A resident returned to find her home on Zylstra Road full of smoke Monday afternoon and then again that evening. Fire officials are still investigating the fire’s origin.

Karla Baxley said she called Puget Sound Energy about a downed power line near her home, left and returned to find the structure on fire. Her dog managed to get the door open and go onto the balcony, where Baxley’s boyfriend retrieved it. No one else was inside.

North Whidbey Fire and Rescue arrived around 2:30 p.m. to find flames coming from the back part of the residence, said Battalion Chief Chris Swiger.

Central Whidbey Island Fire and Rescue and Navy region Northwest Fire and Emergency Services provided mutual aid.

Damage was limited to one room with extreme heat and smoke damage, Swiger said.

Firefighters extinguished the initial flames in about five minutes and spent another hour on overhaul. However, the old home had been modified over the years, and the fire had gotten into a gap between an add-on and the original structure.

Shortly after 6 p.m., North Whidbey Fire returned to site to find more flames, Swiger said. Personnel completely extinguished the flames within a few minutes and stayed another 20 minutes to ensure all embers were put out as well, Swiger said.

Fire personnel returned Tuesday morning to investigate the cause.