Eighteen months on, Wagstaffe's 6 Bulkara Street is back on the market and expected to blitz the region's $10.5 million sale record.

Boasting seven bedrooms with en-suites and a private boatshed, jetty and mooring, the 2188 square metre waterfront property has a guide of $13.5 million.

It is for sale via expressions of interest and is already attracting buyers.

The property could pull in an estimated $250,000 annually if rented, however, it is expected to sell as a private holiday home.

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"It's got a lot of interest already, mainly from Sydney holiday home buyers and some overseas [interest]," Belle Property Central Coast's Cathy Baker said.

Situated in the prestigious five-home San Toy Estate, just a 20-minute boat ride from Palm Beach, the property was a one-bedroom boatshed when it sold for $1.65 million in 2013.

The mansion was completed in 2018 and took out Australian House of the Year and Best Custom-Built Home at that year's Housing Industry Association awards.

A sale of $12 million would reflect a price rise of more than 25 per cent in 18 months.

Mrs Baker said a number of factors played into the record-setting asking price.

"I think it's a combination of the NorthConnex and travel time to Sydney being shortened, and a lot of people working from home and using a dual lifestyle and seeing the benefit in investing into Australian holiday homes," Mrs Baker said.

Named 'Agave', the home is set over two levels and includes a four-bed bunk room and a high-tech media room.

The outdoor entertainment area takes in tropical gardens, a barbecue, infinity pool, private beach and views out onto Brisbane Water.

The property's sale campaign is being fronted by model and former The Block winner Elyse Knowles.

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