The state fire marshal has been called in to investigate an early morning house fire off of South Ridge Road in Summerville.  Summerville, Lyerly, Hays and Trion Fire Departments responded to the blaze at a house that was being built by Assistant Chattooga High School Principal Jimmy Lenderman around 3:30 Monday morning.  According to emergency personnel on the scene, the structure was fully engulfed in flames when the fire departments arrived.  Arson is suspected in the blaze.