Work also meant the removal of a scheduled phoenix palm and liquidambar tree and chopping down 16 generally protected trees, she said.
The Warehouse's spokesperson challenged Covington's report.
"To our knowledge the textile building was not an historic building and had no status as such," the spokesperson said.
"We progressed consent through the standard process.
"Regarding the removal of trees, there were two protected trees of a poor quality. One was a a phoenix palm - now classed as a noxious weed - and a liquidambar."
The company had fulfilled a condition of the consent to plant four large-grade trees and five large Puriri trees, at Hendry Ave in Hillsborough, the spokesperson said.
"Extensive landscaping in excess of $300,000 on site has been undertaken including over 4000 plants and 105 trees."
The new store, near the Mt Albert Rd intersection, opened on Saturday.