The fire off 121st Street north of Monroe started in the chimney and spread to the attic, officials said.
It was reported around 11:30 p.m.
No one was injured.
Firefighters reached the blaze in the A-frame home quickly enough to salvage art work and furniture inside.
Eighteen firefighters from Monroe and Snohomish battled the blaze.
No damage estimate was available Tuesday morning.
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