Crews from the Rodeo-Hercules Fire District and Pinole Fire Department also responded to the structure fire in the 2900 block of Ramona Street. The blaze was reported at about 4:20 a.m.
The first arriving company, a Pinole fire engine crew, reported heavy smoke coming from the front of the one-story home.
Firefighters fought the blaze from the home's interior, where officers found some 250 marijuana plants -- with a street value of about $750,000 -- along with grow lamps and a hydroponics system, police said.
Officers determined that PG&E service to the home had been bypassed.
No one was inside and no injuries were reported.
The fire caused an estimated $60,000 in damage, but firefighters were able to save the home's living space and most of its contents, according to the fire district.
A total of 19 fire personnel responded, including four engine companies, one truck company and two battalion chiefs.
A fire protection district arson investigator and police detectives are investigating the fire's cause and the associated criminal activity, police said.
