It was believed a person was still inside the property.
The incident happened at a domestic property on Handsworth Road, Blackpool.
It was first believed that someone may have been inside the property, however when firefighters arrived at the scene they found the fire was already extinguished.
All persons were accounted for.
Firefighters used breathing apparatus and a ventilation unit to clear the property of smoke and they were in attendance approximately 30 minutes.
There were no casualties reported.