City Council Looks At Littleton ADU (Accessory Dwelling Units)

The City of Littleton is taking meaningful steps toward expanding housing options by introducing ordinances that would allow Accessory Dwelling Units (ADUs) to be built more freely within city limits. These small, independent living spaces, often referred to as “granny flats,” “in-law suites,” or carriage houses, are located on the same lot as a primary residence and are growing in popularity due to their flexibility and potential to ease housing shortages.

Littleton City Council Discusses ADUs

At its regular meeting on May 20, 2025, the Littleton City Council held a first hearing for Ordinance No. 09, Series 2025, which would amend the city’s Unified Land Use Code to allow ADUs in residential zones. This proposed change seeks to align local zoning regulations with Colorado House Bill 24-1152—a 2024 state law mandating that municipalities accommodate ADUs to help address the state’s growing housing crisis.

According to Andrea Vaughn, Littleton’s Senior Planner, HB 24-1152 is intended to support aging populations and provide more affordable, flexible housing solutions. The proposed ordinance follows significant community engagement, including planning commission sessions, community surveys, and technical consultations between June 2024 and March 2025. On May 12, the Littleton Planning Commission unanimously recommended the amendments for City Council approval.

Key Ordinance Updates

If adopted, the ordinance would bring several important changes:

• ADU maximum size increases from 750 sq ft to 1,000 sq ft

• Parking requirements for ADUs are removed

• Design standard restrictions are eased to match primary housing

• Detached ADUs can be built on lots without alley access

• The definition of “contained” ADUs is replaced with “attached”

• ADUs can now be built up to the height allowance of the zone district

These adjustments are expected to enhance housing diversity, support intergenerational living, and allow families to better meet changing housing needs—whether for aging parents, adult children, or as income-generating rentals.

Sustainable Design Build: Local Expertise in ADUs

For years, Sustainable Design Build has been at the forefront of building ADUs in Littleton, well before statewide mandates were enacted. With a proven track record in custom home additions, pop tops, and whole home remodels, SDB has cultivated a deep understanding of Littleton’s zoning nuances and residential infrastructure.

SDB’s familiarity with the city’s evolving regulations makes them an ideal partner for homeowners interested in exploring how an ADU might enhance their property. Whether it’s creating a private residence for aging relatives, a separate unit for young adults, or a short-term rental to boost household income, SDB can guide residents through every phase of the process—from design, to permitting, to construction.

Tailored Solutions for Evolving Needs

In a housing landscape where flexibility and sustainability are paramount, SDB recognizes that every property and family has unique needs. Their experienced team helps residents:

• Understand what types of ADUs are feasible on their lot

• Navigate updated building codes and city processes

• Design spaces that serve both functional and aesthetic goals

• Consider intergenerational living options that support family care and connection

• Explore home additions or other creative alternatives when ADUs aren’t the right fit

Looking Ahead With Sustainable Design Build

With final approval of Littleton’s ADU ordinance scheduled for June 3, 2025, now is an excellent time for homeowners to consider how they might take advantage of these new opportunities. Sustainable Design Build stands ready to help residents not only comply with these new rules but to create beautiful, functional spaces that serve their families for generations to come.