The extension incorporates 100 square metres of public space, additional storage and an elevated control tower for better viewing of the courts.
Pak'nSave Hastings owner Brendon Smith said growth in the sport had been a factor in his company's decision to extend its operational sponsorship of the centre through until 2025.
"It's great to be part of something that is so successful and we can only see it getting better," he says.
Hastings District Council has provided half of the funds for the project with the balance having come from Sports Park Trust fundraising and a capital contribution from Hawke's Bay Netball.
The extended building is expected to be completed in October.