Firefighters arrived on the scene after the man started the destructive inferno with a lighter and a can of spray paint. The man initially attempted to battle the blaze himself, but fled from the home after the flames got out of control.
Emergency crews initially had to fight the fire from a distance because there was live ammunition in the home.
The fire was finally extinguished, but not before causing about $60,000 in damage, Kyle Moore of the Seattle Fire Department told KOMO.
The Red Cross is finding temporary housing for the residents of the house.
It's unclear if the man will face charges like a Kansas woman who attempted something similar.