Several crews responded to the scene. Firefighters said the time when the fire started is not known but it eventually spread to the attic.
Ada County EMS treated a woman for a laceration on her hand or arm at the scene. The Boise Fire Department told that the woman was not a resident of the house but a neighbor.
The fire has been contained but caused heavy smoke damage.
The Boise Fire Department said the Burnout Fund is helping residents.
The cause of the fire is said to be accidental.