Single-Stair Buildings in LA: Key Risks and Opportunities
Los Angeles may change its building code to let mid-rise residential buildings (up to six stories) use just one exit stairway.
The change is meant to lower housing costs and allow more design options, but it also raises safety, liability, and insurance concerns.
What You Need to Know
In August 2025, the L.A. City Council voted to begin drafting an ordinance that could let apartment buildings up to six stories be built with just one staircase.
For owners and managers, this change could affect how mixed-use and infill projects are built and financed.
For example, while the law focuses on housing, it will also affect projects combining residential, retail, or office space.
How it Impacts You
Key Risks
Life Safety and Egress: One stairwell means fewer escape options, possible crowding in emergencies, and harder access for firefighters.
Insurance and Liability: Insurers may see single-stair buildings as riskier, leading to higher premiums or extra coverage, and owners could face more liability if safety systems fail.
Compliance and Maintenance: These buildings rely more on sprinklers, alarms, and smoke systems, which need careful upkeep. Skipping inspections or maintenance could lead to penalties and risk.
Key Opportunities
Cost Savings in Construction: Removing a second stair saves materials, space, and design costs, which developers may pass to tenants or use for amenities.
More Usable Space: Single-stair designs give more space for bigger units, courtyards, or extra retail.
Mixed-Use Flexibility: Mixed-use buildings with retail or offices below and housing above could become easier to design and adapt.
Stay Connected
LADBS is drafting rules—keep updated at our Codes and Regulations Committee.
Talk to insurers early to see how single-stair buildings affect coverage.
The idea of a one-stairway ordinance and code change aims to expand housing in Los Angeles but adds new responsibilities for owners and managers, especially around safety, insurance, and compliance.
BOMA on the Frontline will keep members updated on how this code change could affect operations, investments, and property value.
