One appliance and crew from High Wycombe, one from Northamptonshire, one from Bedfordshire and one from Buckingham attended, along with two officers.
A large outbuilding, located within a grass meadow, was well alight when they arrived.
The incident was generating multiple calls to Thames Valley Fire Control Service.
The firefighters used:
- One main jet
- One hose reel jet
- Small gear
- A thermal imaging camera
The building was destroyed by fire.
Thames Valley Police was notified.