Ten fire engines and around 70 firefighters attended a fire at a derelict church on South Road in Southall overnight.
At the height of the fire, most of the ground floor, first floor, second floor and roof of the church were alight. There have been no reports of any injuries.
A London Fire Brigade spokesperson said: “The fire was brought under control overnight with crews deploying 32-metre turntable ladders as water towers to tackle the fire from above.
"Firefighters have remained on scene in the hours since working to fully extinguish the fire and put out hotspots. This work was completed this afternoon and the Brigade has now left the site safely in the care of partner agencies.
“The building has sustained a significant amount of damage due to the fire, resulting in the collapse of the roof and the upper floors. Following an assessment by the local authority, the derelict church building has been declared structurally unsafe but there is no risk to surrounding properties.
"South Road, which was shut in both directions, has reopened with local businesses operating as usual.”
Control Officers took the first of over 20 calls at 2130 and mobilised crews from Southall, Ealing, Heston and surrounding fire stations to the scene. Two 32-metre turntable ladders also attended at the height of the fire.
The fire was brought under control by 0038.