Firefighters tackling blaze in Burghfield
Four pumps initially attended the blaze at a derelict building in Bunces Lane but this has now been upped to seven.
A spokesman for the Royal Berkshire Fire and Rescue Service said that the building was well alight and that crews were trying to establish whether there was anything dangerous inside the building.
He added that it was likely crews would remain at the scene for several hours.
The cause of the fire is currently unknown.
Burghfield resident Andrea Hall tweeted: "Fire engines at Springwood Engineering warehouse in Burghfield Common. Watching the flames from my house opposite!"
The blaze comes just hours after firefighters announced that the planned five-hour strike set to occur tomorrow (Saturday) had been called off.