Frequently Asked Questions Subdivision What is the difference between UNIT TITLE and FEE SIMPLE? Fire Engineering Do we require firewalls when subdividing existing large shops into multiple units or tenancies? Do we need to review the whole building when only doing building works in one unit of a large complex? Do we need sprinklers in a Boarding House? Do we need sprinklers in a Warehouse? Do we require a fire rating for a residential house where walls are less than 1 m to the boundary. I am doing alterations to an existing building. Do we need to upgrade the whole building due to Earthquake prone issues?