When people think of building new homes, one of the first questions is: how much will it cost if I want it to be high-performance or Passivhaus (Passive House) standard? It’s a great question, and while there's no one-size-fits-all answer, knowing what drives costs, and what you get in return, will help you budget smarter and aim for a home that’s as comfortable, efficient, and future-safe as it is beautiful.

At TERRA!, we believe a new home should be more than four walls. It should perform well in every season, breathe well, use energy lightly, and support your health and lifestyle. Here’s what to expect, and what goes into the numbers.

What Drives the Cost of a High-Performance / Passive House

There are several key factors that tend to increase costs compared to a “standard” new home. Understanding these helps avoid surprises.

How Much More Does Passive / High-Performance Cost?

Here are some ranges and insights (Victoria / Australia) to guide expectations. These are indicative only — your project may fall above or below depending on the factors above.

• Recent studies found that new build Passive Houses averaged around AUD 6,500/m², while high performance homes (slightly less stringent but still well beyond code) averaged about AUD 5,500/m².

• Many sources agree that building to Passive House standard tends to carry a premium of about 10-15% over a quality custom or high-performance build.

• Entry-level or basic Passive Houses in Victoria can start lower (for example, simpler forms, smaller homes, more basic finishes), but the cost for a fully featured Passive House will sit toward the higher end of the range.

What You Get in Return

Spending more upfront can feel risky, but the returns are often substantial:

• Much lower energy bills — for heating, cooling and ventilation. Passive Houses can reduce those loads dramatically.

• More comfort and health — stable indoor temperatures, better air quality, fewer drafts, less condensation that leads to significantly lower risk of mold formation.

• Higher long-term value — energy-efficient homes, especially those delivering measurable performance, are increasingly attractive to buyers.

• Lower maintenance / operating risk — because less reliance on mechanical systems for heating/cooling; better building envelope means fewer problems like moisture or thermal bridging.

The Benefits of Modelling Your Project in PHPP

Modelling a project in PHPP (Passive House Planning Package) provides a data-driven understanding of how your home will perform long before construction begins. It allows the design team to simulate energy use, thermal comfort, overheating risk, and ventilation balance, giving you confidence that every design decision—window placement, insulation level, shading strategy—contributes to measurable performance. PHPP helps optimise the design early, reducing costly changes later, and ensures your home achieves exceptional comfort and efficiency, not just on paper but in real life.

The Benefits of Passivhaus Certification

Achieving Passivhaus certification takes that performance one step further. Certification is an independent quality assurance process that verifies your home meets globally recognised standards for energy efficiency, comfort, and airtightness. It ensures the design intent is fully realised during construction through testing, documentation, and review by a certified body. For homeowners, it provides peace of mind that the investment truly delivers what was promised—superior comfort, ultra-low running costs, and proven building quality. It also adds credibility and long-term value to your property as awareness of certified performance homes continues to grow in Australia.

Example: What a Typical Build Could Look Like

Here’s a rough illustrative scenario (your project may differ significantly):

• Home size: 200 m²

• Fully designed Passive House standard: high insulation, high performance glazing, ventilation with heat recovery, good orientation, well-resolved thermal envelope, finishes of good quality (but not ultra-luxury)

• Site is relatively straightforward (no extreme slope, easy access)

In this kind of scenario, you might expect a build cost toward the higher end of the Passive House range above (AUD ~6,000/m²), plus:

• Professional fees (architect, engineer, certifier, consultants) ~10-15%

• Permits, approvals, perhaps specialist reporting

• A contingency (10-15%) to cover unexpected site issues or material/trade variances

So, total cost might end up being significantly above the baseline of a standard custom home, but the long-term running and comfort benefits typically offset that over time.

How to Budget Your Project (Tips)

• Start with making the building envelope (insulation, windows, orientation, airtightness) a priority — the more you can get correct early, the more value you’ll have.

• Simplify your form where possible: compact shapes are cheaper to build well.

• Choose reliable trades experienced with performance work, mistakes in insulation/airtightness are expensive to fix later.

• Get quotes including all hidden costs: site prep, certification, consultant fees, energy modelling, testing.

• Include contingency from the start.

• Get a builder on board from the start to provide estimates and keep budget under control.

Why Terra Is a Good Partner for High-Performance / Passive Design

At Terra, we bring together:

• Expertise in performance design and building science

• Relationships with certifiers and consultants so you get clear numbers early

• A focus on making performance beautiful and liveable

• Transparent communication about cost influences and trade-offs

Let’s Talk: Free Site Visit & Estimate

If you’re considering building a high-performance or Passive House in Victoria, we’d love to help you see what it might cost for your site, your design, your priorities. We offer a free initial site visit and consultation to unpack what matters most and help you make decisions that balance cost, comfort, and long-term value.