The West Midlands Fire Service said it was called at 7.47pm on Friday (April 18) to reports of a shed fire at a property in Speakers Close in Tipton.
A member of the public who made the call was concerned that the fire would spread from the shed, which is attached to a house, to a conservatory.
Eighteen firefighters have been battling the fire with a hosereel jet and two breathing apparatuses.
Residents have been told to avoid the area where possible.