Four fire engines from Lancaster, Morecambe and Bolton-le-Sands attended the blaze just before 5am in Dalton Square.
Crews equipped with breathing apparatus brought the fire under control.
Fire crews attend basement blaze in Lancaster
Fire crews were called to a basement fire at a commercial property in Lancaster city centre in the early hours of Tuesday.
By The Newsroom
Tuesday, 30th January 2018, 8:24 am
Updated Tuesday, 30th January 2018, 8:25 am