In July 2004 the NSW Government introduced the Building Sustainability Index (BASIX) in the Sydney Metropolitan Local Government Areas (LGA), this was then expanded to all of NSW in July 2005.

The BASIX Certificate has been designed to ensure that all NSW dwellings being new built/developed or renovated, meet a level of sustainability by reducing their greenhouse gas emissions and water usage levels.

This index enables the state of NSW to meet its sustainability targets and enable our homes to reduce their carbon footprint and benefit from other environmentally friendly energy sources well into the future.

A BASIX Certificate is required for:

  • Every application of a new dwelling submitted to Council or a Principal Certifying Authority.
  • Every pool or spa regardless of its size when included with a new dwelling application submission.
  • Renovations and extensions with a total cost of works greater than $50,000.
  • An alteration or addition of a new swimming pool or spa installations with a total volume of 40,000 litres or greater.

While completing a BASIX Certificate, some of the items taken inconsideration are:

  • Hot Water systems (e.g. gas, solar, electric)
  • Insulation types (e.g. reflective, bulk)
  • Over Shadowing (e.g. eaves, pergolas)
  • Building materials (e.g. timber, brick)
  • Heating & Cooling (e.g. fans, air conditioner, heater)
  • Size of roof for rainwater collection
  • Rainwater Tank size
  • Lighting (e.g. LED)
  • Ventilation
  • Windows (e.g. frame type, size, glazing)
  • Building orientation