Seven people managed to escape a house in Two Mile Ash after it was destroyed by a fire.
Firefighters from Great Holm and Newport Pagnell were called to the fire at The Approach at 3.43pm on Saturday and police were called minutes later.
By the time the emergency services had arrived the fire had already spread through the house to the roof.
Bucks Fire Group Manager Ian Taylor, one of the officers who attended, said: “Following a large number of 999 calls it was established that seven people were in the building at the time of the fire.
“All seven who evacuated the premises did so from both ground and first floors without injury as smoke detection was present.”
Volunteers from the British Red Cross Fire and Emergency Support Service attended in the evening to give support to those affected.
Buckinghamshire Fire & Rescue Service are investigating the cause of the fire which has left parts of the house unstable.
Thames Valley Police have launched an arson investigation into the fire which consumed most of the house and some vehicles outside.
Detective Inspector Phil Hayes said: “The property is currently cordoned off and is likely to remain so for the next couple of days while enquiries are being made. The initial response involved some road closures in the area which have now been lifted.
“If anyone has information which may assist our investigation, we would encourage them to come forward.”
Anyone with information can call police on 101 or Crimestoppers, anonymously, on 0800 555 111.