The cause of the fire is currently under investigation
Eight fire engines and around 60 firefighters were called to the fire at 4:12pm, and London Fire Brigade said the fire was under control by 6:13pm.
A ground floor sauna and plant room were destroyed by the blaze, and there were no reports of any injuries.
Fire crews from Hayes, Feltham, Hillingdon, and surrounding fire stations attended the incident. The cause of the fire is currently under investigation.