Indoor air quality is one of the most important parts of a healthier home. A home may look sustainable from the outside, but if the indoor air is stale, damp, polluted or poorly ventilated, it may not support the people living inside it as well as it should.
Glazing and shading are two of the most important design decisions in a sustainable home. Windows bring light, views, ventilation and connection to outside, but they can also create heat gain, heat loss, glare and comfort problems if they are not designed carefully.
Green Star Homes Performance Guide
Thermal comfort supports the performance and liveability of a Green Star Home, but it must be understood through the framework’s design, evidence and completed-home certification pathway rather than as a standalone sustainability claim.
Green Star Homes is a voluntary residential certification pathway structured for eligible volume home builders. It brings energy performance, indoor-environment considerations and climate resilience together across repeatable home designs and individual completed dwellings.
Thermal comfort is influenced by the way the home responds to heat, cold, solar exposure, air movement and changing outdoor conditions. Orientation, glazing, shading, insulation, construction systems, air leakage, ventilation and household services can all contribute to that response.
This guide focuses on how those inputs support the Green Star Homes framework. It does not replace the separate technical territory of NatHERS thermal assessment, Passive House certification or specialist Thermal Comfort Modelling.
A sustainable home in Australia is not defined by one product, appliance or rating alone. It is shaped by how the home responds to climate, how comfortable it feels, how much energy and water it uses, how healthy the indoor environment is and how well the home can adapt to future conditions.
NSW Residential Sustainability Comparison
Green Star Homes and BASIX can both influence the sustainability of a new home in New South Wales, but they serve different purposes, apply to different project structures and produce different forms of evidence and recognition.
BASIX is a New South Wales residential sustainability assessment used within the planning and development approval pathway. Where it applies, the project must complete the relevant assessment and carry the resulting certificate commitments into the design and construction documentation.
Green Star Homes is a separate voluntary certification framework administered by the Green Building Council of Australia. It is structured for eligible volume home builders delivering repeatable home designs or residential product ranges.
A NSW home may therefore require BASIX regardless of whether Green Star Homes certification is being pursued. The two pathways can be coordinated, but neither replaces the other. For full pathway guidance, visit the Green Star Homes Knowledge Hub and the BASIX assessment page.
Before lodging a Development Application or Complying Development Certificate in NSW, it is worth checking that the BASIX Certificate matches the plans, specifications and project details being submitted. BASIX is not just a form to attach at the end. It records the water, energy and thermal performance commitments that need to follow the project through approval, construction and final certification.
BASIX remains important at occupation certificate stage because the project needs to be built in accordance with the commitments shown on the BASIX Certificate. The certificate is not only a planning document. It follows the project through approval, construction and final certification.
BASIX does not stop being relevant once a Development Application or Complying Development Certificate has been lodged. For many NSW residential projects, BASIX becomes especially important again at construction certificate stage because the plans and specifications need to show how the BASIX commitments will actually be delivered.
A BASIX Certificate is valid for 3 months before it is submitted to council or an accredited certifier. This means the certificate should be lodged with the Development Application or Complying Development Certificate application within 3 months of being generated. If it is not lodged within that time, a new certificate will need to be generated and additional fees may apply.
Mixed use developments in NSW can require more than one energy or sustainability compliance pathway. If the project includes residential apartments or dwellings, BASIX will usually apply to the residential component. If the same building also includes retail, office, restaurant, commercial or other non-residential areas, those areas may require a separate NCC energy efficiency pathway such as Section J.
