Thermal Assessment(NatHERS)

Nationwide House Energy Rating Scheme (NatHERS) provides a framework that allows computer software tools to rate the potential efficiency of Australian homes.
A Thermal Performance Assessment is undertaken by qualified assessors using this sophisticated and accredited 2nd Generation software (AccuRate Sustainability V2.3.3.13 SP3). We will calculate the heating and cooling loads for your new home and an overall rating. If your home does not meet the minimum annual energy allowance, we will advise you as to ways you could improve or maximise the thermal efficiency of your home along with cost estimates. We will always try and provide various economical options without impacting the overall design of your house.
A minimum of 6 stars must be obtained in VIC; WA; QLD; SA; TAS; ACT & 5 stars in the NT.

New homes in NSW must obtain a minimum heating and cooling load based on the Building Sustainability Index (BASIX). See further information under the “BASIX” section of this website.

When conducting the thermal assessment, we will consider:


  • Layout of the home
  • Construction materials used
  • Local climate zone
  • Orientation of the home

The entire process can be done via email, making it quick and carefree for you!

If your question was not answered above, please email us at and we will gladly respond promptly with an answer

All residential projects (class 1, 2, 4 & 10a):


  • Single dwellings
  • Attached dwellings
  • Multiple dwellings (eg. Unit blocks, apartments)

We are accredited to produce and supply:


  • Thermal Performance Assessments compliant with the BCA requirements. Also referred to as Home Energy Ratings (HERS).
  • BASIX Certificate: A BASIX certificate is applicable in NSW and is required for all residential developments, alterations or additions valued at more than $50,000

What You Receive :

Thermal Performance Assessment:

  • NatHERS Energy Rating Certificate (which must be included with the DA)
  • Stamped set of assessed building plans.
NSW Only (BASIX) :

  • BASIX Certificate (in addition to the above 2 documents)

Next Steps : Email your specifications and a copy of your house plans in pdf to enquiries@sustainablethermalsolutions.com.au . A checklist is provided to guide you as to the necessary information required for the assessment. Please complete this checklist and email with your plans. You will be promptly contacted with a quote. (NB: The price is determined on a project by project basis and will be based on design complexity, house size and number of dwellings).

NatHERS Energy Assessment checklist (NB: please also submit a ‘BASIX Checklist for new dwellings’ if in NSW – see ”BASIX Certificate” tab)