At Sirius Cove, a Quiet Composition

Where light leads

At 9 Sirius Avenue, a contemporary residence has taken its place in that landscape — private, materially rich and designed around the pleasure of living close to the water.

In the 1890s, Arthur Streeton and Tom Roberts painted from the shores of Little Sirius Cove, drawn to a pocket of Sydney Harbour that felt both secluded and alive with light. More than a century later, that same foreshore remains one of Mosman’s most quietly compelling settings.

9 Sirius Avenue sits on a 1,031-square-metre parcel at the quiet end of a cul-de-sac leading toward Sirius Cove Reserve. With interiors and façade design by Sydney studio Sici Design, the residence unfolds across three levels with five bedroom suites, six bathrooms, a four-car showroom garage with internal turntable, lift access to every floor and a lower level dedicated entirely to leisure. An exclusive right-of-way extends from the property toward the cove.

Minimal, Never Modest

Stone, timber and restraint. Principal living space showing travertine, sculpted stone, oak detailing and natural light.

What registers first is not scale, although the home is substantial. It is control. Travertine, sculpted stone and oak are used with precision, creating interiors that feel rich without becoming ornate. The main kitchen is anchored by a monolithic island, with the butler’s pantry and industrial-sized cool room extending the home’s capacity for serious entertaining without disturbing the visual calm of the living spaces.

Even the boldest material moments are handled with restraint. Stone turns corners cleanly. Joinery appears built into the architecture rather than applied to it. Light moves across each surface with intention. The effect is not minimalism, but confidence — a home that understands that lasting luxury is rarely the loudest thing in the room.

A floor, devoted

A home designed to stay in. Poolside leisure level with infinity pool, outdoor cinema and fire pit lounge in frame.

The most distinctive planning decision at 9 Sirius is the choice to give leisure its own level. The lower floor opens onto an illuminated infinity pool, landscaped garden, built-in fire pit lounge and outdoor cinema — not as separate indulgences, but as one continuous setting for long afternoons, private gatherings and evenings that have no reason to move elsewhere.

Inside, the same level extends into a private wellness and entertainment retreat: gym, sauna, steam room, hot and cold plunge baths, a soundproofed cinema room and a temperature-controlled wine cellar behind glass. Together, they give the residence a rare completeness. This is not simply a large home with a long list of inclusions; it is a home designed around how its owners may genuinely choose to spend their time.

Enclave by nature

The quiet pull of Sirius Cove

Sirius Cove has always held a particular kind of appeal. Sheltered by sandstone edges and bushland, the foreshore feels removed from the pace of the city while remaining unmistakably connected to the harbour. The beach, reserve and walking tracks sit moments from the property, with the Curlew Camp Artists’ Walk tracing the same Little Sirius Cove landscape that drew Streeton, Roberts and their contemporaries more than a century ago.

That setting matters to the way the home is experienced. The street is quiet, the approach discreet and the water never feels far away. Mosman’s village precincts, harbour parklands and cultural landmarks remain close at hand, yet 9 Sirius Avenue holds onto something rarer: the sense of living inside a private enclave, shaped by nature as much as architecture.

• Tri-level residence on a 1,031m² site at the quiet end of a Mosman cul-de-sac

• Interiors and façade design by Sici Design

• Five bedroom suites and six bathrooms

• Lift access across all levels

• Principal suite with couple’s ensuite, designer dressing room and balcony aspect

• Gourmet kitchen with monolithic island, butler’s pantry and industrial-sized cool room

• Dedicated wellness suite with gym, sauna, steam room and hot and cold plunge baths

• Soundproofed cinema room and temperature-controlled wine cellar

• Illuminated infinity pool, landscaped entertaining zone, fire pit lounge and outdoor cinema

• Four-car showroom garage with internal turntable

• Comprehensive home automation

• Exclusive right-of-way access toward Sirius Cove