ADU Ledger
ADU Ledger / Colorado / Centennial

Is Centennial complying with Colorado's ADU law?

✓ Verified against code · August 20, 2026

The state says no. In October 2025 Colorado's Department of Local Affairs identified Centennial among roughly a dozen jurisdictions not complying with HB24-1152, as part of a review tied to grant eligibility under the governor's executive order. Two provisions are the likely reasons: Centennial requires an off-street parking space unconditionally, where the statute permits a parking requirement only under three narrow conditions, and its size formula can fall below the 500 to 750 sq ft range the statute protects. We checked the city's June 2026 ordinance directly and it does not fix either provision.

Citation: DOLA October 2025 compliance review; LDC §12-3-603(H)

How current is this?

Centennial’s ADU rules run under Land Development Code §12-3-603(H) (Ordinance 2024-O-03). Centennial adopted its ADU ordinance in May 2024, a year before Colorado's June 30, 2025 deadline — and then did not revisit it. In October 2025 the state identified Centennial among roughly a dozen jurisdictions not complying with HB24-1152. Two provisions stand out: an unconditional parking requirement that matches none of the statute's three conditions, and a size formula tied to the principal dwelling's footprint with no floor at the 750 sq ft the statute protects. We checked Ordinance 2026-O-07, adopted June 2, 2026, directly: it amends sixteen provisions and none of them touch the ADU or parking sections. We verified this answer against primary sources on August 20, 2026, and every change we catch is logged in the changelog.

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Not legal advice — lot-specific overlays can change the answer for your parcel. The citation above points at the governing code section; check it, or ask the city to confirm.