Colorado ADU Law Opens Doors for Douglas County Homeowners in 2026
State law HB24-1152 clears barriers to accessory dwelling units in Castle Rock, Parker, Highlands Ranch, and Lone Tree.
A new Colorado state law is reshaping housing options for homeowners across Douglas County, with a Castle Rock builder calling the 2026-2027 construction season a prime window to add accessory dwelling units to existing properties.
House Bill 24-1152 removes longstanding zoning and regulatory obstacles that previously made it difficult or impossible for homeowners in municipalities such as Castle Rock, Parker, Highlands Ranch, and Lone Tree to build ADUs on their lots. The legislation represents one of the more significant shifts in Colorado residential land-use policy in recent years.
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Limestone Custom Homes, a design-build firm headquartered in Castle Rock, is urging Douglas County homeowners to act during this building cycle, citing the newly permissive regulatory environment as a catalyst for projects that would have stalled under prior rules. The company specializes in custom residential construction and positions itself to guide clients through the redesigned approval process.
ADUs — self-contained living spaces built on the same parcel as a primary residence — have gained attention nationally as a tool for addressing housing shortages, generating rental income, and accommodating multigenerational households. Colorado's legislative move aligns with similar efforts in California, Oregon, and other states that have preempted local restrictions on the unit type.
Whether the regulatory change translates into a broad construction surge in Douglas County will depend on factors including financing availability, contractor capacity, and individual homeowner demand. Continue reading at All Financial Services & Investing.
