Burton firefighters attended a house fire on Palmer Close in Branston on Monday afternoon at 4.40pm.
"The fire started accidentally after an electric heater had been left on for a long period of time and had overheated."
All of the occupants were safely outside on arrival and firefighters used one hose reel jet to tackle the fire which involved an electric heater and the carpet.
Watch Manager, Ian Pullen said: "The fire started accidentally after an electric heater had been left on for a long period of time and had overheated. The fire then spread to the carpet but luckily the occupants were home and noticed the fire before it spread any further.
"They did the right thing by evacuating and contacting the fire service however they only had a smoke alarm upstairs which did not activate due to the fire being downstairs.
"Firefighters fitted an additional smoke alarm on the ground floor before leaving the incident and also carried out a free Home Fire Risk Check.
"It appears the heater was being used to dry nearby clothes which were hanging up. We would urge people not to leave electrical appliances turned on for long periods of time and not to use electric heaters as a way of drying clothes as they could quite easily catch fire."
Crews left the scene at 5.35pm.