One appliance and crew from Gerrards Cross, one from Slough and one from Windsor, Tinkers Lane attended, along with an officer.
Smoke was issuing from a barn when they arrived.
The firefighters used two sets of breathing apparatus, and three hose reels.
A van within the barn was destroyed by the fire. The barn was around 50 per cent damaged by smoke, fire, and water. One tractor was also damaged.
Thames Valley Police was notified.
