A rim lock is a traditional surface-mounted locking mechanism that sits on the inside face of a door rather than being installed within the door itself, making it a distinctive feature often found in historic and heritage-inspired homes. The article explores the origins of rim locks, explains how they function, and highlights why they remain valued today for their craftsmanship, character, and architectural authenticity. It also outlines the different types of rim locks and key considerations when selecting one, including door configuration, handing, and intended function. Finally, the post demonstrates how modern rim locks, such as Baldwin’s colonial-inspired designs, combine period-correct aesthetics with the quality, security, and durability expected in contemporary luxury hardware.