"It is the seal of approval we have been waiting for. There are other potential funders out there who have been waiting for this announcement before committing to the project and we hope they now have confidence they are backing a winner," he said.
Mr Joyce said the centre was expected to generate up to $3.7 million for Northland each year. Seventy people would be required to build it and 30 permanent staff would be needed to run it.
Northland Inc chief executive David Wilson said the move would inspire confidence in the project, which he saw as a catalyst for hotel development, and an antidote to Whangarei's highly-seasonal visitor market.
He said today's announcement would bring an "immediate change in perception of Whangarei".
"The HAC will be a major influence on the future of Northland's visitor industry and the government's announcement today will give the people of Whangarei and Northland greater confidence to know the visitor industry in the region is continuing to flourish," Mr Wilson said.
"The great thing is that the HAC will change Whangarei from being a 'quick-visit' or 'pass-through' destination for most international visitors, to a 'must-see' riverside city with an iconic cultural attraction of international significance."
A June 2015 referendum of Whangarei residents brought a final decision on whether or not the centre should go ahead - a debate which had plagued the town for more than 22 years.
More than 27,000 people voted in the referendum, with 14,256 giving Hundertwasser the tick of approval.