ADU rules in Cary, NC — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Cary has adopted ADU regulations as part of its Housing Plan. ADUs are permitted as accessory dwelling units on residential lots subject to size, setback, and design standards in the LDO.
Cary allows Accessory Dwelling Units as recommended by the Cary Housing Plan. ADUs may be detached structures, attached additions, or conversions of existing space (like garages). ADUs must comply with LDO size limits, typically capped at a percentage of the primary dwelling size or a maximum square footage. Setback requirements apply. ADUs must match the architectural character of the primary dwelling. One ADU is permitted per single-family lot. Building permits are required and ADUs must meet all building code requirements for habitable space including fire safety, electrical, plumbing, and HVAC.
Unpermitted ADUs are subject to code enforcement, fines, and may be required to be vacated or demolished if they cannot be brought into compliance.
Cary, NC
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Side-by-side rule comparisons with other cities in Wake County.
See how other cities in Wake County handle adu rules.
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