Six fire crews responded to a blaze at Upper Hutt College in Trentham.

Fire fighters have been called to a blaze at Upper Hutt College in Trentham.

Central communications shift manager David Meikle said six appliances responded to a fire in one of the school's technical blocks about 9.40pm on Friday.

The fire was extinguished by 10.15pm and there were no reports of injuries, he said.

"It didn't appear to be a big inferno or anything like that."

It was too early to say how damaged the school was or what caused the fire, Meikle said.

Part of Moonshine Rd had to be closed and traffic diverted while fire fighters tended to the blaze.