The council said this was of "obvious concern'' and it would not approve public use of the building until it was satisfied that the issues had been "fully rectified''.
Dominion was issued with a "Notice to Fix'' by the council on August 21, requiring them to solve problems on the site.
The 4000sq m mega-store was expected to open tomorrow but is now due to open on October 18.
QLDC building control inspections team leader Jonathan Shaw confirmed today that remedial works were under way at the site.
"The QLDC Building Services team investigated and then issued the Notice as soon as we were made aware of these construction issues,'' he said.
Dominion Constructors and Queenstown Central have both cooperated fully with the council to remedy the issue and approval for remedial work to begin was granted on September 21.
Grant Thomas, Dominion's South Island construction director, claimed this week that delays to the store opening were "solely related to weather and not as a result of the Notice to Fix''.
Mr Shaw said the council had engaged its own independent engineering advice and had been closely monitoring the remedial engineering design and work on the site since the Notice was issued.
"QLDC is confident that once these works are completed and approved that the building will be compliant and therefore safe for the public and the businesses operating from those premises.''
The $100 million first stage of the project includes about 10,000sq m of shopping space spread across four buildings and about 4000sq m of office space.
The project will house about 45 tenants in total.
