[4] It was founded in 1968 as a branch of Mainline Corporation, an Australian company, to develop 7 acres (28,000 m2) of harbour-front land in the Auckland CBD as part of Mainline-Dillingham-Fletcher.

[8] Following the Christchurch earthquake, 2010 Vero appointed the MWH Mainzeal joint venture as their preferred partner in their efforts to rebuild Canterbury.

[11][12] On 13 February 2013 receivers took control of Vic 200 Ltd, the company that owns Mainzeal's head office building in central Auckland.

In March 2021 this order was overturned by the Court of Appeal, which found that although the directors had breached their duties, this had not caused any actual loss to creditors.

[16] An appeal to the Supreme Court (which Mainzeal built[17]) resulted in a ruling in August 2023 that the directors were liable for $36m in damages.