"In terms of efficiency, we couldn't beat the original villa layout, with its central axis and rooms off to the left and right. These bedrooms receive plenty of natural light, and there is a direct circulation route from the front door to the living areas at the rear.
"But we did take the opportunity to make one key change there is a subtle, gradual rise in the hallway ceiling height towards the rear. This helps to lead the eye to the extension, which explodes open with a much higher ceiling that follows the new, gabled roof line."
Holmes says the new addition steps in briefly from the sides of the original house, and is also stepped down, so it reads as a separate volume. The traditional weather-boards of the old villa can be glimpsed through two slot windows at the sides.
Exposed dark-stained beams and cedar sarking in the living area also signal a change in architecture, and the break between old and new.
"Even from the outside, the broader, wider gabled roof makes it clear that this is a modern addition," Holmes says.
To bring additional natural light into the family space, a large circular skylight was added.
"With close neighbours on two sides, it didn't make much sense to put windows in the side walls. The skylight brings in plenty of light. The ceiling is such a strong design element we initially wondered whether we should interrupt it to create the skylight.
"But to remove the rafters would have involved a lot of extra engineering, so we continued them right across the skylight. The result has been very pleasing they add visual appeal and cast interesting shadows as the position of the sun changes during the day."