In the world of residential architecture, sustainability is no longer a passive pursuit - it’s an active choice. Passive House design is gaining ground in Australia, where innovative brands like Paarhammer, iSwirl, BINQ, Fisher & Paykel, and Bondor Metecno are leading the charge.

Passive House is reshaping Australian homes, delivering both style and substance for a greener architecture and future.

The Passive House standard is a rigorous, voluntary standard for energy-efficient buildings that prioritises comfort, health, and minimal energy use.

Originating in Germany in the late 1980s, the principles are based on five key elements: a high-quality insulation, a thermal bridge-free design, an airtight construction, a mechanical ventilation with heat recovery and a high-performance windows and doors.

By focusing on passive measures rather than energy-intensive systems, Passive House buildings use up to 90% less heating and cooling energy compared to conventional structures.

Mechanical ventilation

Mechanical ventilation with heat recovery is a key Passive House principle that ensures efficient energy conservation by extracting stale air while recovering and transferring heat to incoming fresh air, maintaining indoor air quality and thermal comfort.

According to Trevor Lorge, Director at iSwirl, throughout Australia and other parts of the world, many residential homes have installed rooftop ventilators. The most common of these is the onion-shaped whirlybird. The benefits of rooftop ventilators are well known.

Above: iSwirl on a tiled roof/supplied.

Most importantly they help ensure a reduction in heat build-up in the roof cavity and a reduction in moisture build-up in the roof cavity.

A reduction of heat in the roof cavity provides for a more comfortable and cooler environment in the living or working space below while a reduction in moisture in the roof cavity leads to less opportunity for mould and mildew to flourish.

“Unfortunately, most conventional rooftop ventilators/whirlybirds are powered and operated only by wind,” says Lorge.

“They require the wind force to rotate wind vanes to ensure the extraction of air from the roof cavity. Their disadvantage is that they fail to extract air if there is no wind.”

Fortunately, iSwirl has launched a unique and patented product that utilises BOTH wind and solar energy, to increase the efficiency of the air-extraction process.

The iSwirl utilises wind force to drive the rotation of wind vanes, like a whirlybird. In addition, it utilises solar energy, captured via a photovoltaic panel that powers a 24v motor that is connected to a fan blade to extract air at a much greater volume than traditional single-powered wind ventilators.

The solar panel and wind vanes are directly integrated within a moulded head and are easily attached to the roof via a collar.

“A few new products on the market have tried to address this issue, by utilising solar cell technology so that the ventilator operates using sunlight energy when ventilation is most needed, rather than relying on wind,” says Lorge.

“Unfortunately, the aesthetics of most of these products is sub-optimal and “unsightly”. These also operate on sunny days as they are solar only. There are no roof ventilators that use both wind and solar in combination to address this issue within the same product.

“This was seen to be a real deficiency of design in ‘wind only’ or ‘solar only’ ventilators. Hence the design and launch of the innovative iSwirl product.”

Thermal bridge-free design

Thermal bridge-free design eliminates areas in a building's envelope where heat can bypass insulation, such as around windows, doors, and structural elements. This Passive House principle minimises heat loss, prevents cold spots and condensation, and enhances overall energy efficiency.

“Paarhammer Passive House windows and doors are the only Australian-made timber windows with International Passive House Component Certification from the Passivehaus Institute in Germany, while at the same time having been tested and approved to all relevant Australian Standards,” says Paarhammer Business Development Manager Edith Paarhammer.

“We are also in the process of getting our composite Wood-Alu Range (timber inside, aluminium outside) certified for International Passive House Component Certification.”

Paarhammer has been a member of the Australian Passive House Association for many years.

“We believe in increasing the energy efficiency of building envelopes, thermal comfort, and healthy living, with minimal energy consumption. For almost 35 years we have manufactured highly energy-efficient windows and doors of European style with tilt & turn windows and lift-slide sliding doors among other opening options,” Paarhammer says.

Paarhammer has two Certified Passive House Tradespeople on staff and in-house knowledge to perform all required thermal calculations.

The company’s timber windows as well as Wood/Alu composite windows are available custom-made for Passive House buildings, with a range suitable even for high bushfire areas.

“Several of the buildings Paarhammer has supplied windows and doors for have had a blower door test performed with excellent results,” Paarhammer says.

“Some of these are certified Passive Houses, others are built to Passive House principles.”

High-performance windows and doors

High-performance windows and doors are a fundamental Passive House principle, designed with advanced glazing, airtight frames, and optimal thermal insulation to minimise heat loss, maximise solar gain, and maintain a comfortable indoor climate while reducing energy demand.

Established in 2009, BINQ is Australia’s largest manufacturer of advanced, high-performance window systems.

“At BINQ, we believe windows are the most important element in a building, having a dramatic impact on the design, aesthetics, functionality, liveability, and performance of a home,” says BINQ Managing Director Jacob Cosentino.

