Simi Valley, CA Building Safety: Door Locking Hardware (2026)

05. 11 requires that once an owner or proprietor occupies a building, each separate unit built under the same development permit must use lock combinations that are interchange-free from every other unit, business, or occupancy in that development, so one master key cannot open unrelated units. 12 governs door frames and hinges: jambs need solid backing with no void within six inches of the strike, wood framing needs horizontal blocking at lock height for three stud spaces on each side, and hinges on out-swinging doors must have non-removable pins or a mechanical interlock so the door cannot be lifted off from outside by pulling the hinge pins.

15, covering residential buildings specifically, requires every exterior swinging door, including the garage-to-dwelling door, to carry a single-cylinder deadbolt with at least a one-inch bolt projection built to resist cutting-tool attacks, a three-quarter-inch strike embedment, a cylinder guard, a minimum five-pin tumbler, and connecting screws at least a quarter-inch in diameter; an interconnected lockset that retracts both deadbolt and latch with one motion may substitute if it meets the same specifications. Front doors need a 180-degree door viewer mounted no more than 58 inches up, and glazing within 40 inches of a lock must be tempered or burglary-resistant. Landlords must rekey a rental unit's lock to at least 25,000 possible combinations every time a tenancy changes. 10.