Orcas Fire responded to a guest house fire around 9 a.m. on March 16 on Pea Pod Lane in the Sea Acres area.
No one was injured in the blaze; all occupants were able to evacuate. The main home was saved after firefighters extinguished the fire in the guest house, which is totalled. It stands only a few feet from the primary residence.
"The house would have caught fire in a matter of minutes if we hadn't arrived when we did," Fire Chief Kevin O'Brien said.
Initially called in as a chimney fire, the cause of the structure fire is unknown. Fire Marshal Paul Turner speculated it was a plug-in heater.
"We'll probably never know," he said.