A fire at a semi-detached house in Leyland is thought to have been started deliberately.
Lancashire Fire and Rescue Service received an initial report that someone might be trapped in the property on Seven Stars Road.
Firefighters attended after receiving the emergency call just before 10.30pm on Saturday.
Using breathing apparatus they completed a search of the building but found no-one inside.
They extinguished the fire using a hose reel jet and extracted smoke from the building with a portable fan unit.
A police and fire investigation is under way.