Garage conversion rules in Castle Rock, CO — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage into finished living space or an ADU requires a building permit in Castle Rock, submitted through the eTRAKiT Development Portal. If the converted space becomes a separate dwelling unit, it must comply with the Chapter 17.61 ADU rules, including the one-per-lot limit and recorded deed restriction.
A garage conversion changes the building's use and must meet the adopted International Residential Code (Title 15) for habitable space plus Title 17 zoning. If the conversion creates a second, self-contained dwelling unit, it is treated as an ADU under Chapter 17.61: only one ADU per lot, a recorded deed restriction against concurrently renting both units, and no separate water/sewer taps. Building permits are submitted and approved online through the Town's eTRAKiT Development Portal; contractors must be registered with the Town. Off-street parking and setback standards still apply.
Converting a garage into living space without permits, or creating an unpermitted second dwelling, is a code violation subject to Town enforcement and orders to correct or restore.
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