Tan leather seating and a sculptural fireplace in Killaras sunken lounge. Photo Christine Francis.

This seating arrangement aims to bring the a busy, multi-generational family occupants together. Photo Christine Francis.

Floor-to-ceiling windows invite light into the new living and dining space. Photo Christine Francis.

All cabinetry in the home is made from timber. Photo Christine Francis.

The upper-storey extension facade features a reflective stainless-steel finish. Photo Christine Francis.

When this stately 1850s house in Windsor was purchased at auction, it was effectively saved from developers who were keen to demolish it. Recognising this potential fate, the owners engaged Junctions90 to renovate the home in a manner so enduring that its legacy and significance would never again be questioned.

The project presented an opportunity to marry the existing period architecture with superb 21st century living requirements. The clients required enough space to accommodate a home business, and bedrooms for multiple generations under the one roof.

Restoring the original rooms of the house was the first order of business. All the fireplaces and plasterwork needed replacing, with local craftspeople engaged to create replicas, including one of a 160-year-old ceiling rose. The floorplan remained unchanged except for one room transformed into a walk-in wardrobe.

A voluminous two-storey extension was added, inspired by the extreme clarity and simplicity ofGerman-American architect LudwigMies van der Rohes work. Bleached white polished concrete floors and a suspended concrete roof give the space durability, complemented by an understated palette of walnut, white and black. The approach to the materials selectionconcrete, steel and glasswas based on the idea that these timeless materials and clean aesthetic would reduce obsolescence. Occupants can update furniture, but they dont need to update the building fabric, says DinaMalathounis, principal of Junctions90.

The interior highlight of the extension is the sunken lounge surrounding a sculptural hanging fireplace. While based on popular lounges from the 1960s, this seating arrangement fulfils the very modern purpose of bringing a busy family together.

A further standout element of this project is the upper-storey rear facade featuring areflective stainless-steel finish. Dinas vision was for this facade to appear almost invisible, concealing the 21st century features inside.

Killara has certainly achieved its design intent, taking out a handful of awards in the process. The sunken lounge living room was named Room of the year by Australian House & Garden magazine, and Dina became the first female lead designer to win the BDAV Building Design of the Year in its 22-year existence.