Update 6.12pm: One of the men was named locally as William Vaughan, 76, who was known as Charlie and owned the house, and the other man was John Paul Flood, 33.
Mr Flood, who was from the area but was not related to Mr Vaughan, is understood to have been living in the house.
One of the men was found inside near the front of the house and the other near a bathroom.
Post-mortems are due to take place at Naas General Hospital tomorrow.
Two men have died in a fire at a house in Co Kildare.
The alarm was raised in Tully East, Kildare Town, at 2.40am this morning.
Three units of the fire service attended the scene and the bodies of two men, one in his 70s and one as his 30s, were discovered in the house.
An investigation has been launched in to the cause of the fire.
The scene has been preserved for technical examination.