How To Build A Block Wall

Building a block wall can seem like a daunting task, but with the right tools and guidance, it can become a manageable project. In this article, we will guide you through the steps on how to build a block wall.

Step 1: Plan and Prepare

Before beginning any construction project, it is essential to plan and prepare. Start by determining the dimensions of the wall you want to build. Consider the height and width, as well as any curves or corners.

Gather the Necessary Materials

You will need the following materials to build a block wall: concrete blocks, mortar mix, rebar, gravel, and sand. You will also need tools such as a trowel, level, measuring tape, and a rubber mallet.

Step 2: Lay the Foundation

The foundation of your wall is crucial to its stability. Begin by digging a trench that is at least twice the width of the wall and a few inches deep. Fill the trench with gravel and compact it with a tamper.

Add Rebar

Place rebar in the trench by laying it in a grid pattern. Tie the rebar together at the intersections with wire.

Step 3: Mix and Apply Mortar

Mix the mortar according to the instructions on the packaging. Using a trowel, apply a thick layer of mortar to the foundation.

Place the First Row of Blocks

Place the first row of blocks on top of the mortar, making sure they are level. Use a rubber mallet to tap them into place.

Step 4: Continue Building

Continue laying the blocks, making sure they are level and using mortar to hold them in place.

Use a Level

Regularly check that the blocks are level by using a level. Adjust as necessary.

Step 5: Cut and Shape Blocks

To fit blocks around curves or corners, you may need to cut or shape them. Use a chisel and hammer to carefully cut or shape blocks as needed.

Wear Protective Gear

Always wear protective gear, such as safety glasses and gloves, when cutting or shaping blocks.

Step 6: Fill in Gaps

Once the wall is built, fill in any gaps between the blocks with mortar.

Smooth the Mortar

Use a trowel to smooth the mortar and create a clean finish.


What is the best type of concrete block to use?

The best type of concrete block to use is a hollow core concrete block, as it is both lightweight and strong.

How long does it take to build a block wall?

The time it takes to build a block wall depends on the size and complexity of the project. On average, it can take anywhere from a few days to a few weeks.

Do I need a permit to build a block wall?

In most cases, you will need a permit to build a block wall. Check with your local building department to determine the specific requirements in your area.


Building a block wall can be a challenging but rewarding project. By following these steps and taking the necessary precautions, you can create a stable and durable wall that will last for years to come. Remember to plan and prepare, use the right materials and tools, and follow safety guidelines throughout the process.