Council tightens rear-yard rules for accessory structures, votes to amend zoning code

Manhattan Beach moved to revise its accessory-structure setback rules after staff presented code amendments intended to prevent new accessory structures from being constructed essentially at property lines.

Associate planner Marisella Guen explained that the proposed amendment to MBMC section 10.52.050D eliminates the prior allowance for zero-foot side or rear setbacks for accessory structures in most single-family zoning districts. The code replaces the zero-foot allowance with a minimum three-foot rear and side setback for accessory structures that require building permits; alley lots and properties abutting commercial zones have specified exceptions.

Guen said the planning commission recommended approval after study sessions and a public hearing. The ordinance retains existing 10-foot building separations and most ministerial review processes to reduce administrative burden. "Accessory structures that do not qualify for a building permit, such as small sheds without utilities, would be exempt," Guen said.

Council members sought clarification about legal nonconforming structures, ADU conversions and how additions would be handled; staff said existing legal nonconforming accessory structures would be preserved but additions would need to comply with the new setbacks. City attorney read the ordinance title and the council voted 5-0 to adopt Ordinance 25-00012 amending MBMC 10.52.050D.

The ordinance directs staff to update zoning enforcement materials and return with any implementing procedures. It does not affect accessory dwelling unit (ADU) regulations that follow state ADU rules.