Four fire engines and around 25 firefighters attended a fire on Harold Road in Park Royal.
Half of a garden shed was damaged by fire along with part of a lean-to at the rear of a terraced house. The rear of a neighbouring property also sustained some partial damage.
One person was treated at the scene by firefighters.
The Brigade received the first of six calls about the fire at 1515 and Control Officers mobilised crews from Park Royal, North Kensington and Hammersmith fire stations to the scene. The fire was extinguished by 1631.
The cause of the fire has been recorded as accidental.