
The acquired company, Sherlock Publications, also publishes the print titles Hotproperty, Renting and Overseas.
Propertyfinder.com claims that a combined website will attract 2.4 million monthly unique users and 5,500 subscribing estate agents, as well as being a stronger proposition for advertisers.
In October last year, News International made a multimillion-pound investment in property search engine Globrix.
News International's moves are aimed at eating into market leader Rightmove.co.uk's number one position in the online property market.