The buildings and the hardware
The mix of properties affects the hardware we see. Older single-family homes bring wooden doors, mortise locks, and sometimes incompatible strike reinforcement that needs stronger sleepers and longer screws; multiunit buildings usually have metal entry doors with cylindrical deadbolts or keyed-alike systems that require careful rekeying to avoid cross-keys. Small storefronts tend to use commercial cylindrical locks, exit device trim, or push-bar hardware that must meet functional use and frequent cycle requirements. Knowing the door construction and the lock mounting is what tells us whether to retrofit a cylinder, fit a new deadbolt, or replace an entire lockset.
