Bay
A bay is a regular division or unit of space within a building's structure, typically defined by the distance between vertical supports such as columns, piers, or walls. This fundamental spatial configuration serves as a modular unit that helps organize interior layouts and establishes a rhythmic pattern across a building's facade. In residential architecture, bays often manifest as projecting window assemblies—such as bay, bow, or oriel windows—that extend beyond the main exterior walls to increase floor area, enhance natural light, and provide more expansive views. Beyond its structural role in managing spans and load distribution, the bay functions as a versatile design element that can define specific functional zones like reading nooks, stair landings, or workstations within a larger room.

