How Much Does It Actually Cost to Build a Certified Passive House in Melbourne?

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.

A certified Passive House in Melbourne built to an architectural standard currently costs between $7,500 and $10,500 per square metre inclusive of GST. That range reflects real projects currently on the ground. It is not a theoretical estimate, and it is not a penalty for building green. It is what high-performance architectural construction costs in inner Melbourne right now.

Why does the cost per square metre vary so much?

Before looking at the numbers, it is critical to understand what is actually driving cost on these projects, because most of it has nothing to do with Passive House performance.

The homes Carland Constructions builds are custom architectural homes. They have exposed timber ceilings, high-end joinery, stone bench tops, architectural flooring, custom cabinetry, feature splashbacks, and bespoke detailing throughout. A kitchen in a current inner Melbourne Carland Constructions project is running between $43,000 and $68,000. Timber-lined raking ceilings over a large living area are adding $44,000 to $48,000 to the project cost. High-specification joinery across the full home can run to $240,000 on a larger brief.

None of that is a Passive House cost. That is an architecture cost. It would appear on the bill regardless of whether the home was pursuing certification or not.

If you stripped the project back to the elements that are specifically attributable to Passive House performance, the genuine cost premium over a standard architectural build is relatively small. The Altereco Design cost comparison study* across 18 projects found a premium of 3.21% for certified Passive House over a high-performance home. That aligns with what Carland Constructions sees in practice. The additional cost sits in the membrane system, the upgraded insulation specification, the window upgrade from double to triple glazing, the airtightness testing, and the certification process itself. Those are real costs. They are not enormous costs relative to the total project.

The reason the overall build cost looks high is that the clients who build certified Passive Houses with Carland Constructions are not building basic homes. They are building the last home they will ever build, and they are specifying it accordingly. The performance standard and the architectural ambition arrive together.

What about the cost of the mechanical ventilation system?

The heat recovery ventilation system is the one Passive House-specific cost that draws the most attention. A correctly specified and installed system in a current inner Melbourne project is running between $26,780 and $33,750 inclusive of GST. That is a real number and it is worth being transparent about.

What is also worth being transparent about is what it replaces.

A standard architectural home trying to achieve genuine comfort in Melbourne's climate needs a ducted reverse cycle system, often supplemented by a hydronic heating system, a fireplace, or zone-controlled split systems in rooms that the ducted system cannot adequately serve. Price those properly and you are looking at $30,000 to $50,000 in heating and cooling infrastructure, ongoing maintenance, ongoing filter replacement, and ongoing energy cost.

The Passive House with heat recovery ventilation does not need all of that. The envelope does so much of the heavy lifting, keeping heat in during winter and out during summer, that the supplementary heating and cooling load is minimal. The MVHR system provides continuous filtered fresh air as a baseline function, and the small amount of active heating or cooling required can be delivered through the ventilation system itself or a single modest split system. The $27,000 to $34,000 installation cost needs to be weighed against $30,000 or more in complex heating and cooling systems that a standard build of equivalent comfort aspiration would require. The net cost difference is significantly smaller than the headline figure suggests, and the Passive House system runs at a fraction of the ongoing energy cost.

What does the current market actually say about cost per square metre?

Pulling from current Carland Constructions projects and preconstruction estimates across inner Melbourne:

A double-storey certified Passive House of approximately 171 m², high complexity, custom materials, demolition included, Passive House mechanical systems, Pro Clima airtightness, and high-specification finishes is currently estimated at $1.67 million to $1.80 million inclusive of GST. That is approximately $9,800 to $10,500 per square metre.

A single-storey certified Passive House of approximately 233 m², high-specification fixtures, recycled face brick, heat recovery ventilation, no demolition, 16-month programme is currently estimated at $1.35 million to $1.43 million inclusive of GST. That is approximately $5,800 to $6,200 per square metre.

A double-storey certified Passive House of approximately 294 m², architectural raked and timber-lined ceilings, high-end joinery, heat recovery ventilation, Pro Clima membranes, complex roofline, is estimated at $2.32 million to $2.49 million inclusive of GST. That is approximately $7,900 to $8,500 per square metre.

Two projects currently on site are running at $1.4 million for approximately 180 m² and $1.75 million for approximately 220 m², or roughly $7,800 and $8,000 per square metre respectively.

The realistic range for a certified Passive House in inner Melbourne with architectural specification is $7,500 to $10,500 per square metre inclusive of GST. Carland Constructions has also delivered projects below this range, where clients made different choices on cladding, joinery, and finishes. The performance of the building does not change when you choose a simpler cladding system or a more restrained joinery package. The envelope, the membrane, the windows, and the ventilation system remain. The architectural decisions around them are the client's to make.

What actually drives cost up or down within that range?

