.

  • Written by Trivess Moore, Lecturer, RMIT University

New housing in Australia must meet minimum energy performance requirements. We wondered how many buildings exceeded the minimum standard. What our analysis found is that four in five new houses are being built to the minimum standard and a negligible proportion to an optimal performance standard.

Before these standards were introduced the average performance of housing was found to be around 1.5 stars. The current minimum across most of Australia is six stars under the Nationwide House Energy Rating Scheme (NatHERS).

This six-star minimum falls short of what is optimal in terms of environmental, economic and social outcomes. It’s also below the minimum set by many other countries.


Read more: Low-energy homes don't just save money, they improve lives


There have been calls for these minimum standards to be raised. However, many policymakers and building industry stakeholders believe the market will lift performance beyond minimum standards and so there is no need to raise these.

What did the data show?

We wanted to understand what was happening in the market to see if consumers or regulation were driving the energy performance of new housing. To do this we explored the NatHERS data set of building approvals for new Class 1 housing (detached and row houses) in Australia from May 2016 (when all data sets were integrated by CSIRO and Sustainability Victoria) to December 2018.

Our analysis focuses on new housing in Victoria, South Australia, Western Australia, Tasmania and the ACT, all of which apply the minimum six-star NatHERS requirement. The other states have local variations to the standard, while New South Wales uses the BASIX index to determine the environmental impact of housing.

The chart below shows the performance for 187,320 house ratings. Almost 82% just met the minimum standard (6.0-6.4 star). Another 16% performed just above the minimum standard (6.5-6.9 star).

Only 1.5% were designed to perform at the economically optimal 7.5 stars and beyond. By this we mean a balance between the extra upfront building costs and the savings and benefits from lifetime building performance.

NatHERS star ratings across total data set for new housing approvals, May 2016–December 2018. Author provided

The average rating is 6.2 stars across the states. This has not changed since 2016.

Average NatHERS star rating for each state, 2016-18. Author provided

The data analysis shows that, while most housing is built to the minimum standard, the cooler temperate regions (Tasmania, ACT) have more houses above 7.0 stars compared with the warm temperate states.

NatHERS data spread by state. Author provided

The ACT increased average performance each year from 6.5 stars in 2016 to 6.9 stars in 2018. This was not seen in any other state or territory.

The ACT is the only region with mandatory disclosure of the energy rating on sale or lease of property. The market can thus value the relative energy efficiency of buildings. Providing this otherwise invisible information may have empowered consumers to demand slightly better performance.


Read more: Energy star ratings for homes? Good idea, but it needs some real estate flair


We are paying for accepting a lower standard

The evidence suggests consumers are not acting rationally or making decisions to maximise their financial well-being. Rather, they just accept the minimum performance the building sector delivers.

Higher energy efficiency or even environmental sustainability in housing provides not only significant benefits to the individual but also to society. And these improvements can be delivered for little additional cost.


Read more: Sustainable housing's expensive, right? Not when you look at the whole equation


The fact that these improvements aren’t being made suggests there are significant barriers to the market operating efficiently. This is despite increasing awareness among consumers and in the housing industry about the rising cost of energy.

Eight years after the introduction of the six-star NatHERS minimum requirement for new housing in Australia, the results show the market is delivering four out of five houses that just meet this requirement. With only 1.5% designed to 7.5 stars or beyond, regulation rather than the economically optimal energy rating is clearly driving the energy performance of Australian homes.

Increasing the minimum performance standard is the most effective way to improve the energy outcomes.

The next opportunity for increasing the minimum energy requirement will be 2022. Australian housing standards were already about 2.0 NatHERS stars behind comparable developed countries in 2008. If mandatory energy ratings aren’t increased, Australia will fall further behind international best practice.

If we continue to create a legacy of homes with relatively poor energy performance, making the transition to a low-energy and low-carbon economy is likely to get progressively more challenging and expensive. Recent research has calculated that a delay in increasing minimum performance requirements from 2019 to 2022 will result in an estimated A$1.1 billion (to 2050) in avoidable household energy bills. That’s an extra 3 million tonnes of greenhouse gas emissions.


Read more: Buildings produce 25% of Australia's emissions. What will it take to make them 'green' – and who'll pay?


Our research confirms the policy proposition that minimum house energy regulations based on the Nationwide House Energy Rating Scheme are a powerful instrument for delivering better environmental and energy outcomes. While introducing minimum standards has significantly lifted the bottom end of the market, those standards should be reviewed regularly to ensure optimal economic and environmental outcomes.

Trivess Moore has received funding from various organisations including the Australian Research Council, Victorian Government and various industry partners.

