The design-consistency requirement, and the tension in it

The ordinance requires an ADU to be “consistent with the design of the principal dwelling unit by use of similar architectural style(s), exterior wall material(s) and color(s), window type(s), door and window trim(s), roofing material(s) and roof pitch and color(s).”

Where a site development plan, planned unit development plan or overlay district has single-unit design requirements, “Proposed ADUs … shall be required to meet those design requirements.” Where there are none, at least 50% of exterior wall surfaces must be clad in material similar to the principal structure, and street-facing walls must be at least 50% matching material or colour.

Worth naming without resolving: HB24-1152's preemption at C.R.S. 38-33.3-106.5(4) bars association restrictions on ADUs in designated jurisdictions that go beyond a “reasonable restriction” — one that does not unreasonably increase cost, effectively prohibit construction, or extinguish the ability to build. Colorado's ADU statutory scheme also constrains restrictive design or dimension standards that are more restrictive for an ADU than for a single-unit detached dwelling in the same district. Broomfield's match standard is a city standard, not an association standard, so the preemption does not speak to it directly. But an association in Broomfield now faces the odd position that the city imposes design requirements the association may be limited in imposing itself. We report the tension; we do not resolve it, and it is a question for counsel on a specific application.

The rest of the standards

Utilities: except telephone, television, electrical and internet, the ADU “must be served through the utility services of the principal dwelling unit and shall not have separate services.” Septic-served lots need Broomfield Department of Public Health and Environment review of capacity.

A recorded declaration of use: “All property owners shall record a declaration of use which will state the size and location of the accessory dwelling unit and shall reference that the accessory dwelling unit must remain in compliance with the regulations … For detached accessory dwelling units this declaration shall be recorded prior to the issuance of certificate of occupancy.”

That is a covenant running to the city, not to an association — a point worth clarifying for owners who will see the word “declaration” and assume it concerns the HOA.

Housing types: mobile homes, travel trailers, recreational vehicles, and shipping and storage containers are prohibited as ADUs. Manufactured homes and tiny homes are permitted on a compliant IRC foundation, clad to match. The ordinance adds definitions for Manufactured Home, Mobile Home, Modular Home, Tiny Home (“permanently constructed on a vehicle chassis, is 400 square feet or less … certification by the State of Colorado Department of Local Affairs, Division of Housing”) and Tiny House (“400 square feet or less in floor area excluding lofts … placed on a permanent foundation and has no chassis”).

Where a Broomfield board stands

Read the association's approved-materials and colour palette against the city's 50% match rule before the first application. Where the two are compatible, the association's review adds nothing an owner will resent. Where they conflict, the owner is caught between two reviews and the board will be the one blamed.

Tell owners the STR answer up front. It is the question they will ask first, and the answer is the city's, not the board's.

Do not rely on the recorded declaration of use as association enforcement. It runs to Broomfield. If the association wants a covenant obligation about the ADU's use or maintenance, that has to come from the association's own documents.

One reading caveat, and what is coming

The version of Ordinance 2265 reviewed for this article is a redline, and strike-through formatting is lost when such a document is extracted to text. It shows the former owner-occupancy requirement — “The property owner shall be required to occupy as their primary residence either the principal structure or the accessory dwelling unit on the lot” — and a two-person maximum occupancy provision positioned as struck, with the short-term rental prohibition renumbered up. Anyone quoting the repeal of owner-occupancy should confirm against the final codified Broomfield Municipal Code § 17-32-160 rather than the redline.

Separately, the wildfire code is heading for Broomfield boards. Broomfield has publicly discussed the Colorado Wildfire Resiliency Code with an adoption lead time, which gives associations there roughly a year of warning that a requirement for noncombustible hard surfaces in the first five feet around a structure is heading for their landscape rules — the same requirement that took effect in Jefferson County on July 1, 2026.