An AMAZING waterfront mansion hits the market - boasting a dream pool, a 500-bottle wine cellar, 12-seat steam room and an entertaining area that could be the best in Australia

• e-mail

An extravagant mansion built on a hillside sand dune overlooking Port Phillip Bay offers some of the best views in Australia and could be described as one of the nation's 'coolest' homes.

Sprawled over a 3,000 square metre estate, the one-of-a-kind house designed by Croft Developments in Portsea, a summer destination beloved by Melbourne's social set roughly 95 kilometres south-east of the CBD, has seven bedrooms, seven marble bathrooms and a garage with parking space for eight cars.

Fronted with 60 tonnes of New Zealand-imported schist stone - the equivalent of 10 adult African elephants - the luxury home boasts a 12-seat steam room, billiards room, cavernous wine cellar with space for over 500 bottles and an internal lift that carries you from the basement to the ground floor.

A white-tiled infinity pool spills over the front terrace which also houses a spa - controlled by an iPhone app - and a grass tennis court.

Don't judge a book by its cover: It may look ordinary, but behind the front door of this Portsea home is a sprawling 3,000 estate that could be described as one of Australia's coolest houses

A white-tiled infinity pool (pictured) spills over the front terrace which captures an unrestricted view of Port Phillip Bay

Sustainability is at the heart of the 1,374 square metre house, with floors of recycled timber and 46 skylights dotted across the ceilings, illuminating every inch.

The floor size dramatically eclipses that of the average Victorian home, which was 244.8sqm in 2018 according to figures from the Australian Bureau of Statistics.

Solar panels and five gas log fireplaces heat the vast living spaces during winter, while a 207,000 litre underground water tank takes care of plants and grass throughout the summer.

An open-plan living room, library and office are spread across the entry-level, along with six of the seven bedrooms including the master which has a walk-in wardrobe and an ensuite that looks directly over the water.

The main kitchen (pictured) is fitted with premium Miele appliances and has a butler's pantry

A 12-seat steam room (pictured) is just one of the many standout features that make the mansion one of Australia's coolest houses

The 1,374 square metre floor size eclipses that of the average Victorian home, which was 244.8sqm in 2018

Real estate agent Liz Jensen, who is overseeing the sale of the property, said features like the tennis court (pictured) make the house a 'real standout' in the Portsea area

A spa which can be controlled by iPhone (right) sits on one side of the infinity pool

A self-contained outdoor kitchen fitted with a gas barbecue, Teppanyaki plate and fridge is tiled with premium Brazilian quartz.

Real estate agent Liz Jensen, who is overseeing the sale of the property, told Daily Mail Australia it is a 'real standout' in the Portsea area.

'This is the culmination of everything you want in a home,' she said.

Ms Jensen said the house was designed and built by a local family firm who have renovated a series of beachside properties in the VIC 3944 postcode over the past 10 years.

All seven bathrooms are fitted with marble tiles and freestanding bathtubs (pictured)

The basement, which is floored with polished concrete, houses a cavernous wine cellar (pictured) that holds over 500 bottles

A sunlit billiards room (pictured) opens out onto the grass tennis court that runs along one side of the house

Sustainability is at the heart of the house, which is illuminated by 46 skylights (eight pictured above the terrace)

Sunlight floods one of three spacious living areas (pictured) through Velux skylights

An office, library (pictured) and open-plan living room are spread across the entry-level

'The houses have gradually improved over time. We're talking increased equity, increased size and scale, they've kept upgrading better and better properties,' she said.

The Portsea mega-mansion is the 'ultimate' of these upgrades, according to Ms Jensen, who describes the quality of the home as 'of a calibre rarely seen' in the region.

She believes the perfect owner would be a mature local couple who are 'young in spirit' and love entertaining friends and family at home.

Five gas log fireplaces (left) dotted throughout the house provide heat during winter

Floors and ceilings are made from recycled timber (pictured), while the outside of the house is fronted with 60 tonnes of schist stonework imported from New Zealand

A 'floating' timber stairs with LED lighting (pictured) runs between the basement and ground floor

The basement houses an enormous garage (pictured) with parking space for eight cars

'They should love Portsea and want the very best it has to offer - view, location and a house that makes everyone happy,' she added.

Since hitting the market just before Christmas, Ms Jensen has shown 20 prospective buyers around the property and currently has three interested parties vying for the winning bid.

The asking price is set between $8.8million and $9.75million (AUD), a minimum of $6.2million more than the average price of a property in the area, but interest to date suggests it is likely to fetch considerably more.