Ajinkya Nikalje allegedly set the hall and bedroom in his house on fire and then hanged himself from a ceiling fan around 9 am yesterday when he was alone, an official at the Kalwa police station said.
The man's parents had gone out when the incident took place, police said.
The Thane Municipal Corporation received a call about a fire in the flat following which its personnel rushed there, TMC's regional disaster management cell chief Santosh Kadam said.
They found Nikalje hanging with a rope tied to the ceiling fan in the kitchen, Kadam said.
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According to police, the deceased was pursuing a hotel management course and had failed in it because of which he had slipped into depression and was undergoing treatment.
The deceased's parents had reportedly lodged a non-cognisable offence against their son two days back when he allegedly assaulted them.
The body was sent for postmortem, police added.