At 12.38am on Saturday (30) crews were called to a fire on Coleseed Road in March.
Two crews from March, one crew from Chatteris and a water carrier from Ramsey attended the incident.
Firefighters arrived to find a large wooden building well alight. Wearing breathing apparatus they extinguished the fire using hose reels and jets and returned to their stations by 3.35am.
The cause of the fire was deliberate. Anyone with information should contact police by visiting www.cambs.police.uk to submit an online report or call Crimestoppers on 0800 555111.