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The Recycled Interiors Podcast 004: What Makes a Home Sustainable?

the importance of passive design and energy efficiency in building your home

Welcome to episode 4 of the Recycled Interiors Podcast! Today we are chatting about designing and building a sustainable home with Simon Clark – Sustainable Homes Melbourne. Simon has been building homes for 15 years, and before that, watching his Dad build them. You could say it is in his blood! Simon started ‘helping’ his dad build homes when he was about 7 or 8 years old, and from about 14 years old he began working with his dad most weekends. “I became a fully qualified carpenter at the age of 21, and I couldn’t start my own business quickly enough. During these first few years of working as a qualified carpenter, I studied to get my builder’s registration,” he says.
Passionate about building, Simon obtained his builder’s registration at the age of 24, and could finally become a sole contractor and start building homes for people. He did this for over 2 years, but never thought twice about the health or comfort of the homes he was building, and least of all about the environmental impact these homes were having. His plan all along was to pack up the business and explore the world, so in 2012 he did just that: – packed his bags and took off overseas with an open ticket, not knowing whether he wanted to return and continue building or what he wanted to do.
The journey was more than just a holiday. He travelled all through Asia, North America, and then over to Europe, discovering so many cultures we are often sheltered from here in Australia. “From my experiences observing how tribal communities in rural Thailand live so self-sufficiently, to the way homes are built in Canada, the US and Europe; I developed an understanding that there is so much more to our built environment than I had previously thought”.
His time in London brought the opportunity to study Green Energy Assessment at a time when the UK was working to reduce Carbon Emissions, alongside the European Union. The UK was starting to increase the energy efficiency of existing homes, which is where green energy assessment came in. Assessors were trained to enter into a home, produce a report on the performance of the home, and then recommend upgrades that can increase the home’s health, comfort and energy efficiency. On completion of the Diploma and his further research on our impact on the planet, Simon wanted to take it further, but he was really confused as to how to go about it. “I wasn’t sure I wanted to be a builder, I thought of studying to be a sustainable architect, an environmental lawyer or even a scientist. But within only a couple of weeks I chose to return to Australia and see what could be done here.”
He returned in August 2013 and co-founded Sustainable Homes Melbourne with long-time friend Michael Burns in February of 2014. “It’s been a hell of a journey with its ups and downs. We have such a long way to go to be anywhere near where we want to be in respect to sustainability, and even then we must strive to go further and further. Sustainability is an endless pursuit and as the current western world is, we are a world away from where we ought to be.”
Simon and Michael believe our potential to help the planet and bring a positive change to our built environment is endless. Their dream is to help everyday Australians live healthy, happy family lives in a home they can be proud of, and which will endure generations.
“Sustainable building is merely a process of consciousness and there are so many levels as to what sustainability really is. You may consider the performance of your home to be of most importance to decrease the operational energy consumption of a home. Or you may be thinking of the larger picture of limiting the amount of natural resources and degradation that will affect the environment from the building of your home,” Simon explains. Sustainability starts with only taking what you need. The average size of an Australian home is 250m2. But do we really NEED need that much space?

