Police are investigating as incident of arson with intent to endanger life which occurred in the early hours of Monday 6 May between 4am and 4:15am on London Road in Carlisle.
A Cumbria Police spokesman said: “A male wearing a white t-shirt, jeans and shoes entered a drive way and set light to a trailer causing damage to the trailer, an exterior window and wall of the house.
“Police are appealing for witnesses who may have been in the area at the time to come forward with any information.”
Anyone with information is asked to contact PC2749 Ballantyne on 101, or Crimestoppers on 0800 555 111, quoting log number 44 of May 6.