Extend-a-Box

The future of Built-in Letterboxes

Crafted with innovation and practicality in mind, Extend-a-box is a registered design that redefines built-in letterboxes.

• Fully assembled & Adjustable - Expands effortlessly from 200mm to 480mm in depth, offering unmatched flexibility.

• Versatile for Any Installation - Whether into brickwork, blockwork, cavity walls, or other structures, one letterbox does it all.

• Built for Builders - Designed as the ultimate time-saving, adaptable mailbox solution for professionals.