Firefighters arrived shortly after 11:15 p.m. Wednesday to a house fire in the 4500 block of 43rd Street Northeast.
They found smoke coming from the upper level of a two-story home there, and crews put out the blaze and searched the 1,700-square-foot house.
No one was home at the time of the fire, and no one was injured, according to Tacoma Fire.
The likely cause of the fire was the spontaneous combustion of rags, damp with paint thinner, that had been discarded, the agency said.
The estimated damage is $28,000.