What does it really mean for a building to be 'green'?

Walk past a new apartment development promoting its sustainability credentials and it's easy to picture rooftop gardens, mature trees, landscaped courtyards and residents surrounded by nature.

But in many cases, that's not actually what those sustainability ratings guarantee.

Australia's leading environmental rating tools have played a significant role in improving the energy efficiency and environmental performance of buildings. Yet despite their focus on reducing emissions, many don't require developers to include trees, biodiversity or meaningful green space.

In other words, a building can achieve one of the country's highest sustainability ratings while containing little more than concrete, glass and hard landscaping.

That disconnect has led to the emergence of a new movement across Australia's property industry: nature-based cities.

The concept goes beyond designing buildings that consume less energy. Instead, it encourages developers to treat nature as essential infrastructure, integrating biodiversity, tree canopy, living landscapes and green spaces into projects from the earliest stages of planning.

Research has consistently linked access to nature with better physical and mental health, cooler neighbourhoods, improved biodiversity, stronger climate resilience and more connected communities. As Australia's cities continue to become denser, advocates say those outcomes should be considered just as important as energy efficiency.

Nature Based Cities (NBC) was established in 2022 to help accelerate that shift.

Founded by Hamton Executive Chairman Paul Hameister OAM, the not-for-profit was created after research highlighted a significant gap in Australia's sustainability framework. While existing environmental rating tools rewarded energy performance and emissions reductions, they placed little emphasis on the inclusion of living landscapes.

"We've always wanted to do more, and we know other developers who want to do more, but the ESD rating tools just aren't there," Hameister says.

"In Australia, you can have a five-green-star rated building that's concrete and glass with not a blade of grass.

"The focus is on reducing emissions, which is laudable, but there hasn't been enough attention paid to protecting and re-establishing nature. We need both for the health of the environment and for communities."

Since its launch, NBC has developed independent design guidelines and accreditation frameworks that encourage developers to prioritise ecology, biodiversity, tree canopy, walkability and living landscapes alongside traditional sustainability measures. The organisation first focused on medium and high-density residential developments before recently expanding into precinct-scale communities and masterplanned neighbourhoods.

Jan Talacko, founder of sustainability consultancy Ark Resources and a member of the Nature Based Cities Advisory Council, says the initiative addresses an area that has largely been overlooked by the property industry.

"Throughout my 25 years of working collaboratively with all stakeholders in the property sector, I've always favoured a pragmatic approach to sustainable design which encourages initiatives that not only meet environmental expectations but also improve amenity," Talacko says.

"Whilst we are making steady progress in relation to energy and carbon emissions from buildings, there has been much less emphasis on encouraging biodiversity and tackling the urban heat island effect.

"The Nature Based Cities initiative responds to a gap in the suite of tools currently used by the property development sector, which don't provide sufficient incentive, or recognition, for the integration of landscaping and greenery."

For apartment buyers, the shift is also changing the questions worth asking.

Rather than assuming a sustainable building will naturally include abundant green space, buyers are increasingly being encouraged to look beyond environmental ratings and ask what nature is actually being delivered. How much tree canopy will the development create? Has biodiversity been considered? Are landscaped spaces designed for people as well as appearance?

As Australia's cities continue to grow upwards and outwards, the next generation of sustainability may not simply be measured by lower emissions, but by how successfully developments bring nature back into everyday urban life.