The fire was reported around 10 p.m. in the 17900 block of 82nd Drive NE.
Arlington fire crews found the home in flames.
They fought the fire defensively, deputy chief Tom Cooper said.
The estimated loss from the fire is $65,000.
The Snohomish County Fire Marshal and Arlington police are investigating, police spokeswoman Kristin Banfield said.
"At this time, arson is suspected as the cause," she said.
The house is in the Magnolia Meadows neighborhood where developer Encore Homes is building 30 homes. The homes average about 2,500 square feet of living area.
Investigators also discovered signs of two other attempted fires in nearby homes that were under construction, Banfield said.
The development is north of 172nd Street and west of Highway 9.
There was no sign the fire is connected to any kind of domestic ecoterrorism group, Banfield said. Federal officials suspect such a group was responsible for setting fires to luxury homes near Maltby in 2008.
Firefighters from rural Arlington, Silvana and the Marysville Fire District also responded to the Arlington blaze.
Anyone with information about the fire is asked to contact the Arlington Police Department at 360-403-3400.
There is a cash reward for information leading to the apprehension of a suspect.
Eric Stevick: 425-339-3446, email@example.com.
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