The property, called 'Soul of Gerringong', is located at 143 Belinda Street.

It has hit the market for only the third time since it was built about 140 years ago, and will be auctioned on April 7.

The property underwent a major renovation by Ben and Simone Mathews, a Sydney-based builder and interior design team.

The Cronulla-based husband and wife team bought the property in October 2015 as an original coastal farmhouse, now transformed into a coastal retreat, with four dwellings sitting across two titles on approximately 1525sqm of land.

They spent nine months restoring the farmhouse and adding some additional dwellings, but ensuring they re-purposed all the original materials on-site, a lengthy process Mrs Mathews described as a "labour of love".

The property now consists of a four-bedroom farmhouse, two-bedroom pool-side cabana, one-bedroom studio barn and a separate three-bedroom cottage sleeping up to 22 people.

Mrs Mathews said their goal had been to "create a new style of accommodation" for the South Coast.

"It was about blurring the line between a holiday house and a boutique hotel," she told the Mercury.

"When we came to the town, the property had been one of the original farmhouses, and it had the soul of the town in it.

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"It had sentimental value to the locals in the community... We wanted to return it to its former glory, but bring it to today's expectations in a property."

'Soul of Gerringong' opened in late 2017.

Mrs Mathews said it quickly became a sought-after haven which is booked out months in advance for holiday stays, corporate retreats, "and for people looking for a slice of zen".

The property is being sold with the 'Soul of Gerringong' business attached, and has a price guide of about $4 million.

The Mathews had been renting elsewhere in Gerringong for a few years, enjoying the lifestyle, before returning to Sydney in January.

Mrs Mathews said they were selling as they planned to move on to another project.

"It's what we do - for us, when we create magic it's actually creating the properties," she said.

"We come from a development background, so for us it was always the goal to introduce a new style of accommodation, build up the business, then on-sell it and move on to something else."

The selling agents are Ray White Gerringong's Neil Campbell and Ray White Double Bay's Craig Pontety.