Two crews from Bradford and another from Shipley were sent to the scene in Fagley Road just after 6.10pm this evening.
The initial report had been about a caravan fire with people possibly inside.
A West Yorkshire Fire Service spokesman said: "When crews arrived they found a caravan and a number of outbuildings were involved.
"There were also a number of Liquid Petroleum Gas cylinders involved."
He said firefighters used four sets of breathing apparatus and two large jets to put out the fire.
"After a thorough search of the caravan and outbuildings, it was found no one was involved," he added.