The Honolulu Fire Department’s investigator determined the fire that gutted a Kailua house Monday was accidental and originated in the garage from a 32-year-old Jeep.

Neighbors said they heard someone trying to start the Jeep just before the blaze consumed much of the house, located at 136 Kaha St. near Kainalu Elementary School. The son-in-law of one of the owners said he was present at the time, but declined to say what happened.

Owners said the house was vacant and was being prepared for rent or sale.

The fire investigator also estimated the damage to the house was $200,000 and $20,000 to its contents, including the 1983 Jeep CJ-7.