A feasibility estimate is an early range, built from independent estimators and our completed job data before the design is locked. The final estimate is the firm, line by line price at the end of preconstruction. Done properly, they line up. On this retrofit, four early numbers pointed near $1.6m.

We can't demolish our way to better homes. Most of the houses Australians will be living in for the next fifty years are already standing, and most of them are cold, leaky and expensive to run. Knocking them all down and starting fresh is a fantasy, both financially and environmentally. Fixing the ones we've got is not.

Choose a Passive House builder in Melbourne on runs on the board, not talk. You want someone who has built a few, with a team that cares, not a builder learning on you. Ask to speak to past clients, ask how they run pre-construction, and demand tested blower door results.

Retrofitting is dangerous when you seal and insulate a home without controlling moisture. Warm indoor air carries water vapour, and when it hits a cold surface inside a wall it condenses, feeding rot and hidden mould. A safe retrofit manages vapour with the right membranes and ventilation, modelled up front.

No, Passive House isn't a scam. It's the only building standard in Australia that tests whether the finished house performs, with an independent blower door test and certification. The critics are right that it costs more than the legal minimum. They're wrong that the legal minimum is worth aiming for.

Architects should design for performance, not awards, because awards reward how a building photographs, not how it works for the family inside. A home that wins a prize but fails its occupants is a beautiful failure. Performance is tested with a blower door and PHPP. A trophy is an opinion.

You retrofit a Melbourne home for energy efficiency by fixing the shell first. Airtightness, insulation, better windows and thermal bridges come before solar or a new heater. Seal it, insulate it, then add heat recovery ventilation so it breathes. Done right and tested, a retrofit transforms how the house performs.

The 90% energy saving claim is everywhere in Australian Passive House marketing. It is also, in the way it is usually stated, misleading. Not because Passive Houses do not perform. They do. But because the number comes from a comparison that most people quoting it do not understand, and using it without context does more damage to the credibility of certified Passive House construction than any critic ever could. Here is the honest version.

There are thousands of words written about what a Passive House is supposed to do. There are very few verified numbers showing what one actually does, in Melbourne's climate, in a real home, after construction is complete and people are living in it. These are those numbers.There are thousands of words written about what a Passive House is supposed to do. There are very few verified numbers showing what one actually does, in Melbourne's climate, in a real home, after construction is complete and people are living in it. These are those numbers.

A 7.1-star NatHERS energy rating sounds impressive. The Forrest Passive House in Spotswood has one. It also has a certified blower door result of 0.41 ACH50 and a heating demand of 13.1 kWh per square metre per year. Those are not the same thing, and understanding the difference could change every decision you make about your next home.

Anyone can claim a home is high performance. Very few builders have ever tested one. Here is every number from the Forrest Passive House in Spotswood, pulled directly from the certified PHPP post-construction file and the blower door test report.

Most builders will tell you their insulation levels exceed the minimum. They have no idea what their walls actually achieve. Here is every assembly in the Forrest Passive House in Spotswood, every U-value, every material layer, every heat loss figure, and exactly why each decision was made from a building physics and durability standpoint.

Most builders take the job and figure it out later. We priced a renovation, told the clients it was not good enough, and walked away from the fee. What happened next changed everything about how Carland Constructions builds.

Everyone wants the number. Fair enough. But if you are hoping it is the same price as a standard build with a few extra insulation batts, it is not. A certified Passive House is high-end architecture built to a verified performance standard. The honest answer is more nuanced than a single figure, and understanding why will change how you think about your budget entirely.

Every certified Passive House Carland Constructions has built performs at a level that would make most Melbourne homes look embarrassing. But one of our projects sits noticeably higher on the heating demand chart than the others. Some people see that number and assume something went wrong. Nothing went wrong. That higher number is the most honest thing on the page.

The industry is currently obsessed with theoretical stars. A 7-star energy rating assumes your insulation is perfect and your building envelope is tight. In reality, without a Blower Door Test, those stars are just a guess.

Most builders walk away from a site without ever knowing if the air control layer actually works. At Carland Constructions, we do not guess. We verify the building physics of every project so our clients know they are getting the performance they paid for.

The most common question we get is: How much more does a Passive House cost? The answer depends entirely on what you are comparing it to. If you are looking at a bare-bones volume build, there is a premium. But if you are comparing it to high-end custom architecture, a Certified Passive House usually sits at the exact same price point.

Most builders think they can hit 7-star energy codes by just stuffing more glass wool into the walls. In reality, thick insulation in a leaky building is a thermodynamic failure. It is effectively a conductive resistor being bypassed by convective heat loss.

We have analysed the data from three of our key Melbourne projects: Forrest, Champion, and Pigeon. While they share a similar scientific DNA, their unique site conditions and component selections show exactly how building physics works in the real world.