The fire was reported off of Twin Run Road in Hempfield Township, Westmoreland County, a little before 3 a.m. Tuesday.
The homeowner said photos and other items were inside that pool house.
Several firefighters were called to the scene and there was a reported issue with water supply.
No one was hurt.
There was no word on what sparked the fire.
Source: Westmoreland County homeowner awakens to bright flames as fire destroys storage building