Property portals and estate agents are failing buyers of leasehold properties by not flagging up legally required information.
The government has set out new targets to fix unsafe buildings in England as part of its Remediation Acceleration Plan.
Nearly a quarter of mortgages on mid-rise flats required an ESW1 form this year, despite government promises that leaseholders in these blocks affected by the cladding scandal would no longer need one when selling or remortgaging.