The online platform will allow home buyers and home owners looking to refinance to compare mortgages from more than 30 lenders. The launch is planned for early July.

Domain attracts a total audience of 5.3 million across its app, website, newspaper inserts and magazine.

The experience of similar businesses branching out into complementary offerings is encouraging, Mr Catalano said, noting UK property search website Zoopla's success in generating 50 per cent of EBITDA from a utilities connection service.

Domain is also expected to launch a comparison website for home insurance in the near future.

Domain Loan Finder will join Domain's own utilities connections business Compare and Connect, which also allows users to compare services from the entire marketplace rather than from a single supplier as seen by other players in the sector.

The new business will round out a suite of offerings or adjacent businesses including open for inspection check in and management service Homepass, home improvement and maintenance business One Flare, data service Pricefinder and customer relationship management tool MyDesktop.

Mr Catalano said the time was right to make the push into complementary offerings now that the core business of property listings was meeting expectations.

"The Domain business is now four years into an aggressive expansion plan. Our first goal was to get parity of agents and listings. That remains our core business. The core is set. But the time is right for us to ask where else can we add value through the property life cycle?"

Domain, owned by Fairfax Media, the publisher of The Australian Financial Review, is the key asset attracting competing bids for the company from private equity firms TPG and Hellman & Friedman.

A controversial report from UBS earlier this year showed that $2.4 billion was paid in mortgage broking commissions in 2015, up 18 per cent from $1.5 billion in commissions earned in 2013. UBS analyst Jon Mott said that brokers were paid an average of $4600 for every loan they write.

The commissions paid to mortgage brokers have attracted scrutiny in recent years as more and more banks rely on brokers for deal flow and after the Sedgwick report into banking remuneration commissioned by the Australian Bankers Association declined to prescribe a way forward.