Carthona House is a heritage listed Federation home set on a corner block in the Sydney harbourside suburb of Mosman. To accommodate a growing family, the owners engaged Daniel Boddam architects to design a home that was functional, warm and catered to their lifestyle.

The design aesthetic was for the heritage style front of the property to be retained, and contrasted against the charred timber of the extension.

The courtyard between the original house and new extension is a unique feature of the design. The beauty about the courtyard is that as well as being the link from the old to the new, it can be private and secluded or opened up to the elements giving an outdoor feel to the space.

The original house has kept its character with black Japan timber flooring, high skirtings, ornate cornices, timber windows with a high level of craftmanship and finish. In contrast, the new wing is marble floors, bagged brickwork, Gyproc ceilings, aluminium doors and windows and charred timber clad to give a crisp clean modern finish.