Planning Commission backs ADU and other 2024 legislative code updates; narrow size debate fails

The Littleton Planning Commission voted 7‑0 to recommend that city council adopt code text amendments implementing 2024 state legislation and related local adjustments for accessory dwelling units (ADUs), nonfunctional turf, and minimum parking requirements.

Staff summarized state requirements — including House Bill 24‑1152 on ADUs, HB 24‑1007 on occupancy limits, Senate Bill 24‑005 on nonfunctional turf, and HB 24‑1304 on minimum parking near high‑frequency transit — and proposed local code edits to bring Title 10 (the Unified Land Use Code) into compliance while also reducing administrative barriers to ADU construction.

Why it matters: The changes alter where and how ADUs can be built (state law requires municipalities to allow ADUs where single‑family detached homes are permitted and limits certain local restrictions). The commission also weighed removing parking minimums for residential projects near high‑frequency transit and stricter limits on nonfunctional turf for nonresidential properties. The package implements state law while proposing local clarifications and modest expansions (for example, staff recommended a 1,000‑square‑foot cap for detached ADUs and allowing ADU height up to the zone district maximum in some situations).

Key items and staff proposals - ADUs: Staff proposed condensing attached/contained ADU types into a single attached/contained category, removing several prescriptive design standards (to comply with state law), allowing detached ADUs up to 1,000 square feet (staff said the increase is intended to enable two‑bedroom layouts), and permitting ADU height up to the zone district maximum in certain cases (staff argued this helps property owners who want to build above existing accessory structures). Staff proposed narrowing buffer‑yard reductions for detached ADUs after public comment and ultimately removed a proposed rule that would have broadly allowed planting reconfiguration that community members said might affect neighborhood visuals. - Parking and transit: State law requires removal of minimum parking for certain multifamily or mixed‑use projects near high‑frequency transit. Staff recommended expanding the exemption to all residential developments within the state’s applicable transit area map to create more consistent treatment across different residential building types in transit areas. - Nonfunctional turf: For nonresidential properties staff proposed definitions and prohibitions consistent with SB24‑005 to restrict installation of nonfunctional turf (including artificial turf) on nonresidential properties; functional turf (athletic fields, parks) would be exempt. - Occupancy: The code amendments remove language that limited manufactured homes to a single family and align municipal occupancy rules with HB 24‑1007; Littleton already removed a restrictive family definition in 2021 and retains health‑and‑safety‑based occupancy limits.

Public comment and concerns Speakers at the hearing and numerous written comments expressed concern about potential parking impacts, neighborhood character and visual effects, and the proposed 1,000‑square‑foot cap for detached ADUs. Several public commenters urged a smaller maximum (for example, 850 square feet). Staff and some commissioners cited data and experience from other jurisdictions showing ADUs typically are smaller than the proposed maximum and that uptake tends to be modest (Portland and Denver examples were mentioned). Staff also said that lot size, setbacks, maximum building coverage and other code constraints limit how many properties could actually build large ADUs.

Commission discussion and amendment attempt Commissioners debated whether to lower the staff‑proposed detached ADU maximum from 1,000 to 800 square feet. An amendment to reduce the maximum to 800 square feet was proposed and failed on a 2‑5 vote. Commissioners discussed tradeoffs among neighborhood concerns, potential parking demand, household size, and the rarity of ADU construction in practice. Several commissioners said project costs, lot constraints and other regulations make widespread construction unlikely.

Formal action The Planning Commission voted to recommend city council approve PC Resolution 02‑2025 (ADU code amendments) and PC Resolution 03‑2025 (2024 legislative updates). Motions passed and the commission recorded unanimous votes (7‑0) for each final recommendation.

Quotes (from meeting transcript) “We hope to prevent that level of [housing crisis] here in Colorado and in Littleton.” — Chair Reynolds (paraphrasing a policy rationale)

“If we do not get a rezone by July, we will not be able to apply for low income housing tax credits … They are a threshold item.” — Sarah Burr, South Metro Housing Options (note: discussed in the rezoning item)

“I also would like to say that the cost of building something like this is probably the most restrictive thing there is. The larger you get, the harder it's going to be.” — Commissioner (public comment during ADU discussion)

Ending Planning Commission recommendations now go to City Council for final action. The council and further public engagement will determine final code language and whether the city adopts staff’s suggested size and height flexibilities for ADUs and the staff‑proposed scope of parking and turf changes.