Humboldt County, CA Accessory Structures: Shed & Carport Rules (2026)

Humboldt County does not have a separate shed-specific ordinance; sheds and other small accessory structures are regulated under the California Building Code (CBC) as adopted by reference in Humboldt County Code section 331-11, plus the zoning setbacks that apply to accessory buildings in each district. ' Permit-exempt status does not excuse zoning compliance; the shed must still meet the underlying zone's setbacks, height, and lot-coverage standards. Section 314-43 of the Inland Code states that accessory buildings are permitted as appurtenant to any permitted use, but on residentially-zoned property (RS, R-1, R-2, R-3, R-4) and in Unclassified (U) Zones designated for residential use, no accessory building may be erected and no accessory use conducted until the main building is erected and occupied (or unless a Special Permit is secured).

Sheds and other detached accessory buildings on parcels 1 acre or larger are also subject to the Humboldt County Fire Safe Regulations defensible-space setback in section 3115-2: a 30-foot setback from all property lines and the road centerline, except that a detached accessory building constructed of non-combustible or fire-resistive materials may be located within the 30-foot setback if it is at least 20 feet from any other building. ) requires the relevant trade permit, even when the shed itself is permit-exempt.