Shortly after 22:00hrs Truck 21 was dispatched to the reported smell of gas in the Sugar Creek Subdivision. Arriving 5-minutes later an odor of gas was found with the area narrowed down to the 3300 block of North Sutton Sq. Going door to door personnel located an extremely strong smell at one particular residence, and when attempting to notify the homeowner, received no response. Checking all sides of the residence from the exterior no obvious source was found however, the gas meter showing a high flow of gas, was secured. At about the same time the homeowner awoke and called 911 to report someone banging on her front door. Being advised by the 911 dispatcher that it was the fire department, the homeowner met Truck 21 at the door where she was promptly told to leave her house. Personnel then entered the residence to ensure no other occupants were inside and attempt to locate the source of the leak. At this time the multi-gas meter indicated the interior atmosphere of the house was well within the LEL range and all personnel exited and the Lieutenant requested an upgrade of the incident bringing Battalion 21 and Engine 22. Upon arrival of additional resources Engine 22 was assigned RIT, Battalion 21 assumed command and Truck 21 performed ventilation. Upon arrival of the gas utility, and completion of ventilation, the source of the leak was found to be a pipe inside of a wall.