How to Build a Gas Fire Pit: A Step-by-Step Guide

Gas fire pits are an excellent addition to outdoor spaces, providing warmth, ambiance, and a focal point for gatherings. They’re cleaner and more convenient than wood-burning options, with no ash to clean up or wood to stack. 

Building one yourself is a rewarding project that allows you to customize the design to suit your style and space. With the right planning, tools, and materials, you can create a gas fire pit that enhances your yard or patio while providing years of enjoyment. 

This guide will show you step-by-step how to build a gas fire pit in your backyard!

How to Plan Your Gas Fire Pit

Before you begin construction, careful planning is crucial to ensure your fire pit is safe and functional. This stage involves selecting the right location, understanding safety requirements, and gathering the necessary materials and tools.

Choosing the Location

1. The first step in planning is deciding where to place your gas fire pit. Selecting a flat, stable area that meets safety clearances is important. 
2. Ensure at least 24 inches of space from combustible materials on the sides, 4 inches below the burner, and 72 inches above the burner. 
3. Your location should also provide enough room for seating and movement around the fire pit, creating a comfortable and inviting atmosphere. 

Whether you install it in your backyard, patio, or deck, ensure it meets local building codes and fire safety regulations.

Selecting the Gas Type

Your gas fire pit can run on either natural gas or propane. Natural gas is ideal to connect the fire pit to your home’s gas supply, providing a steady, unlimited fuel source. 

On the other hand, propane offers more flexibility in placement and can work with small portable tanks or larger fixed ones. 

When choosing your burner kit, confirm that it is compatible with your chosen gas type and meets local safety standards.

Permits and Local Codes

Before beginning construction, check your local regulations to ensure compliance with building codes and fire safety laws. Some areas may require permits, particularly for connecting to natural gas lines. Addressing these details upfront will save you potential complications down the road.

Gathering Tools and Materials

You’ll need several essential tools and materials to build your gas fire pit. Build the fire pit's base with landscape blocks or other materials. 

• Choose a burner kit slightly larger than the inside dimensions of your pit; for example, a 42-inch burner plate works well for a fire pit measuring 40 inches across. 
• This ensures the block base fully supports the burner and fire media.

Additional materials include: 

• gas lines, 
• fittings appropriate for your chosen gas type, 
• and fire pit media such as lava rocks, fire glass, or ceramic logs. 

If installing the fire pit on the ground, use Class V material to create a level surface and allow for proper drainage. On patios or decks, consider installing a drain to prevent water buildup. You’ll also need tools like: 

• a level, 
• shovel, 
• tape measure, 
• and possibly a saw to cut blocks to fit. 

Outdoor construction adhesive is optional but recommended for securing the blocks for a more permanent structure.

Build the Base of Your Gas Fire Pit

The base of your gas fire pit provides the foundation for the entire structure, so it’s essential to ensure it’s sturdy and level: 

1. Begin by selecting your fire pit frame. 
2. You can use pre-made metal frames or construct one using pavers, concrete blocks, or bricks. 
3. Pavers are a popular option as they’re versatile, durable, and easy to work with.

If you’re constructing the frame, start by laying the first layer of blocks or pavers in a circular or square pattern, depending on your design. 

1. Use a bubble level to ensure each piece is level, as an uneven base can compromise the stability of your fire pit. 
2. If you plan to place the fire pit on grass or dirt, prepare the ground by leveling it and laying down Class V material or gravel to ensure proper drainage. 
3. On patios or decks, confirm the surface is flat and stable or adjust as needed.

Once the first layer is in place and secure, add additional layers, offsetting each block slightly to create a more stable structure. Use outdoor construction adhesive between the layers to make the structure more permanent.

 

Install the Gas Burner

The gas burner is the heart of your fire pit, responsible for creating the beautiful flames. Proper installation is key to ensuring safe and efficient operation. 

When planning to install a gas fire pit, two crucial factors need consideration: 

• the required gas line size 
• and the BTU (British Thermal Unit) requirements for your fire pit burners. 

