The fire was reported at 7:34 a.m. Tuesday in the 300 block of Zinfandel Lane in St. Helena, according to Pete Muñoa, Cal Fire battalion chief and Napa County fire marshal.
The 2,800-square-foot home was undergoing renovation, Muñoa said. An electrician who came to work on the residence discovered the fire and called 911.
Muñoa said units and firefighters from St. Helena City Fire, Napa County Fire, Cal Fire and Calistoga Fire Departments responded to the incident.
The fire was contained at 9:40 a.m. but Muñoa said units remained at scene until 12:30 p.m.
He said the fire is believed to have originated in the subfloor beneath the hallway and bathroom area. The home was not occupied due to the construction work and no injuries were reported.
Muñoa said that damage is estimated at $250,000 with an estimated structural save of $1,000,000.
Investigators from the Napa County Fire Marshal’s Office are working on determining the cause.
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