A bogey on the 18th saw him finish 19-under par and tied with a fast finishing Matthew Millar, forcing just the second playoff of Pearce's career.
"I had a playoff in a pro-am back home which I lost, so 50 percent now in my career is not too bad!" Pearce laughed.
"He (Millar) is a great golfer and he's been playing some fantastic golf the last couple of years especially around Australia so to be up against him was always going to be tough, I knew he'd come out firing.
"It's nice to beat a player of that quality."
It took Pearce three extra holes to emerge victorious after he made par and Millar bogeyed the par-4 18th hole at City Golf Club.
More importantly this win gives Pearce exemption on the ISPS Handa PGA Tour of Australasia for the remainder of this season and 2018, security he said he's happy to have for the first time in his career.
"I haven't been exempt going in to a year before so it really helps. Winning is winning, it's awesome for the confidence," added Pearce who has attended Qualifying School the past four years.
"Hopefully I can build on this and have a really good year and jump on to a main Tour somewhere."
There'll be a short rest for the New Zealander who has status on the PGA TOUR China which tees off it's season at the Henan Open on May 9.
"I've got status up in China, so I'll be playing PGA Tour of China when it starts around May and I'll also be playing the remainder of this season in Australia."
Matthew Millar was a gallant runner-up, firing the best round of the day, 6-under 64 with eight birdies, to put the pressure on Pearce and force the playoff.
For his win Pearce claimed AU$18,750 in prizemoney and is now 20th on the ISPS HANDA PGA Tour of Australasia Order of Merit.
It was a good week for more than just our new champion with Mark Brown back to his best posting a tournament total of 15-under and finish in fourth place.
Brown carded four very solid rounds of 68, 64, 66 and 67 to finish just four shots behind his fellow Kiwi.
Waikato's new professional Luke Toomey has backed up a solid week at the New Zealand Open with a ties 24th at the Queensland PGA Championship.
After opening with two beautifully constructed rounds of 66 and 67 he couldn't quite keep up with the pace over the weekend.
Pearce's exciting playoff victory makes for back to back New Zealand champions on the tour, both in extra holes which is a theme we could get used to.