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Whanganui District Yoga Forme Studio Non-certified, eHaus Euro, Passive House Enerphit


The brief from this client was to 'convert an old automotive garage into a Wellness Centre and Yoga studio' - complete with a cafe at the front. They wanted a quiet, healthy space that was warm all year round for their customers, so the PHI EnerPHit option was the natural approach. EnerPHit is the established standard for refurbishment of existing buildings using the Passive House approach and PHPP energy modelling tool. The Passive House Standard often cannot be feasibly achieved in older buildings due to various difficulties. Refurbishment to the EnerPHit Standard using Passive House components for all relevant structural elements in such buildings leads to extensive improvements with respect to thermal comfort, structural integrity, cost-effectiveness and energy requirements. Despite the slightly higher energy demand, it offers vmost of the advantages of the Passive House standard. The final result is a beautiful space enjoyed by many right in the heart of Whanganui city. The cafe (previously called the Petre dish) is now fine dining and vegan friendly. The Greenhouse Aotearoa is all about 'changing the health stats in New Zealand by encouraging good eating'. Health is at the forefront of this business which fits perfectly into the health and comfort this low energy building provides.

Extraordinary heat energy savings.

Every one of our projects are energy modelled using the Passive House Planning Package (PHPP). It's through this powerfully clever tool that we can accurately calculate just how much heat energy every eHaus will save when compared to a similarly- sized typical new home, built in the same climate region.

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This project is making significant carbon savings for a better environment.

We believe that our homes should have a big impact on the way we live, but little impact on the land. We've calculated the amount of carbon our homes have saved through energy efficiency from move in day 'til now. At their core, eHaus' are built with the elimination of carbon emissions in mind - so we're not only creating healthy, comfy & high performing homes, but spaces that don't cost the earth.

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Meet the team of designers and builders behind this project

Our eHaus team is made up of some of the country's best Passive House builders, architects and designers who are redefining the way kiwis live one home at a time. Our team of professionals work together to see your dreams come to reality.
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Design Components

ecoBlock ICF wall U-value of 0.262 W/(m²K)
Double layer of fibreglass insulation U-value of 0.213 W/(m²K)
Window Joinery Frame
Thermally Broken Aluminium Uf value 4.15 W/(m²K)
Double Glazed Low E Argon Ug value 1.20 W/(m²K) G Value 62%
2 x AER 500 MHRV units
Hot Water
Hot water heat pump split system with internal 300 litre water storage
Hydronic underfloor system powered by not water heat pump
Fully insulated concrete pad with a U-value of 0.24 W/(m²K)

Performance Specs

Heating Demand: 23.9 kWhy/m²/yr
Heating Load: 16.7 W/m²
Frequency of Overheating: 4%
TFA: 292.8 m²
Form Factor: 3.39
Air Leakage@50Pa: 0.45 ach
Primary Energy Requirement: 70 kWh/m²/yr


eHaus - Jon Iliffe



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