Fire crews were first called to the house, located along State Route 203 south of Monroe, just after 5:30 p.m. The homeowners were working across the highway when they noticed smoke coming from their two-story home.
Firefighters from Monroe, Duvall, Maltby and Sultan arrived moments later and were eventually able to extinguish the blaze. They had to shuttle water from Duvall because there are no fire hydrants in the area, according to Monroe Fire Marshal Mike Fitzgerald.
While fighting the fire, three firefighters were injured and taken to Valley General Hospital in Monroe.
One man was treated for heat exhaustion and released. The second man suffered a head injury and will likely have to spend the night in the hospital.
The third injured firefighter hurt his hand and was also evaluated at Valley General Hospital.
None of the people who live at the house were injured, but the home is now uninhabitable. The Red Cross is on scene providing assistance.
The Snohomish County Fire Marshal is now investigating what caused the fire.
SR 203 was closed to traffic for several hours after the fire.