Most of our brick in letterboxes are designed to fit standard size bricks. There is the odd exception where your brick-layer may have to cut down bricks in order to fit the letterbox.
Our expandable brick-in letterboxes can fit one brick deep (230mm) pillar up to a maximum depth of two bricks deep (470mm).
Our combo letterboxes have a fixed depth which either fit one brick (230mm) or one brick and a half (350mm) deep pillars.
Please refer to each individual product listing to see specifications.