Passive house and aged care facility design
Australia’s aged care sector is under pressure from almost every direction. The combination of rising construction costs, energy bills that have increased dramatically in recent years, staff retention challenges and a regulatory environment demanding higher standards of care quality is all adding pressure to the sector.
Against that backdrop, passive house design can offer something useful: a building standard that reduces operating costs, improves resident health outcomes and creates environments that are measurably better to live and work in.
And the conversation is no longer theoretical. Australia’s first passive house retirement villa has opened in Canberra, demonstrating that the standard is achievable in an aged care context and setting a benchmark for what the sector can aspire to.
Why aged care facilities are natural candidates for passive house
The case for passive house design in aged care begins with the occupants. Elderly residents – particularly those with respiratory conditions, cardiovascular disease or compromised immune systems – are among the populations most sensitive to indoor air quality, thermal comfort and acoustic environment. These are the parameters that passive house designs control most effectively.
An older person living in a poorly insulated, draughty conventional facility is exposed to cold stress in winter and heat stress in summer, elevated allergen and pollutant levels from uncontrolled air infiltration, and the chronic low-level noise of mechanical systems cycling on and off. None of these conditions are acceptable in a modern care environment, and yet they’re the default in a large proportion of Australia’s existing aged care stock.
A passive house design aged care facility in Australia addresses all of them at a structural level, through the building fabric rather than through active systems that require energy to run and maintenance to keep functioning.
Thermal comfort and resident health
Thermal stability is one of the defining features of passive building design, and one of its most significant advantages in an aged care context. Elderly residents are physiologically less able to regulate their own body temperature than younger adults. They’re more vulnerable to heat stress in summer and cold stress in winter, and the consequences of thermal discomfort are more serious, including increased cardiovascular strain, elevated fall risk, aggravated respiratory conditions and compromised immune function.
An aged care facility built to passive house standards maintains stable internal temperatures year-round without relying on mechanical heating and cooling systems to compensate for a poorly performing envelope. Residents move through the building – from bedroom to common areas to dining rooms – without encountering the cold corridors, draughty doorways and overheated rooms that characterise conventionally built facilities.
Indoor air quality and respiratory health
The mechanical ventilation with heat recovery (MVHR) system in a passive house design supplies continuous filtered fresh air throughout the building, removing allergens, particles and pollutants before they reach occupied spaces. For aged care residents with asthma, COPD, cardiovascular disease or compromised immunity, this can create a reduction in the environmental health burden they carry every day.
Humidity management is also important. Passive house designs in Australia maintain indoor relative humidity within a range that discourages mould growth and dust mite proliferation – two of the most significant contributors to respiratory irritation in indoor environments.
For residents who spend the majority of their time inside the facility, the cumulative effect of breathing cleaner, better-managed air over months and years is significant.
Acoustic environment and well-being
Noise is an underappreciated factor in aged care quality. Dementia residents are particularly sensitive to the acoustic environment as elevated noise levels increase agitation, disrupt sleep and interfere with communication. Staff working in noisy environments also experience higher stress and fatigue.
The improved acoustic performance of a passive house design in Australia is a direct consequence of its triple-glazed windows, continuous insulation and airtight construction, which produces environments that are measurably quieter than conventionally built equivalents.
The operational costs
Aged care facilities are large energy consumers. They need to heat and cool large volumes of space continuously, run commercial kitchens, laundries and clinical equipment and maintain hot water systems across multiple buildings. As a result, the energy bill of a typical aged care facility is substantial and, in the current Australian energy market, increasingly difficult to manage.
Passive building design reduces the heating and cooling component of that energy bill dramatically. The building fabric does the thermal regulation work that mechanical systems would otherwise have to perform, and the reduction in energy demand flows directly to the bottom line.
For an aged care operator facing a 30 to 40-year asset life, the cumulative operational saving from a passive house design over conventional construction can be significant enough to offset a meaningful proportion of the construction premium over the life of the building.
Plus, when paired with rooftop solar and battery storage, the potential for aged care facilities to achieve near-zero energy costs for heating and cooling is genuine and achievable.
Design considerations specific to aged care
Applying passive house design principles to an aged care facility will require some specific considerations beyond the standard residential application. Larger building volumes, higher occupancy densities, more complex ventilation zoning requirements and the need to accommodate clinical equipment and commercial services all need to be integrated with the passive house envelope strategy.
Accessibility is central, as a passive house design in Australia for aged care needs to meet or exceed the accessibility requirements of the Disability Discrimination Act and relevant Australian standards, while maintaining the continuous insulation and airtightness that the standard requires. This means your passive house designer will need to coordinate aspects like threshold detailing at doorways, accessible bathroom configurations and the integration of mobility aids with airtight door seals required by passive house standards.
Infection control is another very specific consideration. The MVHR system in a passive house can be zoned to prevent air recirculation between areas of the facility where infection risk is elevated – a feature that became particularly important during the COVID-19 pandemic and that remains a relevant design consideration for any aged care facility.
