NatHERS Compliant Windows: What They Are and How to Choose the Right Product
NatHERS compliant windows are a requirement for new residential builds across Australia and an important consideration for any significant renovation or extension. The Nationwide House Energy Rating Scheme sets the thermal performance benchmark that homes must meet, and windows play a direct role in whether a project achieves compliance. This guide explains what NatHERS compliance means for windows specifically, what products qualify, and how Astellite helps homeowners and builders meet the standard.
What NatHERS Compliance Means for Windows
NatHERS rates the thermal performance of a home on a scale from zero to ten stars. The 2022 National Construction Code requires new residential buildings to achieve a minimum 7 star NatHERS rating. Windows contribute to this rating through three key performance metrics.
- Thermal transmittance (U-value): This measures how quickly heat passes through the window from the warmer side to the cooler side. A lower U-value means better insulation. NatHERS compliant windows need to achieve U-values that support the overall home rating, and this generally requires double or triple glazing combined with low-conductivity frames.
- Solar heat gain coefficient (SHGC): This measures how much solar radiation passes through the glass into the home. The right SHGC depends on climate zone and window orientation. In Melbourne, windows on the north face benefit from higher SHGC to capture winter sun, while west-facing windows benefit from lower SHGC to limit afternoon heat gain in summer.
- Air infiltration: Poorly sealed windows allow significant air exchange between indoors and outdoors, which adds to heating and cooling loads. Multi-point locking systems that compress seals evenly are important for minimising infiltration.
How Products Are Assessed for NatHERS
The Window Energy Rating Scheme provides independently tested and verified ratings for window products that are used as inputs in NatHERS assessments. Products with WERS ratings give assessors the data they need to accurately model a home’s thermal performance. Astellite holds WERS accreditation across its product range, which means the performance of its windows can be directly inputted into NatHERS modelling software.
NatHERS compliant windows from Astellite use German-engineered Aluplast uPVC profiles, which feature five-chamber construction for low thermal conductivity through the frame. Combined with high-performance Lightbridge double glazing and precise installation, the products achieve the performance levels required to support 7 star NatHERS ratings across a range of climate zones and building configurations.
The Product Range
Every Astellite window is custom manufactured to your home’s exact dimensions. The range covers all major window styles for residential applications:
- Tilt and turn windows with excellent sealing and flexible ventilation.
- Awning windows for rooms that need airflow in all conditions.
- Sliding windows for modern layouts.
- Bifold windows for wide openings to outdoor spaces.
- Fixed windows for maximum insulation in permanently sealed areas.
- Bay windows for additional light and views.
- Corner windows for contemporary designs.
- Custom windows for non-standard openings.
Triple glazing is available for applications where maximum thermal performance is required. All products are available in a wide range of UV-resistant frame colours and finishes.
Get a Free Quote Today
Astellite services homes in Melbourne, Geelong, Melton, and the Mornington Peninsula with free, no-obligation quotes. Every installation is backed by a 10-year warranty and the team holds accreditation from both AGWA and WERS. Contact us today to arrange your measure and get started on your compliant window specification.