BASIX Assessments

We conduct BASIX Assessments to ensure your units are BASIX-compliant, help you reduce your carbon footprint, cut down on utility bills and contribute to achieving a sustainable future.

Our experts will ensure that your project is properly assessed, so that you can gain the certification you need to begin.

Our Service Coverage

BASIX assessment is applicable to Wollongong, Sydney and the rest of New South Wales. BASIX assessment is mandatory for all kinds of residential dwellings and developments.

To help you fulfil all BASIX requirements, we provide assessment services which cover:

  • New single-dwelling homes
  • Dual occupancies
  • Multi-dwelling units and apartments
  • Alterations or additions (renovation) with an estimated minimum value of $50,000
  • Swimming pool or spa installations with a capacity of at least 40,000 litres
  • Australian Building Sustainability Association (ABSA)/National Home Energy Rating Scheme (NaTHERS) energy rating certification
  • Sustainability advice and recommendations

BASIX/ NatHERS – All You Need to Know

Introduced way back in 2004, the objective behind the Building Sustainability Index (BASIX) is to bring about the reduction of water consumption and greenhouse gas emissions in New South Wales. The scheme was implemented in Australia under the Environmental Planning and Assessment Act.

BASIX has set sustainability goals concerning water and energy, and minimum performance requirements regarding each proposed development’s capacity to provide thermal comfort to residents.

BASIX encompasses all types of residential dwellings and is a critical requirement in the development application process in New South Wales. Without a BASIX assessment, building and development proposals cannot be lodged with a council. Therefore, all residential building owners must submit their proposed development design for BASIX assessment.

When your design is established to be BASIX-compliant, a BASIX certificate in PDF format is generated online through the website of the New South Wales Government’s Department of Planning and Infrastructure. The BASIX certificate is attached and submitted during the development application (DA) stage for project approval by the relevant council. It is also a requirement for the issuance of a construction certificate (CC) and final inspection.

However, if the results of the BASIX assessment show that your proposed design is not BASIX-compliant, whether due to conflicts with heritage controls or because the new technology included with the design is not acceptable to BASIX, you may request an alternative evaluation.

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BASIX Targets and Required Project Details

For single dwellings in coastal New South Wales, BASIX targets typically concern the following:

  • The reduction of potable water use by 40 percent
  • The reduction of greenhouse gas emissions by 50 percent

Although the benchmark is New South Wales, these targets are adjusted to address regional climate variations. These can be changed over time to fulfil each state’s water and greenhouse gas savings goals.

The variability of targets based on specific local conditions (e.g., soil type, rainfall, evaporation rates) and residential types (e.g. high-rise apartments, single detached houses, etc.) guarantees the equitable implementation of BASIX standards of compliance across New South Wales.

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The site details page of BASIX requires assessment applicants to enter the following information:

Single dwelling developments

  • Site area
  • Area of the roofing structure
  • Total number of storeys or floors
  • Floor area of the conditioned section of the development
  • Floor area of the unconditioned section of the development
  • Area of the garage
  • Area of the mezzanine section
  • Data on whether a swimming pool and or outdoor spa is to be installed. Information on indoor spas, including spa baths, is not needed.

Multi dwelling developments

  • Site area
  • Total area of the roof (applies to all buildings)
  • Area of the non-residential floor
  • Total number of car spaces for residents
  • Total number of non-residential car parking spaces
  • Specific details of common areas to be included in the common areas page. However, BASIX only requires details for underground or covered communal car park areas. These include underground communal carparks and undercover communal carports. Private garage/carports that are located above-ground and open air carparks are excluded.


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