Kirribilli
Location
Year Built
Design Style
NSW
2025
The Engineering Beneath the Beauty
Originally approved as a modest three-level extension, this build evolved into a transformative full-scale redevelopment. Along the way, two Development Applications were approved mid-project, enabling a complete reinvention of the property without halting construction.
what we did
We coordinated the excavation of a 50sqm basement beneath an existing terrace home while simultaneously constructing the second and third floors above. The structure required a 20m long, 1.2m high, 500mm deep concrete capping beam, as well as underpinning the neighbouring property. On the other side, a steel-framed cantilevered living space was erected above a shared accessway, supported by 700mm diameter piers drilled 3.5m into sandstone. A suspended slab was poured over an old well, and 172m³ of rock was removed during excavation. The standout feature: a 10sqm western red cedar sauna with microcement walls and a full-height glass face divided by grass, sitting within the basement alongside the custom steel staircase, also designed in-house.
who we used
Design – Kat Lochtenberg, Harmony Haus
Build – Jan Lochtenberg, Varloch
Structural Engineering – Heinz Engineering
Steel Fabrication – SS Design
Excavation – Mona Vale Earthmoving
Basement Waterproofing – Windon Waterproofing
Custom Sauna - Varloch Construction
Microcement Finishing - Macquarie Renderers
Carpentry & Detailing – Varloch, Network/Gioia Tiling,
Joinery - Kitchens By Emanuel & Repose Sydney
Glazing - Everything Glass
Landscapes - Best Mate Scape
