The court heard how Daniel Bartlam hit his mother seven times with a claw hammer at their home in Georgia Drive, Redhill, Nottingham.
He then poured petrol around her bedroom before lighting newspaper on a gas fire and setting the property alight.
More top news
Former world title challenger Michael Watson and his carer were assaulted by would-be thieves in an apparent car-jacking attempt.
Iraq's prime minister, Haider al-Abadi, announced the offensive on the western half of the city after a lull in the fighting.
David Norris, one of the men who murdered Stephen Lawrence, is seeking £10,000 in damages from the government after he was attacked in jail.