Fire crews and other emergency services battled a fire at a £3 million property on one of the most expensive streets in London on Tuesday night.
The grade 2 listed building on Hyde Park Gardens Mews was gutted by a fire that started in the basement.
Eight fire engines, from Kensington, Paddington, Euston, North Kensington, Hammersmith, Soho and West Hampstead, with 58 firefighters and officers attended the scene, according to London Fire Brigade.
There have been no reports of injuries.
Neighbour Eric Butterfield said to the Standard: “The owner was locking up the house to go home when she smelt smoke.
"I think she put the gas fire on for a couple of hours but she doesn’t know how the fire started.
"The house is not finished yet and it has had work on it for over a year including a new basement. There were tradespeople in there today.”