Here's what you need to know:

The relationship between burner size and BTUs is straightforward: larger burners require more BTUs to operate effectively. However, there's an important consideration regarding gas line length: as the gas line gets longer, you'll experience a decrease in BTU delivery to your fire pit.

To properly size your gas line, you'll need to consult BTU capacity charts that show which pipe sizes are appropriate for your burner's needs. Remember that each plumbing fitting or elbow in your gas line will reduce BTU capacity. 

A practical rule of thumb is subtracting 5 feet of equivalent pipe length from each fitting in your setup to account for this reduction.

Connect the Burner With the Gas Line

1. Start by connecting the burner to the gas line. 
2. If you’re using propane, a smaller fire pit can connect to a 20-pound propane tank, but larger setups require a larger tank or connection to a natural gas line.
3. Lay the burner plate on the fire pit base, ensuring it’s centered. 
4. Most burner kits include a notch to accommodate the electrode system, which should align with the control panel for easy access. 
5. Follow the instructions in your burner kit manual to connect the gas line securely, using the proper fittings and sealants to avoid leaks.

Before proceeding, test the gas line for leaks: 

1. Apply soapy water to all connections and slowly turn the gas on. 
2. Look for bubbles forming, which indicate a leak that needs to be fixed before use. 
3. Once you’ve verified no leaks, you can attach the burner to its final position.

Add Fire Pit Media

Fire pit media enhances the appearance and functionality of your gas fire pit. Popular options include lava rocks, fire glass, and ceramic logs. 

• Lava rocks are a cost-effective and natural choice, providing excellent heat distribution. 
• Fire glass offers a modern, polished look in various colors.
• Ceramic logs replicate the traditional appearance of a wood-burning fire pit.

How to Select Fire Pit Media

When selecting fire pit media, consider the overall aesthetic of your outdoor space and the type of flames you want to create. 

For example, fire glass is perfect for a sleek, contemporary design, while lava rocks are ideal for rustic or natural-themed setups. Ensure the media you choose is compatible with your burner type and can withstand high temperatures.

Spread the media evenly over the burner, covering the entire surface while keeping the burner ports clear. Avoid placing any media in the wind guard area, as this can interfere with proper flame operation.

Testing and Enjoying Your Gas Fire Pit

Once your gas fire pit is fully assembled, it’s time to test it and ensure everything functions as intended. 

1. Begin by carefully lighting the fire pit for the first time. Most modern burner kits come with an ignition system, such as a push-button spark igniter or an electronic ignition. 
2. Follow the manufacturer’s instructions to ignite the flame and keep a fire extinguisher nearby for safety.

As the flames ignite, observe their height and intensity: 

1. Use the control panel to adjust the flame to your desired height. 
2. A low, steady flame is ideal for relaxing evenings, while higher flames can provide more warmth and drama. 
3. If the flame doesn’t appear as expected, double-check the gas connections and pressure and ensure the media do not obstruct the burner ports.

Adopt a regular maintenance routine to keep your fire pit in top condition: 

• Periodically check for gas leaks and inspect the burner and control panel for wear or damage. 
• Clean the fire pit media to remove soot or debris, and store it under a weatherproof cover when not in use to protect it from the elements.

Conclusion

Building a gas fire pit is a rewarding project that adds warmth and charm to your outdoor space. By following the steps outlined in this guide—planning your design, constructing a solid base, installing the burner, and adding the perfect fire pit media—you can create a stunning centerpiece for gatherings or quiet evenings under the stars.

Safety should always be a priority. Test the gas connections, maintain the fire pit regularly, and ensure proper clearance from combustible materials. Your gas fire pit will provide years of enjoyment with the right care.

For even more customization, consider exploring additional fire pit accessories, such as wind guards, decorative fire rings, or unique fire pit media. The possibilities are endless, whether you want to elevate your design or enhance functionality. Start building your dream gas fire pit today!