Six people were displaced from their west Windsor home on Tuesday.
Fire crews were called to two-storey house in the 1100 block of Harrison Avenue, west of Huron Church Road, just before 1 p.m. Tuesday.
One person suffered smoke inhalation was transported to hospital with non-life-threatening injuries.
Officials said the fire originated in the basement and the cause was improper discarding of smoking materials.
The house was reportedly used for renting out individual rooms.
Damage is pegged at approximately $400,000.