The fire was first reported around 3:15 p.m. at at 106 Lorenzo Drive.
Residents of the first home apparently self-evacuated, and firefighters didn't find anyone inside the second home, according to Contra Costa County Fire. Officials are unsure if the resident was home or not at the time of the fire are are trying to track them down.
The fire is under control, but crews are still watering hot spots.
Officials say the home where the fire started is a total loss and two cars in the garage were destroyed.
The second home was considerably damaged.
A firefighter was taken to the hospital with burns, according to officials. No other injuries were reported.
Officials are asking people not to park in front of the home because of arching powerlines.
Please avoid the area of Beth Dr. and Lorenzo Dr, off of Contra Costa Bl, due to fire and police activity. Thank you. pic.twitter.com/RFaxOrjCve— Pleasant Hill PD (@PHillPD) June 21, 2021
Lorenzo Dr. fire, Pleasant Hill, has now gone to second alarm. House and associated garage fully involved. Primary search on house completed with no one found inside. Shifting to defensive firefight as structure in danger of collapse. Please continue to avoid area. #lorenzoic pic.twitter.com/EfrWO38uXQ— Con Fire PIO (@ContraCostaFire) June 21, 2021
Stay with ABC7 News for the latest details on this developing story.