Introduction
Choosing between Mainsail Avenue and Sirius Street is a choice between two ways to live on the same island. Both are established residential streets inside St Huberts Island’s quiet canal estate on Brisbane Water, sharing the same shops, schools and waterways. Where they differ is block size, home style and price. This guide walks through both streets side by side, then answers the questions buyers and renters type into a search box.
A Shared Island Lifestyle
Start with what the two streets share, because it is most of the picture. St Huberts Island is a canal-laced residential estate of about 2.7 square kilometres, developed from the mid-1970s, where private jetties and pontoons are common rather than the exception. Boating, kayaking, stand-up paddleboarding, fishing and swimming on Brisbane Water shape the everyday rhythm, with boating access through to Saratoga, Davistown and Broken Bay.
The island counts about 1,080 residents and an average of 2.3 people per household, with an owner-occupied share of 87.3 per cent. Residents describe the suburb as clean, green and neighbourly.
Both streets sit about five minutes’ drive from Ettalong Beach, Umina and Woy Woy for cafés, restaurants and the weekend Ettalong markets. Woy Woy station is roughly a ten-minute drive with direct rail to Sydney, and the ferry from Ettalong Wharf to Palm Beach runs about 35 minutes. A single bridge at Daleys Point connects the island to the mainland, so the commute works the same from either street.
Streetscape and Block Sizes
The clearest difference is block size and street scale. Mainsail Avenue is the more established street, with observed lots mostly in the mid-600s square metres, from about 648 square metres to 696 square metres. Homes here mix three to five bedrooms and two to four bathrooms, from mid-century builds through to substantial modern waterfront rebuilds.
Sirius Street is a compact street of just 11 houses, and it is about 80 per cent owner-occupied with 20 per cent rented. Its lots run larger, from about 696 square metres to 883 square metres. The typical home is four bedrooms, two bathrooms and two car spaces, with single-level brick and tile common.
Mainsail Avenue tends to give you more home on a tighter block, while Sirius Street gives you a bigger block on a shorter, quieter street.
Recent Sales and Price Bands
For context, the island’s median house price sits at $1.9 million, with long-term price movement up 108.48 per cent, a five-year median value increase of 19.72 per cent and buyer demand up 11 per cent over the same period.
Mainsail Avenue’s recent detached sales cluster from about $1.97 million to $2.3 million. 25 Mainsail Avenue sold for $1.97 million in April 2025. 18 Mainsail Avenue reached $2 million in November 2022, and 33 Mainsail Avenue matched that at $2 million in February 2026. At the top end, 11 Mainsail Avenue, a wide-canal waterfront home, sold for $2.3 million. The same property is now estimated at about $2.43 million, following a listing guide of $2.6 million to $2.7 million.
Sirius Street’s sales sit in a more approachable band, around $1.35 million to $1.68 million. 15 Sirius Street, a single-level brick and tile home, sold for $1.35 million in May 2026, and 10 Sirius Street, a deep-waterfront home with a jetty, sold for $1,675,400 in January 2026. Earlier, 13 Sirius Street sold for $1.5 million in 2021. Looking forward, 10 Sirius Street is currently guided at $1,525,000 to $1,575,000, and 11 Sirius Street, a four-bedroom home with an oversized master suite, is on the market now.
Different home sizes, eras and outlooks sit behind these numbers. There is no single authoritative, same-date street median for either street, so treat these as indicative bands rather than a matched pair.
Schools and Everyday Access
Both streets fall in the same catchment: Empire Bay Public School for primary and Brisbane Water Secondary College Umina Campus for secondary. Empire Bay Public School carries an ICSEA of 1,039, while the Umina campus sits at 966. The difference is how close the everyday options feel.
From Mainsail Avenue, Empire Bay Public School is about a 16-minute walk, while the Umina campus is around an 11-minute drive. From Sirius Street the catchment schools are a short drive, with Empire Bay Public about six minutes and the Umina campus about ten minutes.
Sirius Street’s edge is walkability. Woy Woy Public School is about a 13-minute walk, Brisbane Water Secondary College Woy Woy Campus about 17 minutes and Brisbania Public School about 19 minutes. Private options including Coast Christian School, St Edwards College and Central Coast Grammar School sit a short trip from both streets.
Water Outlook and Street Character
Waterfront living runs through both streets, but the outlook changes address to address rather than street by street. On Mainsail Avenue, number 11 has wide canal frontage with a sunny northerly aspect and a new jetty, mooring pole and slipway. Number 33 sits on a sheltered sandy inlet with private beach access. Shelter Cove is a recurring outlook along the street: 12 Mainsail Avenue, for instance, sits on the cove with uninterrupted views across to Daleys Point.