Links Mentioned in the Show

Sustainable Homes Melbourne
Phase Change Materials
Hempcrete Australia
Fly Ash

Things you will want to remember from the episode

  • There is a focus on energy efficient homes, but you can not forget things like the journey of the materials to get to you in considering a sustainable project
  • There is no point building a passive home if you are not living in the home in a sustainable way
  • Steel can be recycled and has an ongoing life – what is more sustainable in the long term, timber or steel? There may not be an answer and it is more about weighing up what fits best for your project
  • The goal posts are always moving in sustainable design
  • Upcycling a house is possible!
  • Focusing on the fabric of the house – reverse brick veneer with thermal mass on the outside and insulation on the inside, is actually the best way to build. This means the bricks are on the inside and the cladding is on the outer. Insulation is always better on the outside of a home – eg cladding, or rendering
  • The typical type of construction in Australia of building brick veneer homes, is quite specific to our country and not the best way to build
  • Thermal mass = concrete, brick, stone, or rock etc that can absorb sunlight as heat and energy and then release it back into the home at night time to maintain more moderate temperature
  • It works really well in “summer houses” – those which are in warmer environments
  • Older houses that have no or little insulation, will be cold in winter, but work really well in summer as they can protect the interior from the heat. Insulation is your best friend!
  • If you are building a new home, consider the relationship between the thermal mass and the insulation
  • Passive houses take a fabric first approach – making sure there is a really good blanket around the home. A Passive House standard was created in Germany in the 1970’s, focused on making an airtight home with really thick insulation – don’t require a heating source. This is not as common in Australia
  • Solar passive design uses the environment that your home is built in – this is more common in Australia – using sun angles, breezeways etc for heating and cooling your home. In the colder climates such as Melbourne, most homes need some heating source, but if designed and oriented appropriately, can get away without artificial cooling in summer
  • In an existing home, insulation is your best friend. Older homes may not have insulation, this makes an enormous difference. You can get spray in insulation that goes in your walls if you have timber frame, but it is hard to find these companies. Under floor is good if you can access it, but you lose the most heat through the roof. Look for low toxin and eco friendly insulation products
  • Double glazing in Australia is different to overseas – Simon tends to remove old windows and put new high performing windows into a build
  • Fixing draughts is important – get weather stops for doors and seal the gaps; small gaps around windows and doors really add up. No more gaps around architraves and skirting boards can make a big difference to the temperature in your home. Keeping the outside out and the inside in – sealing well around windows and doors, double glazing windows, etc
  • Shading the summer sun is important for cooling. Plant trees that will do that for you or add summer shading that is openable and able to be shifted around to suit the sun angles for different times of year. You need to be conscious about how the environment around your house works
  • Designers and builders such as Simon, can assist you in working these things out when building or renovating
  • Phase change material  – acts as a thermal mass – it is liquid when it is warm and solid when it is cold – when the sun hits it, it gets absorbed and as it cools down it turns back to solid and releases the heat – it goes inside the walls of your home (how cool!)
  • In a new build
    • The smaller you can keep your home, the less material and embodied energy you are using
    • Keep it as local as you can – you do not need fancy windows from Europe! Australian products are just as good and very high standard
    • Steer away from concrete if possible, as it is often unsustainable in its production process. The upside of polished concrete on its own is you are reducing the materials if not adding other flooring, and it does have a good thermal mass
    • Alternatives for flooring now include hempcrete and fly ash
  • Building smaller homes, and having more than one home on a block, can be more sustainable than spreading out into other ecosystems – but you do need to consider the impact on the people living in the home, and their neighbours!
  • Simon’s tips for a more sustainable lifestyle
    • Ride or walk to work if possible
    • Be conscious of what you are buying in your days – refuse to buy plastic water bottles and other single use plastics
    • Shop organically and locally
    • Use paper bags instead of plastic when shopping
    • Take every opportunity to educate other people
    • Buy second hand clothes – it is fun and good for the planet, as well as contributing to charities
    • Simon chooses to be vegetarian to reduce reliance on livestock, which is contributing massive amounts of greenhouse gases – this is a hard one, and a personal choice, but one to definitely think about more, reduce your red meat at least if you are not going to go wholly vegetarian, and look for free range, organic meats
    • Stay as conscious as you can about the impacts down the line of the choices you make
    • But DON’T become obsessed or guilty about it – do at least one thing each day

We hope you enjoyed today’s episode!
Be sure and subscribe for the latest on  itunes here and Stitcher here or subscribe to the newsletter for the Friday mail out which will include the latest episode.
And if you like what you hear, please leave us a review!


  1. Adam Walsh on August 3, 2016 at 8:31 pm

    Great work Simmo.

  2. Recycled Interiors & The Sustainable Home Hub on August 6, 2016 at 6:17 am

    so pleased to have you!

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