Mountains local government area, where many trees are protected and the bushland setting brings extra rules. A council permit may be required before any large tree is removed, so it is worth checking before anyone picks up a chainsaw.
Bushfire zone considerations can also apply. Much of Hazelbrook is mapped as bushfire-prone land, and clearing rules for properties in these areas differ from those elsewhere in Sydney. The rules depend on the tree species, its size, its location on the block and the zoning of the property.
Where approval is required, the arborists help you understand what Council will want to see and help prepare the supporting information. Work starts only once the approvals side is clear.
If a tree is an immediate danger after a storm, a separate emergency process may apply. The team can explain how that works at the free tree inspection.