There are two areas of legislation that manage new construction in bushfire areas, the Building Regulations (Bushfire Prone Area - BPA) and the Planning Scheme (Bushfire Management Overlay - BMO).
Under the Building Regulations the Bushfire Prone Area mapping (BPA) applies to areas which are subject to, or which are likely to be subject to bushfires/grass fires.
Under the Planning Scheme the Bushfire Management Overlay (BMO) applies to land that may be significantly affected by a bushfire. The Bushfire Management Overlay triggers the need for a planning permit for certain developments.
For more detailed information regarding the above and to find out if your property is affected please visit the DELWP website.