Michael Ambrose has received funding from government departments including the Department of Environment and Energy and the CRC for Low Carbon Living. CSIRO owns the AccuRate Sustainability software which is the benchmark tool used in the NatHERS software accreditation process. CSIRO receives financial benefit from the creation of NatHERS Certificates which is then used to maintain and develop the accreditation software.

Stephen Berry has received funding from various industry and government organisations including the Australian Research Council, the Government of South Australia, and the CRC for Low Carbon Living.

Authors: Trivess Moore, Lecturer, RMIT University

Read more http://theconversation.com/australias-still-building-4-in-every-5-new-houses-to-no-more-than-the-minimum-energy-standard-118820

'Making up games is more important than you think': why Bluey is a font of parenting wisdom

Bluey is not just a TV success story - it also contains important parenting wisdom. IMDBBluey is a ground-breaking Australian children’s television series and the most downloaded show in ABC iV...

Koa Whittingham, Psychologist and Research Fellow, The University of Queensland - avatar Koa Whittingham, Psychologist and Research Fellow, The University of Queensland

Teeth 'time capsule' reveals that 2 million years ago, early humans breastfed for up to 6 years

The teeth in these _Australopithecus africanus_ skulls contain important evidence about the nutrition of these individuals as they grew up. Renaud Joannes-Boyau, Author providedHumans’ distant ...

Renaud Joannes-Boyau, Senior research fellow, Southern Cross University - avatar Renaud Joannes-Boyau, Senior research fellow, Southern Cross University

Four Corners’ forced labour exposé shows why you might be wearing slave-made clothes

Target, Cotton On, Jeanswest, Dangerfield, IKEA and H&M are among the brands in Australia sourcing cotton from Xinjiang. www.shutterstock.comWith China’s western-most province of Xinjiang be...

Yvette Selim, Interim Deputy Director, Anti-Slavery Australia, University of Technology Sydney - avatar Yvette Selim, Interim Deputy Director, Anti-Slavery Australia, University of Technology Sydney

Hand sanitisers in public won't wipe out the flu but they might help reduce its spread

It's quicker to use hand sanitiser than soap and water, which means people might be more likely to use it. ShutterstockThis year’s flu season is off to an early start, with 144,000 confirmed ca...

Trent Yarwood, Infectious Diseases Physician, Senior Lecturer, James Cook University and, The University of Queensland - avatar Trent Yarwood, Infectious Diseases Physician, Senior Lecturer, James Cook University and, The University of Queensland

Wind and solar cut rather than boost Australia's wholesale electricity prices

Power failure. It's gas, not wind, that's pushing up electricity prices. ShutterstockWholesale prices in the National Electricity Market have climbed significantly in recent years. The increase has co...

Zsuzsanna Csereklyei, Lecturer in Economics, RMIT University - avatar Zsuzsanna Csereklyei, Lecturer in Economics, RMIT University

Reading and writing assistance increases the chance of getting a Disability Support Pension

One in eight disability support claims rejected are because the applicant is unable to supply the requested information. ShutterstockThe 2019 Australian Conference of Economists is taking place in Mel...

Nary Hong, PhD candidate in Economics, UNSW - avatar Nary Hong, PhD candidate in Economics, UNSW

Meet the endangered Bunyip bird living in Australia's rice paddies

Endangered species are living happily in rice fields. Bitterns in Rice/Matt Herring, Author providedThe debate around the Murray-Darling Basin is often sharply polarised: irrigation is destroying the...

Matt Herring, PhD Candidate, Charles Darwin University - avatar Matt Herring, PhD Candidate, Charles Darwin University

Regional cities beware – fast rail might lead to disadvantaged dormitories, not booming economies

Many commuters already travel from regional cities to work in capital cities like Melbourne so what impacts will fast rail have? Alpha/Flickr, CC BY-NCGovernments are looking to fast rail services to ...

Todd Denham, PhD Candidate, School of Global, Urban & Social Studies, RMIT University - avatar Todd Denham, PhD Candidate, School of Global, Urban & Social Studies, RMIT University

Curious Kids: can people live in space?

People do live outside Earth – on the International Space Station! But humans have had to find a way to make the conditions there more like what we’re used to at home. Flickr/NASA's Marsh...

Jonti Horner, Professor (Astrophysics), University of Southern Queensland - avatar Jonti Horner, Professor (Astrophysics), University of Southern Queensland

Extremist mobs? How China's propaganda machine tried to control the message in the Hong Kong protests

When protesters took to the streets in Hong Kong, China's state media had several tactics for how to describe it: some outlets ignored it, while others railed against 'extremists'. Jerome Favre/AAPAs ...

