The lifeless body of Layton Carr was found after the blaze on Friday night at Fairfield industrial park in Gateshead, Tyne and Wear, which took firefighters two hours to extinguish.
Joanna Kowalczyk, 29, from Gateshead, Tyne and Wear, declined a procedure at hospital for her injury, caused during a gym workout and chose instead to try chiropractic therapy, an inquest heard.