Discount retail outlet Dress-Smart in Onehunga has been expanded and upgraded, with about another 1000sq m added.
Gaylene Powell, centre manager, said the work had been completed and Puma, Asics and Kathmandu would occupy the new areas.
The property is owned by Lend Lease Real Estate Partners New Zealand and managed by Oyster Group.
Restrooms have been renovated and new facilities include two disabled toilets and an additional, dedicated parenting room, Dress-Smart said.
Further new undercover carparking areas have been added too.
The centre opened in October 1995 when it was a quarter of its size today.
"As the concept of outlet shopping took hold, the site has been enlarged and now includes a well-utilised tourist shuttle which collects shoppers from a number of city hotels and brings them to Dress-Smart several times a day," Dress-Smart said.