Gale St West Busselton
Residential: Single Dwelling
Passivhaus Plus Certification
West Busselton, WA, 2024
As the first Certified Passivhaus built in the City of Busselton, this project was designed to act as a catalyst for other projects and builders in the area. By inspiring them to adopt the Passivhaus Standard, instead of just meeting minimum requirements of the National Construction Code, this project shows there’s another way; and encourages the future-proofing of local new-build housing stock for impending climate change.
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AIRTIGHTNESS n50 ACH@50pascals: 0.25
HEATING DEMAND (kWh/m².yr): 14
COOLING DEMAND (kWh/m².yr): 0
HEATING LOAD (W/m²): 12
COOLING LOAD (W/m²): 11
PRIMARY ENERGY DEMAND (PE) (kWh/m².yr): 65
PRIMARY ENERGY RENEWABLE DEMAND (PER): 30
PRIMARY ENERGY RENEWABLE GENERATION (PER): 93 -
LOCATION: West Busselton, WA
NCC CLIMATE ZONE: 5 – Warm temperate
NATHERS CLIMATE ZONE: 54
YEAR OF COMPLETION: 2024
TREATED FLOOR AREA (PHPP sqm): 166.2
PROJECT TYPE: New Build
RESIDENTIAL: Single Dwelling
CONSTRUCTION TYPE: Timber Frame
CERTIFICATION LEVEL/ ENERGY STANDARD: Passivhaus Plus -
MHRV SYSTEM: Stiebel Eltron LWZ 180
DOMESTIC HOT WATER SYSTEM: Stiebel Eltron WWK 302 (300L heat pump)
EXTERIOR WALL TYPE, U-VALUE: Timber stud frame, mineral wool cavity insulation, 0.268
FLOOR SLAB TYPE, U-VALUE: Reinforced Concrete (no insulation), 6.97
ROOF INSULATION TYPE, MANUFACTURER: Knauf Earthwool
ROOF CONSTRUCTION: Timber frame
ROOF ENVELOPE U-VALUE: 0.170
WALL FRAME TYPE: Timber stud
GLAZING TYPE, MANUFACTURER, U W-VALUE, G-VALUE, U G-VALUE: Double, ARCO, 1.70 (average), 0.57, 1.39
EXTERNAL DOOR TYPE, MANUFACTURER, U D-VALUE: uPVC with double glazed inserts, ARCO, 1.47 -
NUMBER OF MODULES: 16
HEIGHT, WIDTH OF ONE MODULE (m, m): 1.722m, 1.134m
HEIGHT OF ARRAY: 3.5
EFFICIENCY (%): 98
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The building envelope combines steel, fibre cement and timber building components. The double garage was physically separated from main living space to minimise energy losses (i.e., thermal bridging) between structural components.
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The project team used overheating percentage limit in the PHPP as a minimum guide. Looking to further decrease the % of annual overheating days in their design, as is advisable in a hot climate such as Australia, helps it maintain thermal comfort in the hot summer months. Particular attention was given to shading design.
Project Members
PASSIVHAUS CERTIFIER: Marcus Strang
PASSIVHAUS CONSULTANT/ DEVELOPER / INTERIOR DESIGNER: Ashley Gibson
ARCHITECT/ BUILDING DESIGNER: Luke Kellett
CONTRACTOR / QUANTITY SURVEYOR: Landon Wilde
BUILDER: Wilde Design & Construction
STRUCTURAL ENGINEER: Exeus Structural
PROJECT MANAGER / MECHANICAL ENGINEER / ELECTRICAL ENGINEER / ENVIRONMENTAL CONSULTANT: Ashley Gibson
WINDOW SUPPLIER: ARCO
HRV SUPPLIER: Stiebel Eltron
AIRTIGHTNESS MEMBRANE SUPPLIER: ProClima
INSULATION SUPPLIER: Knauf
ROOFING SUPPLIER: Colorbond
ELECTRICAL CONTRACTOR: Powerlec
BLOWER DOOR TESTER: Gillian Joyner
PHOTOGRAPHER: Landon Wilde