Emergency services were called to Porter Street South at around 8.30am on Wednesday.
A total of 15 firefighters attended the scene to tackle the fire in the basement of a three-storey building.
A woman was led to safety, before being treated by paramedics at the scene.
A spokesman for West Midlands Fire Service said: "On Wednesday, shortly before 8.30am we were alerted to a fire in the basement of a three-storey building on Porter Street South, Dudley.
"Three fire engines from Brierley Hill, Dudley and Haden Cross and 15 firefighters attended the scene. Six breathing apparatus and two hose reel jets were used to put out the fire before specialist fans were used to ventilate the property.
"Crews led a female to safety using a fire escape hood, who was then tended to by ambulance colleagues at the scene.
"Firefighters isolated the gas and electricity supply and requested the attendance of engineers."
A West Midlands Ambulance Service spokesman said: "We were called by the fire service at 8:41am to a fire at a property in Porter Street South. We sent one ambulance and two paramedic officers to the scene.
"Crews treated one patient, a woman, and she was discharged at the scene.”