ADU rules in York County, SC — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
York County allows an accessory dwelling unit subordinate to the main home on the same lot. It needs a building permit under the 2021 SC Residential Code, zoning review, and, off public sewer, a SCDHEC septic permit.
York County defines an ADU as a secondary dwelling clearly subordinate to the primary dwelling on the same lot, attached or detached. Planning & Development Services reviews the plans under the 2021 SC Residential Code, and Zoning staff check setbacks and use. The ADU permit requires a site plan with all four setbacks and, before issuance, either a paid water and sewer tap receipt or a SCDHEC septic permit. Off public sewer, SCDHEC Regulation 61-56 controls the onsite system, and the septic tank is sized by bedroom count. All contractors must be SC-licensed.
Building an ADU without the county permit is illegal construction. Occupying one on septic without an approved SCDHEC onsite wastewater permit violates Regulation 61-56 and can force disconnection.
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