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Hawea Flat Passivhaus

524 Camp Hill Road, Hāwea Flat, New Zealand
524 Camp Hill Road Hāwea Flat Otago 9382 NZ

Inspiration for the conceptual design of the Hawea Flat Passivhaus came from the RIBA award-winning Cat Hill Barn in South Yorkshire, UK.  This sixteenth century, agricultural stone-built barn was sensitively converted into a residence featuring a large double height glass wall to the front, small windows utilising existing openings and feature trusses within a central open vaulted area.

The clients had a love of natural materials and were excited by the opportunity of using German oak for the frame, so it was decided to extend the use of exposed timbers throughout the building. The central open heart of the building features a cathedral like appearance with floating staircase and fink trusses, with the lines of the struts flowing continuously down into the double-height posts. These curved struts also reference 54 curved knee braces joining posts and beams throughout the building.

The frame design is English in style including trusses, a wall plate and supporting posts with a ridge beam and exposed underpurlins in the roof.  Exposed floor beams and joists and a gallery walkway at the back of the grand open vaulted entrance/living area complete the frame design and SIPs (structural insulated panels) wrap around the outside.

The use of Siberian larch 3D profile pre-stained cladding, solid oak flooring, New Zealand made triple glazed windows and doors, mechanical ventilation, shower waste water heat recovery and a large solar PV system with Tesla Powerwall 2 were specified as part of the design of this, New Zealand’s first Passive House Premium building.

Building type:
Single-family residential
Project phase:
Certification type:
Passive House Premium
Year of construction:
Treated floor area:

Team members

Business Role
Rafe Maclean Architect/Designer
Central Otago Builders Contractor/Builder
Rafe Maclean Passive House Designer/Consultant
Jason Quinn Passive House Certifier
CGW Consulting Engineers Structural Engeering
Fantech Ltd MVHR system design and supply
Wanaka Solar Solar PV system Installation

Project suppliers

Suppliers Supplied products
New Zealand Structural Insulated Panels (NZSIP) Ltd. Wall and Roof Panels
Stiebel Eltron Hot Water Heat Pump Cylinder
Thermadura Windows, Doors and Glass Curtain Wall
20/20 Building Supply Group Ltd Membranes and Tapes
Composite Insulation Floor Insulation
Terra Lana Products Limited Service Cavity Insulation