Police were called to a house on Wells Walk, Ilkley, at 3.50pm on Sunday to reports of a man on a roof.
Police found a fire and fire crews discovered a bedroom ablaze.
Fire-fighters wearing breathing apparatus tackled the blaze.
A person was reported to be in the premises but was outside when fire crews arrived. The fire service said the cause of the fire was arson.
A man, 26, was arrested in connection with the incident.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article