Shed permit rules in Castle Rock, CO — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Sheds and other detached accessory buildings are governed by Castle Rock's Zoning Code (Title 17). Accessory buildings must sit behind the primary home in the rear yard, meet reduced side/rear setbacks, and are capped at a lower height than the main house. Larger sheds also need a building permit.
Under Title 17 zoning, a detached accessory structure is placed in the rear yard and is limited in height (about 20 feet in the R-1 single-family district, versus 35 feet for the principal building). Accessory buildings located in the rear one-third of the lot may sit closer to the side lot line than the main house. Whether a specific shed needs a building permit depends on size and construction under the adopted International Residential Code (Title 15); the Town's Development Services Building Counter (720-733-3527) confirms permit thresholds. HOA covenants may impose stricter limits than Town code.
A shed placed in a required setback, over the height limit, or built without a required permit is a violation subject to correction orders and possible removal.
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