Four fire engines and around 25 firefighters tackled a flat fire on Taywood Road, Northolt.
Part of a three roomed flat on the fifth floor was damaged by the fire. One woman was treated on scene by London Ambulance Service crews.
Control Officers took the first of five calls at 1439 and mobilised crews from Southall and Northolt fire stations to the scene. The fire was extinguished by 1539.
The cause of the fire is currently under investigation.