How to Build a Square Fire Pit with Concrete Blocks: A Simple DIY Guide
- webseomember33
- Apr 14
- 3 min read
There's something magical about gathering around a fire pit—whether you're roasting marshmallows, enjoying late-night chats, or just soaking up the warmth. If you've ever wanted to add that cozy vibe to your backyard, you're in luck. Building a square fire pit with concrete blocks is a beginner-friendly DIY project that can be done in a single weekend. And bonus: it won’t break the bank.
In this guide, we’ll walk you through the process step by step—from picking your spot to laying the last block.
Tools & Materials You'll Need
Before we get started, gather the following tools and materials:
Tools:
Shovel or spade
Level
Tape measure
Rubber mallet
Safety gloves and glasses
Garden rake
Wheelbarrow (optional but helpful)
Materials:
Step 1: Choose the Right Spot
First things first—find a safe, level spot in your yard away from flammable structures like your house, shed, or overhanging trees. Most local codes require fire pits to be at least 10 feet from any building, so check with your city or HOA before you start digging.
Once you’ve chosen your spot, use spray paint, string, or stakes to outline a square that’s around 36–44 inches wide, depending on how large you want your fire pit.
Step 2: Prepare the Ground
Use a shovel to dig out the marked area to a depth of about 6 inches. This ensures your fire pit has a solid base and sits evenly. Remove any roots, rocks, or debris, then use a rake to level the area.
If you want to be extra secure, lay down a layer of landscaping fabric to prevent weeds from growing through.
Step 3: Add the Base Layer
Pour 3 to 4 inches of gravel or paver base into the pit area. Use a tamper or the flat side of your shovel to compact it firmly. This helps with drainage and creates a stable base.
Optional: Add a thin layer of sand on top to make leveling the first row of blocks easier.
Step 4: Lay the First Row of Blocks
Place the first row of concrete blocks directly on the base. Take your time to make sure each block is level with the others. Use a rubber mallet to tap them into place as needed. A level surface here is critical—if the first row is off, the whole structure will be too.
Step 5: Build Up the Walls
Stack the next layers of blocks, staggering the joints like you would with bricks. This not only looks better but also adds strength. Most square fire pits are two or three layers high. For added stability, you can use construction adhesive between layers.
Optional: To protect the blocks and prolong the life of your fire pit, consider adding a fire pit insert or lining the interior with fire bricks.
Step 6: Fill the Center
Once your blocks are set, fill the center of the fire pit with a few inches of gravel. This helps with drainage and prevents fire damage to the ground underneath. Avoid using river rocks or regular bricks inside the pit as they can explode when exposed to heat.
Step 7: Enjoy Your Fire Pit!
You're done! Now it’s time to grab some firewood, spark up a flame, and enjoy your new backyard hangout. Always keep a fire extinguisher, water source, or sand nearby for safety, and never leave the fire unattended.
Fire Pit Safety Tips
Only burn dry, seasoned wood.
Keep children and pets at a safe distance.
Never use gasoline or lighter fluid to start a fire.
Always check for local burn restrictions before lighting a fire.
Final Thoughts
A square fire pit made from concrete blocks is one of the easiest and most affordable ways to upgrade your outdoor space. It’s low-maintenance, stylish, and perfect for everything from summer BBQs to chilly fall nights.
And the best part? You built it yourself.
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