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Green Star FAQs

FAQ F-00290
Can I use an alternative benchmark for pathway '19B Potable Water Benchmarks' in Green Star Performance v1.2?


When targeting the potable water credit using the 19B pathway, project teams may use a benchmark derived from the Water Intensity at the following NABERS Water Star levels in lieu of NBWeb data, under 19B Potable Water from Green Star - Performance v1.2:

  • 2 Star NABERS Water as a proxy for the average water consumption (kL/year/GLAR) for retail buildings (shopping centre) and
  • 3 Star NABERS Water as a proxy for the average water consumption (kL/year/NLA) for all other building types, where a NABERS Water Rating is available. 

Project teams must enter all the variables as required in the NABERS Water Reverse calculator to establish the benchmark. This benchmark shall be entered into the cell 'Please enter Mean Consumption Value based on outputs from '', in the 19B Potable Water Industry Benchmark calculator. 

This approach is approved for projects certifying under Green Star Performance v1.2 only.  Projects registered under Green Star Performance v2 must use the approach as outlined in the rating tool. 

Documentation Requirements:

Please provide the following in your submission:

  • For each asset please provide a NABERS Reverse Calculator with building data inputs reflecting the latest performance period, and benchmark extracted at the relevant NABERS level as per response. These building data inputs should be justified in the submission.
  • All other documentation as per the submission guidelines
  • A copy of this FAQ

Rating Tools

This FAQ is related to the following Rating Tools, Categories or Credits:

  • Green Star - Performance v1.2 / Water / 19 Potable Water
  • Green Star - Performance 1.2.0 / Water / 19 Potable Water


These FAQs are:

  • provided as additional technical assistance for Green Star users.
  • optional and free to use on Green Star projects.

When used on Green Star projects, make sure to:
  • state the FAQ number on the Submission Template.
  • click on "Download" to save the FAQ.
  • include the PDF in the submission.

The GBCA reserves the right to add or remove FAQ at our discretion.

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