The mandate, which took effect in mid-2025, strips away the restrictive local ordinances that previously discouraged development. Municipalities can no longer enforce additional off-street parking requirements or demand owner-occupancy as a condition for building an accessory dwelling unit. Perhaps most significant for the region is the law’s impact on homeowners associations; while HOAs retain the right to enforce reasonable design standards, they are now prohibited from issuing outright bans on these structures.
Colorado ADU Law Opens Door for Douglas County Homeowners
Colorado’s HB24-1152 has dismantled the regulatory hurdles that once stifled secondary residential construction in Douglas County. By forcing local jurisdictions to adopt streamlined administrative approvals, the law has effectively turned 2026 and 2027 into a prime window for homeowners in Castle Rock, Parker, and beyond to finally break ground.
Limestone Custom Homes, a Castle Rock-based firm, reports a sharp increase in interest from residents looking to leverage the change. Homeowners are increasingly viewing these units as versatile assets, whether for housing aging relatives, generating rental income to combat rising costs, or creating dedicated workspaces. With the administrative process now standardized, the company notes that projects previously considered unfeasible due to permitting complexity are moving forward. From backyard cottages to basement conversions, the path to expansion in Douglas County is no longer buried in local red tape.
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