Inside Bluebush: Our GreenSmart Home of the Year 2026

Bluebush, our certified Passive House at Blackmans Bay, was named HIA Australian GreenSmart Home of the Year 2026 at the national awards in Melbourne on 22 July 2026. It also took HIA Australian GreenSmart Custom Built Home 2026. A national panel judged it the best sustainable home in the country for the year — and it did that on measured performance, not styling.

So what actually earns a home that title? It isn’t one clever feature. It’s a set of decisions that work together as a single system. Here’s a walk through each part of Bluebush, and why it matters when you’re building in Tasmania’s cool-temperate climate.

What makes a home airtight — and why 0.5 matters

The number people in the industry noticed first is the airtightness result: 0.5 air changes per hour at 50 pascals, one of the tightest homes ever tested in Tasmania. The certified Passive House limit is 0.6, so Bluebush came in comfortably inside it.

Airtightness measures how much uncontrolled air leaks through the building envelope — the gaps around windows, service penetrations, wall-to-roof junctions and the like. In a leaky home, that leakage is where your heat escapes and where cold, damp air sneaks in. You feel it as draughts and rooms that never hold their warmth. Getting to 0.5 isn’t luck; it’s detailing every junction properly and then blower-door testing the house to prove it, rather than hoping. It’s the single biggest lever on comfort and running cost, which is why it sits at the centre of all our Passivhaus work.

Why insulation is a continuous layer, not a number

Bluebush is wrapped in a continuous, super-insulated envelope — roughly R11 across the roof assembly, with super-insulated timber-framed walls. The word that matters there is continuous.

Insulation only works if it’s unbroken. Every gap or thermal bridge — a spot where a stud, slab edge or steel member carries heat straight through the wall — becomes a cold surface on the inside. Cold surfaces are where condensation forms and mould grows. By keeping the insulation continuous and the interior surfaces warm, the home stays dry as well as warm. A high R-value on a spec sheet means little if the layer is punctured; the performance comes from how it’s assembled on site by a certified Passive House team that details it properly.

What triple-glazed windows actually do

Windows are almost always the coldest surface in a house, and in a conventional Tasmanian home they’re where you see winter condensation streaming down the glass every morning. Bluebush uses triple-glazed European windows.

The point of triple glazing isn’t just to slow heat loss — though it does that dramatically. It’s to keep the inside face of the glass warm enough that the moisture in your indoor air never condenses on it. No condensation means no puddles on the sill, no rotting reveals, and no black mould in the corners. The glass stays clear and the room stays comfortable right up to the window, so you actually use the space beside it.

How the ventilation keeps air fresh without wasting heat

Once you make a home this airtight, you can’t rely on draughts for fresh air — and you wouldn’t want to. Bluebush runs balanced mechanical ventilation with heat recovery (HRV).

The system continuously supplies filtered fresh air to living areas and bedrooms and extracts stale, humid air from kitchens and bathrooms. As the outgoing air passes the incoming air in the heat exchanger, it hands over most of its warmth — so you get constant fresh air without throwing your heating out the window. The result is air that’s fresh and dry all year, filtered of pollen and dust, with the humidity that feeds mould never given a chance to build up. This is the mechanical heart of what makes a certified home healthy, and it’s covered in plain terms in what certified Passivhaus actually means.

Why all-electric, solar and heat-pump hot water go together

Bluebush is fully electrified — no gas on site — paired with rooftop solar PV and heat-pump hot water.

This combination is deliberate. Because the envelope does the heavy lifting, the home needs very little energy to stay comfortable: certified heating demand of just 10 kWh/m²·yr, against a Passive House limit of 15. A heat pump moves heat rather than burning fuel to make it, so hot water and space conditioning both run on a small amount of electricity — much of it generated on the roof. A low-demand, all-electric home you can power with your own solar is about as close to a self-sufficient, low-bill home as you can build in this climate. If you want to see what that shift does to running costs, put your own figures through our Passivhaus savings calculator.

The parts people forget: water and materials

Two elements round it out. Rainwater harvesting captures and reuses water on site, cutting mains demand — sensible in a place that swings between wet winters and dry summers. And low-VOC materials were specified throughout: paints, sealants and finishes chosen to avoid off-gassing volatile organic compounds into the indoor air.

That last one matters more than most people realise. In an airtight home with controlled ventilation, indoor air quality is something you can actually design for — so it makes no sense to fill the house with materials that pollute the very air you’ve worked so hard to keep clean and fresh.

Why it all won together

None of these features is exotic on its own. What earned Home of the Year 2026 is that they were combined, detailed and then independently verified as a working whole — a home that stays warm, dry, healthy and cheap to run through a Tasmanian winter, on a fraction of the energy a conventional house needs.

You can see the home itself on our Bluebush project page, the full list of what we won on our awards page, and the official results on HIA’s 2026 GreenSmart Award Winners list. The building science behind Bluebush isn’t reserved for award entries — it’s the standard we bring to every luxury home and custom home we build across Tasmania.