John Fullerton, 33, of Park Lane Apartments in Buncrana appeared at Donegal Circuit Criminal Court.
Fullerton pleaded guilty to arson at Williamson’s Flats at West End in Bundoran on September 12, 2011.
He also pleaded guilty to damaging a car at Magheracar in Bundoran on the same date.
Judge John O’Hagan adjourned sentencing until March 25 and ordered a probation report.
He also asked the prosecution to allow the victims of the incidents to be allowed to make impact statements on that date.