Size. Fixed costs are spread across more square metres on a larger home. A 160 m² home will always cost more per square metre than a 280 m² home with equivalent specification. This is true of all construction, not just Passive House.

Storeys. Double-storey construction costs more per square metre than single-storey due to scaffolding, upper-level floor systems, staircase, and the additional complexity of maintaining a continuous airtight layer across the floor junction between levels.

Roofline complexity. A simple single-pitch roof is significantly cheaper to build and seal than a home with multiple roofline changes, raked ceilings, and complex junctions. Every junction in a Passive House has to be detailed, sealed, and verified. More junctions means more cost.

Client selections. Cladding choice alone can move the project cost substantially. Colorbond wall cladding, recycled face brick, and custom timber cladding all carry different price points. The same is true of flooring, joinery, benchtops, fixtures, and appliances. Carland Constructions has brought projects in below the typical range by working with clients who made deliberately restrained choices on finishes. The building performs identically.

Site conditions. A simple square metre rate does not capture what lies beneath the surface. On a constrained inner Melbourne site, geotechnical conditions can vary dramatically from one block to the next. A site requiring screw piles drilled to 9 metres due to poor soil bearing capacity adds significant cost before a single wall goes up. A sloped site may require retaining walls, pumping systems, and engineered drainage to manage water at the perimeter. A tight inner-city block with limited access for cranes and materials deliveries adds time and coordination cost that does not appear in a per-square-metre rate. These are site realities, not Passive House costs, but they affect the total budget for any build on that site.

Why has the volume home become the benchmark for what a house should cost?

This is the question that rarely gets asked directly, and it should.

The volume home industry has spent 40 years optimising for one thing: the lowest possible construction cost that still meets the minimum legal standard. The National Construction Code sets a floor for building performance, not a target. Anything below it is illegal. Anything above it is optional. Volume builders build to the floor because that is where the margin is.

The result is that an entire generation of Australians has come to believe that a home costing $2,500 to $4,000 per square metre is normal, reasonable, and sufficient. It is legally sufficient. It is not thermally sufficient, acoustically sufficient, or health-sufficient by any measure that matters to the people living inside it.

According to research cited in Australian residential building performance literature, 50% of Australian buildings have mould issues. The WHO ranks Australian homes among the coldest in the developed world relative to outdoor temperatures. Over 70% of Australian homes were built before 2000 (Australian Bureau of Statistics), before modern airtightness or energy performance requirements existed in any meaningful form.

The volume home is the benchmark because the industry made it the benchmark. It is not the benchmark because it represents good value, good performance, or good design. It represents the minimum that the law requires, and the law is embarrassingly behind where it should be.

A certified Passive House costs more than a volume home because it is a fundamentally different product. Comparing their prices per square metre is like comparing the cost of a bespoke tailored suit to a mass-produced one hanging on a rack. They are both technically clothing. The similarity ends there.

What does this mean for your budget?

If you are planning a custom architectural home in Melbourne's inner suburbs and you are thinking seriously about certified Passive House construction, the honest starting point is $8,000 per square metre for a double-storey build with a standard architectural specification. Complex rooflines, architectural ceiling treatments, and premium joinery will push that higher. Simpler cladding, restrained finishes, and straightforward forms will bring it lower.

Add site-specific costs before construction starts. Geotechnical investigation, demolition, tree removal, and council fees are project costs that exist regardless of what you are building. They are not a Passive House premium.

Then consider what you are not spending. You are not spending $30,000 to $50,000 on hydronic heating, complex ducted systems, and supplementary split systems to achieve a home that is comfortable year-round. You are not spending the difference in energy bills every quarter for the next 30 years. You are not spending the cost of remediating mould and moisture damage that a standard build, without proper vapour management and airtightness, is statistically likely to develop over time.

The certified Passive House is not cheap, but neither is any architectural home. It was never meant to be. It is meant to be the last home you ever need to build, performing the way it was designed, tested, verified, and living up to that promise every single day. To be fair, I think we are very well placed to be able to comment on this, maybe more than most. We have built 5 certified passive houses, have two more onsite now, and have 4 projects starting in the next 12 months that will be certified.

*Altereco Design (2026). How Much Does a Passive House Cost in 2026? According to Altereco Design's published cost analysis across their project portfolio, the average cost premium for a certified Passive House over a high-performance home is 3.21% (Altereco Design, 2026). It is worth noting that Altereco's baseline high-performance home already significantly exceeds the minimum NCC standard, meaning the gap between a certified Passive House and a standard volume build is considerably larger than this figure suggests.

**Passipedia — the Passive House Institute's knowledge base The global technical authority. Passipedia cites international research consistently finding a 0 to 8% cost premium for Passive House over standard construction depending on building type, size, and climate zone.