Joyce Y.M. Nip, Senior lecturer, Department of Media and Communications; Department of Chinese Studies, University of Sydney - avatar Joyce Y.M. Nip, Senior lecturer, Department of Media and Communications; Department of Chinese Studies, University of Sydney

Top Beach Outfit Ideas Inspired by Fashion It Girls

Whether you are going on a beach vacation or just spending a lazy afternoon lying on the beach and listening to the waves crash the shore, the only thing that could make a carefree summer day even b...

Brigitte Evans - avatar Brigitte Evans

Southeast Asia was crowded with archaic human groups long before we turned up

The ancestral population of modern humans appears to have split as it moved across Asia. ShutterstockAround 55,000-50,000 years ago, a population of modern humans left Africa and started on the long t...

João Teixeira, Research associate, University of Adelaide - avatar João Teixeira, Research associate, University of Adelaide

Curious Kids: did the velociraptors have feathers?

Was velociraptor a feathered friend? Here's one artist's impression. ShutterstockCurious Kids is a series for children. If you have a question you’d like an expert to answer, send it to curious...

Caitlin Syme, PhD in Vertebrate Palaeontology, The University of Queensland - avatar Caitlin Syme, PhD in Vertebrate Palaeontology, The University of Queensland

Voice evidence in trials: can a criminal suspect be identified just by the sound of his voice?

Prosecutors should be required to consult forensic linguistic experts on cases involving voice evidence, rather than solely relying on 'ad hoc' experts. ShutterstockA few months ago, I received a call...

Ahmar Mahboob, Associate Professor of Linguistics, University of Sydney - avatar Ahmar Mahboob, Associate Professor of Linguistics, University of Sydney

1 in 10 patients are infected in hospital, and it's not always with what you think

Drips and other medical devices were potential sources of infection. But no-one expected to find hospital-acquired pneumonia and urinary tract infections. from www.shutterstock.comMost people expect h...

Philip Russo, Associate Professor, Director Cabrini Monash University Department of Nursing Research, Monash University - avatar Philip Russo, Associate Professor, Director Cabrini Monash University Department of Nursing Research, Monash University

It's a bad year for flu, but it's too early to call it the worst ever – 5 charts on the 2019 season so far

The impact of the flu on a population can be measured by looking at figures including cases, hospitalisations and deaths. From shutterstock.comFrom early this year it’s been apparent the 2019 Au...

Ian Barr, Deputy Director, WHO Collaborating Centre for Reference and Research on Influenza - avatar Ian Barr, Deputy Director, WHO Collaborating Centre for Reference and Research on Influenza

The long history of gender violence in Australia, and why it matters today

In 2015, the Australian federal government proclaimed that violence against women had become a national crisis. Despite widespread social and economic advances in the status of women since the 1970s, ...

Alana Piper, Postdoctoral Research Fellow, University of Technology Sydney - avatar Alana Piper, Postdoctoral Research Fellow, University of Technology Sydney

Explainer: what Western civilisation owes to Islamic cultures

Sculpture of ninth-century Persian scholar Al-Khwarizmi in Khiva, Uzbekistan. Latin discovery of Al-Khwarizmi's work introduced the numerals 0-9, one of many ways in which Islamic cultures have contri...

Constant Mews, Director, Centre for Religious Studies, Monash University - avatar Constant Mews, Director, Centre for Religious Studies, Monash University

Making deer fair game for unlicensed hunting is the right step for New South Wales

The fate of deer carcasses is a crucial consideration in monitoring the success of future culling. Emma Spencer, Author providedThe New South Wales government last week revealed plans to ease shooting...

Thomas Newsome, Lecturer, University of Sydney - avatar Thomas Newsome, Lecturer, University of Sydney

How to choose a Weber Q Barbeque

There are several barbeque brands in the Aussie market today, and it can be quite challenging to find the right one for you. Weber Q is a reliable, barbeque brand that comes in a wide variety of products to choose from. This article investigates th...

News Company - avatar News Company

6 Reasons Why Fresh Content Benefits Your Brand and SEO

When it comes to content marketing, most guides focus on the part where your content needs to be relevant, well-written and well-formatted, all of which are true. However, while all of them speak about quality, most of them forget to mention just...

Diana Smith - avatar Diana Smith

LifeStyle

The Gas Fireplace VS the Wood Fireplace

It’s that time of year again when the weather has turned chilly, everybody is putting out their ...

How to Revolutionize Your Beauty Experience

Being concerned with beauty and cosmetics used to mean frequent visits to the salon and sitting in...

8 Cool Yet Romantic Things to do in Australia

Australia is a wonderful place for vacationing this summer and you can beat the heat as they have ...

How to Banish Dark Circles without the Need for Cucumber Slices

Dark circles can be downright annoying, especially when you are getting enough sleep. So, what cau...