Merhis Group, the Western Sydney developer and builder that is the subject of two wind-up actions by the Australian Taxation Office over unpaid taxes, has been accused of delivering incomplete and defective buildings by residents in at least two of its apartment developments.

The allegations come amid growing concerns about apartment building standards following the evacuation of residents from the Icon-built Opal Tower at Sydney Olympic Park after cracks appeared in a 10th-floor precast concrete panel and longer-running non-compliant cladding issues in buildings like Lacrosse in Docklands that caught fire in 2014.