Four people fled to safety when flames engulfed a bedroom.
A woman left her TV on while she took a shower and returned to find the set ablaze yesterday evening.
She and three other occupants escaped unhurt from the semi-detached house in Bannings Vale, Saltdean, Brighton.
Firefighters arrived at the scene just before 11pm and spent two hours extinguishing the flames.
A brigade spokesman said: "There were no smoke detectors in the house.
"An alarm would have given the occupants an early warning and prevented much of the damage."
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