"Currently it's around 50 per cent of what we produce and we have eight dealers there."
Surtees Boats developed its hull technology in the rough waters off the Whakatane coast, he said. "A lot of the boating that Australians do is in open water and that's where we find our boats have massive appeal."
But Mr Dyck noted the brand was enjoying strong sales across all of the markets in which it operated.
"This ability to increase our production will allow us to expand into new sales markets and to meet the demand we expect to experience once those markets are established."
The company was started during the early 1990s when Neil Surtees decided to design and build himself an aluminum boat to use for fishing off the Whakatane coast.
By 2005, he had decided to sell but ultimately retained a stake when Toni Palmer, Phil Sheaff, his brother, Dave Sheaff, and Don Howard, came in as shareholders.
All of the owners are based in Tauranga or Whakatane and are closely involved with the company.
Ms Palmer, who chairs the company, said Surtees Boats had a backlog of about 200 pre-sold boat orders a year.
"Our rural location made it difficult to firm up the expansion plans, but the build is now completed and we'll be moving into it next month," she said.
"Then we can look at finding the right extra staff to keep production levels up. The new production capabilities will allow us to expand to export markets beyond Australia."