On Sirius Street, number 10 is documented with deep waterfront, a jetty, an inground pool and outdoor entertaining. Around it, 15 Sirius Street offers a water-first everyday where kayaking, boating and fishing are all within easy reach. Both streets stay low-rise and built to make the most of the water. Mainsail skews to substantial multi-level waterfront homes, while Sirius reads as a tight, neighbourly street of comfortable family homes.
Conclusion
Mainsail Avenue and Sirius Street share one island lifestyle but suit different buyers. Mainsail Avenue is for people who want a larger, higher-specification waterfront home, with recent sales in the mid-$1.9 million to $2.3 million range. Sirius Street is for those who want bigger blocks, a compact 11-house street and walkable schools in a more approachable band. Both deliver the same easy drive to Ettalong, Umina and Woy Woy and the same canal waterways, so the decision comes down to home size, block size and outlook.
Frequently Asked Questions
What is Mainsail Avenue St Huberts Island known for?
Mainsail Avenue is known as an established island street where homes mix three to five bedrooms and two to four bathrooms, with the larger four and five-bedroom waterfront and near-waterfront builds particularly prominent. Documented outlooks include wide canal frontage at number 11, a sheltered sandy inlet at number 33 and Shelter Cove views along the street.
What do Mainsail Avenue houses sell for in St Huberts Island?
Recent detached sales cluster from about $1.97 million to $2.3 million. 25 Mainsail Avenue sold for $1.97 million in April 2025, 18 Mainsail reached $2 million in November 2022, 33 Mainsail sold for $2 million in February 2026, and 11 Mainsail sold for $2.3 million. The island median sits at $1.9 million.
What are Mainsail Avenue’s lot sizes and typical home styles?
Observed lots run from about 648 to 696 square metres. Homes mix three to five bedrooms and two to four bathrooms, spanning older mid-century builds through to substantial modern rebuilds.
Is Mainsail Avenue a waterfront street in St Huberts Island?
Yes, for many addresses. Canal, sandy-inlet and Shelter Cove frontage are documented along the street, with 12 Mainsail Avenue sitting on Shelter Cove with uninterrupted views across to Daleys Point. The outlook varies by address, so it is worth checking each property rather than assuming a whole-street classification.
What schools are near Mainsail Avenue in St Huberts Island?
The catchment is Empire Bay Public School, about a 16-minute walk, and Brisbane Water Secondary College Umina Campus, about an 11-minute drive. Empire Bay Public School carries an ICSEA of 1,039 and the Umina campus 966. Nearby public and private options, including Coast Christian School, St Edwards College and Central Coast Grammar School, are mostly a short drive away.
What are Mainsail Avenue’s key lifestyle advantages?
Mainsail Avenue offers bigger-home waterfront living, wide water views and sunsets, private jetties and moorings, and the same five-minute drive to Ettalong, Umina and Woy Woy as the rest of the island.
What is Sirius Street St Huberts Island known for?
Sirius Street is known as a compact street of just 11 houses, about 80 per cent owner-occupied, on larger blocks with a neighbourly, tightly held feel. Homes are predominantly comfortable four-bedroom, two-bathroom family homes, many of them single-level.
What do Sirius Street houses sell for in St Huberts Island?
Recent detached sales cluster around $1.35 million to $1.68 million. 15 Sirius Street sold for $1.35 million in May 2026, and 10 Sirius Street sold for $1,675,400 in January 2026. Earlier, 13 Sirius Street sold for $1.5 million in 2021. 10 Sirius Street is currently guided at $1,525,000 to $1,575,000. The island median is $1.9 million.
What are Sirius Street’s lot sizes and typical home styles?
Observed lots run from about 696 to 883 square metres. Homes are predominantly four bedrooms, two bathrooms and two car spaces, including single-level brick and tile, while 10 Sirius Street adds a deep-waterfront jetty, pool and outdoor kitchen.
Is Sirius Street a waterfront street in St Huberts Island?
Yes. 10 Sirius Street is documented with deep waterfront and a jetty, and 15 Sirius Street carries a water-first everyday with kayaking, boating and fishing within easy reach. The outlook is best read address by address rather than as a whole-street classification.
What schools are near Sirius Street in St Huberts Island?
Sirius Street shares the Empire Bay Public School and Brisbane Water Secondary College Umina Campus catchments, both a short drive away. Several other schools are walkable, including Woy Woy Public School at about 13 minutes, Brisbane Water Secondary College Woy Woy Campus at about 17 minutes and Brisbania Public School at about 19 minutes.
What are Sirius Street’s key lifestyle advantages?
Sirius Street offers larger blocks, a quiet low-traffic 11-house street, walkable schooling, deep-waterfront access with a jetty, and a tranquil, water-connected everyday lifestyle.