Brick sizing plays a crucial role in construction, influencing both the aesthetics and structural integrity of buildings. Bricks are defined by three dimensions: width, thickness, and length. They are commonly designed to fit modular measurements, typically in multiples of 4 inches or 8 inches in width, to facilitate uniform construction and compatibility with other building materials.

Modular bricks are the most common type and are sized to include the mortar joint, which is essential for bonding in masonry construction. The nominal size of a brick refers to its dimension including this mortar joint. Various types of bricks, such as Engineer Modular, Closure Modular, Roman, Norman, Utility, and Meridian, cater to different structural and aesthetic needs.

Utility bricks, for example, are larger, typically measuring about 4 inches in height and 12 inches in length. Their size advantage reduces the number of bricks needed for masonry, thereby lowering labor costs and enhancing the wall's compressive strength by minimizing the use of mortar. A single utility brick covers the same area as four and a half modular bricks, impacting the visual perception of the wall's scale.

Custom-sized bricks are often produced for unique detailing. These special bricks help in achieving the specific visual and functional outcomes desired in unique constructions, allowing for greater flexibility in design while addressing specific structural requirements.