In the R-1-C residential district of unincorporated Adams County, principal structures need a 20-foot front setback, 17/5-foot side setbacks, and a 15-foot rear setback. Agricultural (A-1) districts require a 30-foot front setback.
Adams County DSR Section 3-13 sets R-1-C principal-structure setbacks: minimum front 20 feet, side corner 20 feet, side 17 feet on one side (or 5 feet from an attached garage) and 5 feet on the other, and rear 15 feet (20 feet if the rear fronts a right-of-way). Accessory structures in R-1-C use 5-foot side and rear setbacks. R-2 uses the same 20/15-foot pattern. Agricultural-1 (Section 3-08) requires a 30-foot front, 10-foot side, and 20-foot rear setback for principal structures, with larger arterial and section-line setbacks. Incorporated cities set their own setbacks.
Structures encroaching into required setbacks are zoning violations; the owner must obtain a variance (residential fee $500) or bring the structure into compliance. County zoning violations are a misdemeanor under CRS 30-28-124.
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