Whanganui District – Roxborough

In by Harry Iliffe

Whanganui District – Roxborough

eHaus Euro - Certified Passive House Classic

It’s remarkable how much fits inside this two-storey 151 m2 home for an extended and expanding family. The clients wanted a functional and compact home, a place that was both dignified and comfortable. It also includes a self-contained flat, gym, library and 3.5 bathrooms

“Without a doubt the most comfortable house we’ve ever lived in, year-round and without having to burn power to make it that way, which is awesome”

Design Components

Floor – Fully insulated concrete pad with a U-value of 0.238 W/(m²K)

Wall – ecoBlock ICF wall  U-value of 0.096 W/(m²K)

Roof – Double layer of fibreglass insulation U-value of 0.205 W/(m²K)

Window Joinery Frame – Hilzinger, KBE Prestige Upvc Uf value 1.53 W/(m²K)

Glazing – Double Glazed Low E Argon Ug value 1.10 W/(m²K) G Value 62%

Ventilation – Zehnder Comfo Air 350 MHRV

Hot Water – Flat plate solar system with internal 300 litre water storage

Heating/Cooling – Inline heating element incorporated into ventilation system and controlled by comfo ease panel

Power generation – 5 kW Solar PV system

Ecological features  – 2 x 22,500 litre water harvesting system. Natural flow black and grey water treatment system with composting. Clothes drying cupboard integrated into the ventilation system

Performance Specifications

Floor Area: 151m2

Heating demand: 11.0 kWh/m2/annum
this compares to minimum compliance 6 Star house at approx. 50 kWh/m2 per annum

Heating Load: 10 W/m2

Frequency of Overheating: 0%

TFA: 151.3 m2

Form Factor: 3.06

Air Leakage@50Pa: 0.6 ACH

PE demand: 100kWh/m2/yr

Experience this eHaus for yourself

Contact eHaus Whanganui District

Passive House Project Team


Black Pine Architects - Duncan Sinclair


eHaus Whanganui District


eHaus - Cyril Vilbert