Brasell Residence Waiarapa

Project Team

Architecture S Naus Architecture for eHaus–
Passive House Design  eHaus–
Construction eHaus Waiarapa–
Certifier MosArt Ltd.–

Passive House Metrics

  • Heating Demand15 kWh/m2/year
  • Heating Load14 W/m2
  • Frequency of Overheating2.7%
  • TFA150.2 m2
  • Form Factor3.61
  • Air leakage @ 50Pa0.6 ACH
  • PE109 kWh/m2/year

Passive House Database 4030

This comfortable, contemporary three-bedroom home is modestly sized and won a 2015 South Pacific Passive House Design Award in the cost-effective category.

The home combines functionality and form, with visual appeal from the street and sympathetic siting toward the south boundary that creates space for gardens and indoor/outdoor flow. The more complex shape means a higher form factor. The mono-pitch roof efficiently sheds the strong Wairarapa winds.

Construction employs ICF walls on top of an insulated concrete slab. Triple-glazed windows are a feature, with this house being the first New Zealand certified Passive House to specify uPVC frames from Energate in Germany. (uPVC construction can meet Passive House standards and it is more affordable than timber or thermally broken aluminium frames with the same performance.)

The house features solar hot water (with an internal storage tank) and a rain water tank. The only heater required is a small freestanding unit.


Construction Details Average Values

  • U-value External Walls0.24 W/(m2K)(R4.2)
  • EcoBlock ICF
  • U-value Floor0.21 W/(m2K)(R4.8)
  • 150mm EPS under slab
  • U-value Roof0.19 W/(m2K)(R5.3)
  • 255mm fibre insulation over Intello
  • U-value Glass0.5 W/(m2K)(R2.0)
  • Energate triple glazing
  • U-Windows0.87 W/(m2K)(R1.1)
  • Energate uPVC
  • Air Control Layer
  • Ecoblock ICF, Concrete Slab, Intello
  • Ventilation Efficiency80%
  • Zehnder ComfoAir350

Images courtesy of eHaus.