California Code, Penal Code - PEN § 451

(a) Arson that causes great bodily injury is a felony punishable by imprisonment in the state prison for five, seven, or nine years.

(b) Arson that causes an inhabited structure or inhabited property to burn is a felony punishable by imprisonment in the state prison for three, five, or eight years.

(c) Arson of a structure or forest land is a felony punishable by imprisonment in the state prison for two, four, or six years.

(d) Arson of property is a felony punishable by imprisonment in the state prison for 16 months, two, or three years. For purposes of this paragraph, arson of property does not include one burning or causing to be burned his or her own personal property unless there is an intent to defraud or there is injury to another person or another person's structure, forest land, or property.

(e) In the case of any person convicted of violating this section while confined in a state prison, prison road camp, prison forestry camp, or other prison camp or prison farm, or while confined in a county jail while serving a term of imprisonment for a felony or misdemeanor conviction, any sentence imposed shall be consecutive to the sentence for which the person was then confined.