Lake Tarawera House Rotorua

Project Team

Architecture & Passive House Design TAWA architecture Ltd–
Structural Engineer
Certifier Sustainable Engineering Ltd –

This is a two storey bach over-looking the Lake. It is designed as a low-maintenance durable house, that has been integrated into the landscape with material selection and texture designed into the facades. The house takes advantage of the solar aspect and view to combine to a well-designed, private get away.

Passive House Metrics

  • Heating Demand19.6 kWh/m2/year
  • Heating Load14.3 W/m2
  • Frequency of Overheating2%
  • TFA122.1 m2
  • Form Factor3.4
  • Air leakage @ 50Pa0.61 ACH/hour
  • PER demand72 kWh/m2/year
  • Renewable Generation 61 kWh/m2/year

Passive House Database -None-

Construction Details Average Values

  • U-value External Walls0.28 W/(m2K)
  • Insulated Concrete Form (ICF) Ecoblock walls
  • U-value Floor0.26 W/(m2K)
  • 100mm XPS
  • U-value Roof0.17 W/(m2K)
  • Truss roof with Intello and Earthwool Glasswool batts
  • U-value Glass1.12 W/(m2K)
  • PlaniTherm Ultra N double glazing
  • U-Windows1.34 W/(m2K)
  • Timber with aluminium cladding 
  • Ventilation Efficiency81.10%
  • Zehnder  ComfoAir350