Passivhaus Windows in Australia: Specifications, Standards, and What to Look For
Passivhaus windows in Australia are a growing area of interest as more architects, builders, and homeowners pursue high-performance building standards that go well beyond the minimum NatHERS requirements. The Passivhaus standard originated in Germany and has been adopted globally as the benchmark for ultra-low energy buildings. Windows are among the most technically demanding components of a Passivhaus project, and selecting the right product requires a clear understanding of what the standard requires and what products can meet it in Australian climate conditions.
What the Passivhaus Standard Requires From Windows
The Passivhaus standard is a performance-based framework that requires buildings to achieve specific targets for heating and cooling energy demand, primary energy use, and airtightness. Windows play a central role in all three areas.
The performance requirements for Passivhaus windows in Australia include the following:
- U-value of 0.80 W/m²K or below: This is the typical Passivhaus Institute requirement for window U-values in temperate climates. Achieving this requires triple glazing combined with high-performance uPVC frames. Standard double glazed aluminium windows cannot achieve this level of performance.
- Appropriate solar heat gain coefficient by orientation: Passivhaus design uses solar gains strategically. North-facing windows in Australian climate zones typically require a higher SHGC to maximise winter solar heating, while east and west-facing windows require lower values to control summer overheating.
- Airtightness at the frame level: Passivhaus buildings target whole-building air leakage of 0.6 air changes per hour at 50 pascals pressure. Windows must contribute to this by sealing tightly at the frame-to-wall junction and through multi-point locking systems that compress perimeter seals fully.
- Certified performance data: Passivhaus modelling software requires certified component data. Windows should carry WERS ratings or equivalent independent certification to provide accurate inputs for the energy model.
Why uPVC Triple Glazing Is the Standard Specification
Most Passivhaus projects specify triple glazed uPVC windows because no other combination achieves the required U-values at a practical cost. Aluminium frames, even with thermal breaks, introduce thermal bridges that are difficult to reconcile with Passivhaus requirements without additional detailing. uPVC frames with multi-chamber construction achieve inherently low frame U-values that support the overall window performance.
Passivhaus windows in Australia through Astellite use German-engineered Aluplast uPVC profiles, which were developed in Germany specifically for the European market where Passivhaus construction has been standard for decades. The profiles carry the engineering pedigree and performance characteristics needed for high-performance Australian projects.
Astellite’s High-Performance Window Range
Astellite manufactures triple and double glazed windows for high-performance projects across Melbourne using Aluplast uPVC profiles and high-performance Lightbridge glazing. The range covers all major styles including tilt and turn windows, fixed windows, awning windows, sliding windows, and custom windows.
Every window is custom manufactured to your project’s exact specifications and installed by Astellite’s own team. Astellite holds accreditation from AGWA and WERS, and all products meet Australian building and safety standards including bushfire compliance where applicable. Every installation is backed by a 10-year warranty.
Get a Free Quote Today
Astellite services homes and projects in Melbourne, Geelong, Melton, and the Mornington Peninsula. Contact us today to discuss your Passivhaus window requirements and arrange a free consultation.