Porterville, CA Accessory Structures: Garage Conversions (2026)

Section 301.16(A)(8) sits among the general development standards that apply to every type of accessory dwelling unit in Article 301 of Porterville's Development Ordinance. It targets a specific problem: when a garage, carport or other structure that used to provide off-street parking becomes living space, the paved driveway and curb cut leading to it are still there, and the City is barred from mandating their removal just because the parking use is gone. The rule works alongside two related conversion provisions in the same section.

Under 301.16(C)(6)(c), no replacement parking space has to be provided at all when a detached accessory dwelling unit is created by converting an existing accessory structure. Under 301.16(C)(3)(c), the usual 1,200-square-foot cap on a detached unit's floor area does not apply to a conversion either, letting the new unit equal the full square footage of the accessory structure being converted, and 301.16(C)(5)(c)(2) allows the converted unit's height to exceed the base limit up to the existing structure's height. Together, these standards mean a homeowner converting a garage keeps the existing driveway, foundation, footprint and height of the structure largely intact rather than having to demolish hardscape or downsize to fit a new-construction limit.

The whole ADU package, including this driveway protection, was adopted by Ordinance 1909, effective January 21, 2025. The Community Development Department still reviews the conversion under the adopted building code to confirm habitability, but that plan review cannot include a condition requiring the driveway or approach to be torn out.