Interlocking retaining wall blocks are good for building a solid wall without mortar. Some blocks are made with flanges that slip over the rear edge of the preceding course; others rely on a system of pins.

We’ll explain how to build a retaining wall with interlocking concrete blocks in 11 steps, cover factors to consider before you break ground, and introduce you to our extensive collection of heavy-duty Unilock concrete blocks for your retaining wall.

In this DIY tutorial, I demonstrate how to build a retaining wall using interlocking landscaping blocks, step by step. I’ll cover everything you need to know so you can get started with confidence. First, here’s a quick image that sums up what it takes to build a retaining wall.

These simple engineering features make Allan Block retaining walls the most efficient and reliable products on the market. Mortarless technology works. Building “flexible” structures with interlocking dry-stacked materials provides superior performance over rigid construction techniques.

Interlocking retaining wall block can be stacked to build walls up to 24 to 36 inches high, depending on the size of the block. Follow the block manufacturer's instructions for wall height limits. Plan your layout.