(a) Construction and installation of accessory buildings or structures or building components shall comply with the structural requirements of the California Residential Code, except as otherwise provided by this article. The enforcement agency may require accessory buildings and structures or building components be designed and constructed to withstand live loads, vertical uplift or horizontal forces from any direction in excess of the minimum loads specified in this chapter, based on local geologic, topographic, or climatic conditions, when approved by the department.

(b) Accessory buildings and structures constructed of aluminum or aluminum alloy shall be designed to conform to the specifications contained in the California Residential Code.

(c) Unless data to substantiate the use of higher values is submitted to the enforcement agency, the allowable loading of accessory buildings or structures or building components on the soil shall not exceed one thousand five-hundred (1,500) psf vertical soil bearing pressure, one hundred fifty (150) psf of depth lateral soil bearing pressure, and one hundred sixty-seven (167) psf frictional resistance for uncased cast-in-place concrete piles.