One appliance from Taunton station was initially mobilised to reports of a fire in the grounds of an old school on Lyngford Road in Taunton at 12:17 this afternoon (Wednesday).
On arrival crews found a fire affecting the outside corner of a building and requested an additional fire appliance to assist.
A second appliance from Taunton was mobilised.
A small amount of rubbish was well alight next to the building so crews set to work using one hose reel jet to extinguish it.
The fire also caused damage to the exterior of an unoccupied building.
The police were informed as the fire was believed to have been set deliberately.