An in-house movement in watchmaking refers to a watch movement that is entirely designed, developed, and manufactured by the watch brand itself, under one roof. This means that every component, from the base plate to the balance spring, is produced by the brand whose name appears on the watch dial. In-house movements are often seen as a mark of prestige and craftsmanship, as they allow brands to have complete control over the design and engineering of their timepieces. This can lead to more cohesive and innovative watches, as brands can tailor movements specifically to their cases and complications. However, the term "in-house" can sometimes be used loosely, with some brands modifying base movements from external suppliers and still labeling them as in-house. True in-house movements are typically associated with brands like Rolex, Jaeger-LeCoultre, and Seiko, which manage nearly every aspect of production internally.