State law HB24-1152 removes long-standing barriers for homeowners in Castle Rock, Parker, Highlands Ranch, and Lone Tree
CASTLE ROCK, Colo., Oct. 9, 2026 /PRNewswire/ — Limestone Custom Homes, a Castle Rock-based design-build custom home company, today said the 2026-2027 building season is shaping up as the most favorable window in recent memory for Douglas County homeowners to build an accessory dwelling unit (ADU). Colorado’s HB24-1152, which took effect June 30, 2025, now requires communities including Castle Rock, Parker, Lone Tree, and unincorporated Douglas County to allow one ADU on single-family lots through an administrative approval process, replacing a patchwork of local rules that discouraged many homeowners from moving forward.
Under the new law, qualifying jurisdictions can no longer require additional off-street parking for an ADU in most cases, impose owner-occupancy requirements, or apply stricter design standards to an ADU than to the main home. The law also voids HOA covenants that prohibit ADUs outright, a significant change in HOA-heavy Douglas County, though associations may still apply reasonable design standards.
According to Limestone Custom Homes, Douglas County homeowners pursuing ADUs are typically motivated by a few consistent goals: housing for aging parents or adult children, long-term rental income to offset rising housing costs, home offices and studios, and guest suites. Many plan for more than one, designing a unit for a family member today that can become a rental later.
“Douglas County homeowners have wanted to build ADUs for years. The demand was always there, and the process was the obstacle,” a Limestone Custom Homes spokesperson said. “With administrative approval now the standard, homeowners who had shelved ADU plans are taking a second look. Whether it’s a detached backyard cottage, a garage conversion, or a finished basement with a separate entrance, the path is much clearer than it was two years ago.”
As an ADU builder in Colorado, Limestone designs and builds accessory dwelling units throughout Douglas County and the Denver metro area, managing architecture, permitting, construction, and finish selections with one in-house team from its Castle Rock office.
About Limestone Custom Homes
Limestone Custom Homes is one of Colorado’s leading design-build custom home companies, with offices in Castle Rock and projects across Douglas County, the Denver metro area, the Colorado mountains, and Larimer County. The company specializes in high-end custom homes and ADUs with a fully in-house design, architecture, and construction team. For more information, visit Limestone Custom Homes.
Media Contact:
Limestone Custom Homes
Phone: (720) 477-7157
Website: https://limestonecustomhomes.com
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SOURCE Limestone Custom Homes
