The fire was being treated as suspicious and had been referred to the police.
Mr Matchitt said the building became engulfed in flames very quickly but the job was "fairly straightforward" for the four fire appliances that attended.
"It's very unusual for a building to be that fully involved so quickly," he said.
Mr Matchitt said there was not much the fire service could do about derelict buildings unless they posed an immediate risk to public safety.
Jubilee Park was owned by Whangarei City & District Rugby League Inc but had not been used by the club since 2011.
Board member Sharon Bird said the field was used daily by a nearby school and another section of the park was leased to an educational trust.
The board was waiting for a fire investigation to be finished before any decision could be made on the future of the grounds, including a large grandstand and changing rooms next to the burned-down club.
Whangarei Central Holiday Park is next door to Jubilee Park. A staff member who asked not to be named said he decided to err on the side of caution, evacuating people in cabins near the fenceline on Saturday.
"If the wind wasn't blowing the direction it was, we probably would've lost a couple of cabins," he said.
The park was a hot spot for vandalism, prompting him to call the police several times but "nothing much seems to happen", he said.
"It seems like there's [vandals] there every week ... It brings the whole area down."
Dot Ellery's Cooke St home was less than 100m from the blaze she described as "too close for comfort".
"It was scary - I saw smoke then heard the sirens. When I saw [fire] engines, that definitely got me worried. I can still smell the smoke from the fire," she said yesterday.
