Residents of the Kingstowne North Apartments fled from their burning building at about noon Friday.
Smoke was pouring from the bottom floor of the far right unit when firefighters arrived at 1155 Boulevard near Clay Avenue.
Macon-Bibb Assistant Fire Chief Cliff Rushin said firefighters aggressively attacked the flames and quickly put out the blaze.
Fire investigator Sgt. Ben Gleaton said the fire appears to have started in the central heating unit in a utility closet and spread to another unit.
Three of the five units in that building were occupied.
One tenant had just paid rent, but had not yet moved in, said Capt. Tom Musselwhite of the Macon-Bibb Fire Department.
All of the apartments suffered smoke damage, Gleaton said.
No one was hurt, Rushin said.