Platform makes claim as it reveals that Barratt has signed up its three key brands to the portal.
Read MoreTaylor Wimpey joins OTM as it battles leasehold scandal investigation
The UK's third largest builder is to advertise its properties and developments on the portal, joining many of the other major construction firms including Barratt and Persimmon.
Read MoreFour major house builders under investigation for leasehold mis-selling
Five months after saying it would look into the scandal, the CMA says the firms to be probed are Barratt Developments, Countryside Properties, Persimmon Homes and Taylor Wimpey.
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