Emergency services were sent to the house on Estcourt Drive in the village of Darrington this afternoon.
Images from the scene show a fallen tree in the garden of the property, but further details of the accident have not been released.
It is not known if he was working at the property or a local resident.
West Yorkshire Police said
"At 12.50pm Police were called to Estcourt Drive, Pontefract to reports of a concern for safety.
"Officers attended and found a man believed to be in his 20s in a serious condition, he died a short time later as a result of his injuries.
"The Health and Safety Executive have been informed."