Firefighters and police were called to Lutterworth Road in Wolvey on Saturday evening.
Warwickshire fire control received a number of calls about a building on fire in Lutterworth Road, Wolvey just before 11pm on Saturday.
Two fire crews were sent to the scene, followed by another shortly afterwards.
Two out buildings and two caravans were on fire.
Firefighters used specialist equipment to put the blaze out - which took just over an our. Crews spent another two hours damping down.
Police were also called to investigate what they believe could be a arson attack.