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
From Kim Jong-Un's age to Pyongyang's new time zone - ten things may not know about the secretive republic.
Five Palestinians were reportedly shot dead by Israeli soldiers after a fresh spate of clashes broke out in the conflict-ridden region.
This weekend: Patchy rain in the northwest, dry and bright elsewhere.