Passive House

Kasumi Architecture interior — quiet residential work designed with Passivhaus principles, by Certified Passive House Designer Yusuke Shiratori

Passive House —
Design & Consultancy in Melbourne & the Yarra Valley


Concept

A Passive House (Passivhaus) is a building designed to remain comfortable in every season while using a fraction of the energy of a conventional home. It's the world's most rigorous low-energy building standard, developed in Germany and adapted carefully for Australian climates.

In practice, a Passive House feels different the moment you step inside: even temperatures, fresh filtered air, and a stillness that comes from a well-sealed envelope. There is no harsh summer heat, no winter draughts, and very little need to run heating or cooling at all.

For owners, that means dramatically lower running costs, healthier indoor air, and a home that ages gracefully.

We design to the Passivhaus standard — not as a label, but as a discipline: every detail considered, every assumption tested, every joint detailed before it leaves the studio.

Services

Full Design Service

・ Full Design Service

End-to-end architectural services for new homes, renovations, and extensions, designed to the Passivhaus standard — from site analysis and PHPP modelling through documentation, builder coordination, and contract administration.

Best for: owners who value craft, comfort, and a single relationship through the project.

Existing Home Consultancy

・ Existing Home Consultancy

For owners curious whether their existing house can be brought toward Passive House performance — without committing to a full rebuild. We assess the home as it stands, model its current performance, and present clear scenarios with the tradeoffs spelled out: upgraded windows and doors, improved thermal envelope, airtightness work, ventilation strategy.

You leave with a realistic picture of what's possible, what each scenario costs and delivers, and where to start.

Best for: owners of an existing home considering renovation or upgrade, who want a clear-eyed feasibility view before committing to changes.

FAQ

Does Passive House cost more to build?

A Passive House typically costs a little more upfront — often in the order of 10–20% over a conventional well-built home — and pays that back over time in dramatically lower energy bills, longer-lasting building fabric, and a home that needs almost no replacement of mechanical systems.


How long does a Passive House project take?

Comparable to any thoughtfully designed home. Design typically runs 8–15 months; construction depends on scale and builder, but is often 8–12 months. We build energy and comfort modelling into the design phase, so the standard is decided early, not retrofitted late.


Can I engage you only for consultancy, without full design?

Yes. Many owners come to us for an Existing Home Consultancy — an assessment of their current house and a set of modelled upgrade scenarios with the home alteration and extension ideas— without committing to a full design appointment. You can take the report away and decide where to go next, at your own pace.


Can an existing house be made into a Passive House?

A formally certified Passive House retrofit ("EnerPHit") is possible but demanding. More commonly, we help owners move existing homes substantially toward Passive House performance — improving comfort, air quality, and energy use without insisting on full certification.


Can a Passive House be built in bushfire-prone areas?

Yes. Passive House principles and BAL (Bushfire Attack Level) compliance work well together — both prioritise robust building envelopes, careful detailing, and well-considered materials. We routinely design for the bushfire zones common across the Yarra Valley and regional Victoria.


What areas do you work in?

We're based in Warburton in the Yarra Valley and work across the Yarra Ranges, Cardinia, greater Melbourne, and regional Victoria. Distance is not usually a barrier for design work; it's a conversation we'll have early about the right local team to deliver the build.

Testimonials

“ We are truly thrilled with Yusuke's hard work and dedication. The result being the fulfilment of our dreams and a beautiful home. ”

Carole & Terry, Wayfarer

Testimonials

“ We are truly thrilled with Yusuke's hard work and dedication. The result being the fulfilment of our dreams and a beautiful home. ”

Carole & Terry, Wayfarer

Testimonials

“ We are truly thrilled with Yusuke's hard work and dedication. The result being the fulfilment of our dreams and a beautiful home. ”

Carole & Terry, Wayfarer