The design is well considered in all aspects of orientation to provide a passive interior environment for all seasons with appropriate sun mitigation and cross ventilation.
The northern elevation is the active interface with the exterior environment and includes overhangs, eyebrows, and pockets to achieve appropriate sun angles, shade, shelter and ventilation.
Roof water is collected so the gutter design is a key element of the side elevation to still achieve a flush wrapping of the roof and walls in one.
Sensitively altering and adding to an existing house and preserving almost all of the old is the ultimate design decision for sustainability.
The predominant sustainability decision was to keep the wall and weatherboards on the eastern elevation and as much of the original as possible.
The existing house is already 80 years old and proximity and exposure to the sea and maintenance of material was a key driver in the decision to clad the roof and sides in aluminium as was painting of the timber rather than staining and oiling.
Both aluminium and timber can be repurposed, although the intended life cycle is likely to be more than 50 years.
All rainwater is collected and filtered for drinking and household use while wastewater is treated on site.
Cooling is all passive while heating includes a gas fire for boosting in mid winter – plus winter solar gain is achieved and insulation has been added to the original house.
Minimal concrete has been used just in new foundations and original weatherboards have been reused where possible.