eHaus Parthenay Whanganui

Project Team

Architecture & Passive House Design eHausCad Viz– /
Interior Design Terry Lobb –
Builder eHaus – Baden Brown & Craig Alderton
Engineering Peter van Grinsven –
Certifier Sustainable Engineering Ltd –

Striking family home with no windows to the south side of the building which is metal clad and faces the road. The southerly facade blends into the rural setting but the home opens up to impressive views of Ruhapehu to the north.

Designed and built for his own family. First Certified Passive House Plus in Australasia. Original certification by Mosart in Ireland.

The simple form was designed for maximum energy efficiency but also  construction simplicity. Designed and sized to match the Ecoblock wall system with minimum waste. Concrete slab on EPS insulation. Roof insulated with fibreglass batts over Intello Airtightness layer.

Performance has been monitored, the information gathered was presented as a paper at the International Passive House Conference in 2017 by Pricila Besen. The home is also featured in the Australaisin Book Positive Energy Homes.  The home provides excellent year round comfort including the summer months with no active cooling required. This has been achieved in part with small glazing to the East and West and well sized overhangs to the North.

Passive House Metrics

  • Heating Demand6.2 kWh/m2/year
  • Heating Load9 W/m2
  • Frequency of Overheating0%
  • TFA134.5 m2
  • Form Factor2.9
  • Air leakage @ 50Pa0.47 ACH/hour
  • PER demand33 kWh/m2/year
  • Renewable Energy Generation45 kWh/m2/year

Passive House Database 4369

Construction Details Average Values

  • U-value External Walls0.26 W/(m2K)
  • Rockcote Plaster System
  • U-value Floor0.24 W/(m2K)
  • -
  • U-value Roof0.14 W/(m2K)
  • -
  • U-value Glass1.20 W/(m2K)
  • Double Nutralux 
  • U-Windows1.51 W/(m2K)
  • Eco Windows Alu/wood
  • Ventilation Efficiency81%
  • Zehnder - ComfoAir350