ADU rules in Castle Rock, CO — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Castle Rock allows accessory dwelling units, but no more than one ADU per lot. Before a building permit issues, the owner must record a deed restriction barring rental of both the primary home and the ADU at the same time, and no separate water/sewer taps are permitted.
Chapter 17.61 of the Town Zoning Code governs ADUs. One ADU may be created or maintained on a single lot. An ADU may not be subdivided or conveyed into separate ownership from the primary dwelling. If an addition creates a new outside entrance, only one entrance may be visible from the addressed street; any additional entrance must be on the side or rear. No separate water or sewer taps are allowed, and the primary-dwelling account holder must certify responsibility for the ADU's utility charges. Apply through the Town's eTRAKiT Development Portal via Development Services.
Building without a permit or without the required recorded deed restriction is a zoning-code violation subject to Town Code Compliance enforcement, stop-work, and correction orders.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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