Palmdale, CA Building Safety: Fire Sprinkler Requirements (2026)

040(A)(10), part of the standards for two-unit development created through urban lot splits, ties a fire sprinkler mandate to wildfire risk rather than imposing a blanket citywide requirement: units created through the two-unit development process must be fire-sprinklered if they fall within a very high fire hazard severity zone or high fire hazard severity zone as identified in the General Plan. Outside those mapped zones, a two-unit development is not forced into sprinklers by this section. The companion rule for accessory dwelling units runs the other direction.

010(E)(10) states that ADUs and junior ADUs are not required to include fire sprinklers if sprinklers are not already required for the primary residence, and it cites Government Code § 66314(d)(12) for the separate, state-law point that adding an ADU cannot itself trigger a retrofit sprinkler requirement in an existing primary dwelling. Together the two sections mean sprinkler obligations in Palmdale residential construction track either the parcel's fire hazard severity zone designation (for SB 9 two-unit lots) or whatever requirement already attaches to the primary home (for ADUs), rather than a single fixed citywide mandate. 39 controls.