HSC § 18908

(a) “Building” means any structure used for support or shelter of any use or occupancy. “Structure” means that which is built or constructed, an edifice or building of any kind or any piece of work artificially built or composed of parts joined together in some definite manner, except any mobilehome as defined in Section 18008, manufactured home, as defined in Section 18007, special purpose commercial coach, as defined in Section 18012.5, and recreational vehicle, as defined in Section 18010.

(b) “Building” includes a structure wherein things may be grown, made, produced, kept, handled, stored, or disposed of.

(c) All appendages, accessories, apparatus, appliances, and equipment installed as a part of building or structure shall be deemed to be a part thereof.

(d) “Building” does not include machinery, equipment, or appliances installed for manufacture or process purposes only, any construction installations which are not a part of a building, or any tunnel, mine shaft, highway, or bridge.