An investigation is underway after fire crews were called to a late night fire in Longton.
Crews from Preston, Penwortham and Tarleton were called to reports of a detached building fire on Gill Lane at 22.28pm.
A Lancashire Fire and Rescue Service spokesman said: "It was unclear whether there were persons still in the building, however crews quickly ascertained that there were no casualties involved."
Firefighters used four breathing apparatus, two hose reels and a ventilation unit to extinguish the fire.
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The spokesman added: "Crews were at the scene approximately two and a half hours and an investigation into the fire is now underway."