The fire broke out just after 1:30 p.m. in the 1500 block of Talbot Road South, Renton fire officials said. No one was hurt.
Fire officials originally said the home was unoccupied, but Renton Police say their officers were serving the 45-year-old homeowner with a domestic violence protection order on behalf of the homeowner's wife when the fire started.
The homeowner was arrested at the scene. Officers warned firefighters they had been at the home before and knew there were guns and ammunition inside the home.
There is no word yet on how the fire began.