The fire was first reported over the radio at approximately 2:46 a.m. at 14945 Clement Drive, across from Old Highway 53.
Lake County Fire responded, and requested mutual aid from Northshore Fire Protection District, which sent units including an engine and a water tender from its Clearlake Oaks station, radio traffic indicated.
South Lake County Fire also was reportedly sending an engine to the blaze, and Pacific Gas & Electric was called to respond.
Reports from the scene indicated the fire was mostly contained at approximately 3:42 a.m., with firefighters beginning mop up.
There was no word from the scene early Monday about injuries, the damage to the structure or its cause.
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