Property Glossary
Passivhaus is an internationally recognised building standard for extremely low energy buildings. In Australia, adoption is growing — and in Queensland's subtropical climate, the principles are adapted to focus on heat exclusion and humidity management rather than the cold-climate heat retention of the European original.
Passivhaus (German for Passive House) is a rigorous international building performance standard originally developed in Germany in the early 1990s and now applied globally. A certified Passivhaus building achieves exceptional levels of thermal comfort and energy efficiency through the application of five core design principles, applied together as a system rather than individually.
The entire thermal envelope — walls, roof, floor — is heavily insulated to minimise heat transfer in or out. Insulation levels far exceed standard Australian building code requirements.
The building envelope is constructed to minimise uncontrolled air infiltration — the random movement of air through gaps, joints and penetrations. Tested to a maximum of 0.6 air changes per hour at 50 pascals pressure (n50 ≤ 0.6 h⁻¹).
Triple or high-specification double glazing with thermally broken frames minimises heat transfer through the glazed areas. In subtropical climates, Solar Heat Gain Coefficient (SHGC) is as important as thermal insulation value.
A continuous, controlled fresh air supply system that recovers energy (heat or both heat and moisture) from the outgoing stale air. In subtropical climates, an Energy Recovery Ventilator (ERV) — which also transfers moisture — is generally more appropriate than a Heat Recovery Ventilator (HRV).
Structural elements that penetrate the insulated envelope — metal fasteners, concrete slabs, window frames — conduct heat in or out, reducing the effectiveness of the insulation. Passivhaus design systematically eliminates or minimises these thermal bridges.
A certified Passivhaus must achieve: heating and cooling demand ≤ 15 kWh/m² per year, primary energy demand ≤ 60 kWh/m² per year (or ≤ 120 kWh/m² per year for Passivhaus Plus and Premium with on-site generation), and airtightness n50 ≤ 0.6 h⁻¹ verified by blower door test.
The Passivhaus standard was developed in central Europe for cold climates where the primary challenge is retaining heat through long winters. In Australia's subtropical and tropical climates, the design priorities are fundamentally different — the goal is heat exclusion and humidity management, not heat retention.
In Climate Zone 2 (Noosa's classification), a Passivhaus building must prioritise shading and solar control to exclude solar heat gain — particularly on east and west-facing facades. High performance glazing with low SHGC values is preferred on non-north-facing windows. Airtight construction combined with energy recovery ventilation controls indoor humidity — critical in a climate where outdoor humidity frequently exceeds 70–80% in summer. Deep eaves and external shading remain important passive design elements even in a Passivhaus — the mechanical ventilation system manages air quality and humidity but cannot replace the thermal benefit of well-designed shading.
EnerPHit is the Passivhaus standard for renovation of existing buildings — with slightly relaxed targets to reflect the constraints of working with existing structure. For buyers considering purchasing an older Noosa home and renovating to near-Passivhaus performance, EnerPHit provides a roadmap and certification pathway.
Many quality new builds in Australia are designed with Passivhaus principles in mind without pursuing full certification — achieving near-Passivhaus performance at lower administrative cost. For buyers commissioning a new build in Noosa, specifying Passivhaus principles (even without formal certification) produces a building that will perform significantly better than standard code compliance.
Certified Passivhaus buildings are rare in the Noosa market — and indeed across Australia generally. The standard is well-established in Europe but Australian adoption has been growing from a small base over the past decade. This is changing as builder familiarity with the standard increases, as the cost premium narrows and as energy costs continue to rise.
Noosa's design culture — which has always placed emphasis on indoor-outdoor living, natural ventilation and connection to landscape — sits in interesting tension with the airtight, mechanically ventilated model of a strict Passivhaus. Many Noosa architects and builders are finding ways to integrate Passivhaus principles with the open, verandah-connected aesthetic of quality Noosa residential design — using the ERV system to manage humidity while still designing for generous cross-ventilation when conditions allow.
For buyers commissioning a new build in Noosa, the following approach is gaining traction: design the building envelope to Passivhaus specification — insulation, airtightness, thermal bridge-free construction, high performance glazing — while designing the living spaces for the outdoor-connected lifestyle that Noosa buyers value. The result is a building that performs exceptionally well in energy terms while feeling genuinely Noosa in character.
If you are considering commissioning a Passivhaus or near-Passivhaus home in Noosa, engage a designer familiar with both the Passivhaus standard and subtropical design from the very start of the project. The performance outcomes are determined by decisions made in the early design stages — not by what is specified later.
Passivhaus design in a subtropical climate requires specific expertise in both the standard and the local conditions. Ross can connect buyers and owner-builders with designers and builders experienced in high performance subtropical construction.