About 600 staff and invited guests filled part of the drive-through inside the DIY store to watch Neville Dippie (centre) saw through a custom-made "ribbon" and declare the $25million building open.
He was assisted by his sons, co-owners Martin (left) and Allan.
The 29,000sqm building was completed in 14 months, despite delays because of Covid-19.
The store is more than twice the size of the old store, and was overflowing with customers on Saturday, its first official day of business.