The man whose firm designed Christchurch's CTV building is fighting an effort to have his actions investigated.
The office block collapsed in the 2011 earthquake killing 115 people, with a royal commission finding there were major deficiencies in its design.
An attempt by Dr Alan Reay's professional body, the Institution of Professional Engineers, or Ipenz, to look in to his role in the matter was scuppered when he resigned from the body.
Late last year the High Court ordered Ipenz, now known as Engineering New Zealand, to resume its investigation.
This will now be placed on hold while Dr Reay's appeal was considered.
Maan Alkaisi who lost his wife in the disaster said he and other family members were disappointed in the delay.
He has previously talked about the need for somebody to be held accountable over deficiencies in the building's design.
Dr Reay has declined to comment on the reason for his appeal.