Above: The Panel House, implementing BINQ solutions/Marnie Hawson.

BINQ specialise in European high-performance windows, meaning windows designed and manufactured to meet the stringent energy efficiency standards prevalent in Europe.

Key features of European high-performance windows include low U-values, optional triple glazing, low-E coatings, argon gas, warm edge spacers, air-tight construction, and quality frame materials.

“As much as 25 - 40% of energy loss can be attributed to leaky walls and windows. Even if a home has high R-Value insulation installed behind the floors, walls, and ceiling, under-performing windows and poor installation can be detrimental to the building’s thermal performance,” Cosentino says.

All BINQ doors and windows are made to order, hence making the designs quite flexible. The design of the operable sash and how it interacts with the frame is also carefully considered to ensure minimum air leakage is achieved. This is tested and quantified during the AS2047 testing cycles and is published.

“A key element in this outcome is to have windows that perform well but it’s important to reiterate that high performance windows alone may not prevent condensation from occurring,” Cosentino says.

Airtight construction

Airtight construction is a core Passive House principle, ensuring the building envelope is sealed to prevent uncontrolled air leakage, reducing heat loss, improving energy efficiency, and maintaining a comfortable and consistent indoor environment

Fisher & Paykel Home Solutions helps deliver Operational Net Zero Homes by integrating solar generation, battery storage, space & water heating, and top-tier appliances from Fisher & Paykel and Haier.

Above: Proposed screening to limit heat gain on the Brunswick house of Antony Martin, MRTN Architects, part of the recommended solution set from Fisher & Paykel Home Solutions’ thermal design engineer/supplied.

“With support from our in-house design service Fisher & Paykel Homes Solutions has been established to provide an integrated approach to solving the challenge of managing energy in the built environment. This holistic approach to energy management sets a new standard in energy efficiency,” General Manager Marketing - Home Solutions Nicole Stock says.

The Home Solutions design team aims to bridge the gap between the theoretical application of passive design and holistic design solutions by quantifying the impact of design decisions on the home energy consumption.

The design service quantifies the impact of design decisions when designing using Passive House principles at a specific site. By providing insights through the accurate modelling of the household specific to its site, occupancy and location, the home can be tailored to the specific needs and requirements of the owners.

“We work alongside architects, designers and homeowners for the duration of the project to provide insights and guidance around how best to achieve the energy goals of the project. When the home's energy is optimised, we then work together to specify, supply and install the right appliances for the home,” Stock says.

“With a single point of contact for the duration of the project, and nationwide coverage providing support and service for all of the products we offer, we provide a unique offering in the marketplace.”

High-quality insulation

High-quality insulation is a key Passive House principle, providing continuous and effective thermal resistance throughout the building envelope to minimise heat loss, enhance energy efficiency, and ensure a stable and comfortable indoor climate year-round.

Bondor Metecno's SolarSpan is an all-in-one insulated roofing panel that combines roofing, insulation, and a pre-painted ceiling, providing high thermal efficiency essential for the Passive House high-quality insulation principle. The product ensures airtightness, a critical factor in achieving Passivhaus certification, as demonstrated in projects like the Hamptons Passive House.

Above: SolarSpan by Bondor Metecno in situ/supplied.

“SolarSpan is Australia's leading insulated roofing panel offering long-spans, low pitch and high thermal efficiency to satisfy commercial, industrial and residential applications,” says Andrew Hudson, National Specification Sales Manager, Bondor Metecno Australia.

With architectural appeal, offering higher ceilings for spacious living areas, clean roof lines and superior comfort, SolarSpan creates a thermal barrier over the home, delivering better energy-efficiency with less reliance on heating and cooling to lower energy costs for homeowners.

SolarSpan insulated roof panels are lightweight and easy to install. The panels feature insulting core material held in place by two steel facings, this creates a continuous insulating envelop that will not crumble or sag over time like other forms of insulation.

The panels lock together forming an airtight seal, that does not require any taping or other fillers. This continuous building envelop reduces air leakage, improving energy efficiency and saving on heating and cooling costs.

“Replacing four individual products (roof trusses, ceiling, insulation and roof sheeting) with one insulated panel also means a better outcome for the environment with less site waste and fewer site deliveries to manage,” says Hudson.

“From a design perspective, eliminating the need for traditional roof trusses means home designs can adopt higher ceilings, offering open and spacious living areas, especially important with the design and space limitations for smaller lots and infill developments.”

Passive House principles are actively transforming Australian homes, proving that being "passive" can lead to big energy savings. With innovations from iSwirl, Paarhammer, BINQ, Bondor Metecno, and Fisher & Paykel Home Solutions, these homes combine style and sustainability, building a greener future with ease.

Main Image: Clifton Hill Passive House Primary School incorporating Paarhammer solutions/Peter Clarke.

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