Florence was in town for the conference which also marks 20 years of NZCB. The conference began yesterday and finishes this afternoon.
He said the first conference was held in Rotorua so it was decided to bring it back to where it began.
Florence said having the conference in Rotorua had also meant they could take advantage of some of the things the city had to offer.
Some people at the conference had visited Red Stag Timber on Friday and there was also a trip to the carving school at Te Puia planned.
The conference also includes the Great Apprentice Race which 19 apprentices race carts they have constructed during the day as part of the NZCB Apprentice Challenge.
More than 780 people attended the conference held at the Energy Events Centre.
Florence said it was an opportunity to look back at how significantly the construction industry had changed in two decades, and address the challenges ahead including a skills shortage.
NZCB requires builders to hold a formal building trade qualification to be eligible for membership and it remains the only one of New Zealand's two building trade associations that requires this.