The fire broke out shortly after a line of thunderstorms came through the area.
The building was engulfed in flames when the first firefighters arrived within minutes of the 11:09 p.m. dispatch.
Firefighters kept the flames from spreading to an adjacent building.
Bart Township firefighters were assisted by volunteers and equipment from Lancaster and Chester counties. They trucked water from fill sites on Wilson Rd. and Heyberger Rd.