Multiple fire departments and police units responded to the call for a "fire in a computer" around 9 a.m.
The home is located on Sixth Street.
When authorities arrived, there was significant smoke coming from the second floor.
Emera Maine linemen had to shut off power to the home.
Crews later found fire in the walls and floor of the building, but were able to knock it down quickly.
There is a lot of fire and smoke damage to the building, rendering the home uninhabitable.
"This was a hard to get fire, it was a lot of chasing it back and forth," said Captain Matt Redding of the Old Town Fire Department. "The only real issue we had was a lot of the clutter in the house made it very hard to gain access to the third story of the attic area."
The three people home at the time were able to make it out of the building safely with the assistance of fire crews.
One person had to be taken to Northern Light Health for smoke inhalation.
Authorities are now looking to set them up with housing.
Two dogs were also able to make it out safely.