Frequently Asked Questions Subdivision What is the difference between UNIT TITLE and FEE SIMPLE? Fire Engineering Do you require firewalls when subdividing existing large shops in to multiple units or tenancies? Do we need to review the whole building when we are only doing building works in one of the units that is a small part of a large complex? Do we need sprinklers in boarding house? Do we need sprinklers in warehouses? Residential house walls less than 1 m to the boundary. Do we require a fire rating? I am doing some alteration to existing building. Do we need to upgrade the whole building due to Earthquake prone issues?