How-To Guides

Understanding BASIX Water and Energy Targets in NSW

Learn how the mandatory BASIX water and energy targets impact your Sydney home build, including rainwater tanks, solar requirements, and hot water systems.

TL;DR To build a custom home in Sydney, you must pass the NSW Government's BASIX assessment. While much attention is given to the thermal comfort (insulation and glazing) section, the Water and Energy targets are equally critical. These targets legally dictate the size of your rainwater tank, the efficiency of your showerheads, the type of hot water system you can install, and the size of your solar array. Understanding these targets early ensures accurate builder quotes and prevents expensive redesigns or non-compliance issues at handover. Introduction When designing a new home or undertaking a major renovation in New South Wales, the Building Sustainability Index (BASIX) is the regulatory gatekeeper. You cannot get a Development Application (DA) or Complying Development Certificate (…