How to Build a Fire Pit in Backyard | Done Right the First Time

A backyard fire pit needs a flat, non-combustible base and at least 10 to 15 feet of clearance from structures, fences, and trees.

Building a fire pit in your backyard comes down to three things: the spot you pick, the materials you use, and the fuel you burn. Most local rules follow the same logic — keep the fire away from anything that can catch, put it on a surface that won’t burn, and never leave it alone. Whether you’re planning a DIY build or buying a portable unit, the checklist below keeps you legal and safe.

Where to Put a Fire Pit: Clearance Rules That Apply

Location decides nearly everything else. Some codes go further — another example requires outdoor fireplaces and fire pits to sit at least 15 feet from a structure.

Check your own city or county code before you dig, because legal clearances vary widely. Depending on your jurisdiction and pit type, the required distance can be 10 feet, 15 feet, or as much as 25 feet. Your HOA may add its own rules on top.

Skip the deck. Fire authority guidance says to avoid placing a pit on decking or near trees, sheds, or fences, and to keep it steady so it can’t tip. The same municipal rules say outdoor fireplaces should never sit on combustible balconies or decks or under combustible overhangs.

Base and Size: What the Code Says

The pit needs a flat, level, non-combustible base, clear of roofs, tree branches, and utility wires overhead.

Build your base from brick, stone, paver blocks, or gravel — anything that won’t burn. If you’re using a store-bought metal ring, set it on that same stable surface so it can’t settle or tip.

Fuel, Sparks, and a Fire That Stays Put

Burn only what the rules allow, and that list is short. Municipal codes consistently permit clean, dry firewood and untreated wood only. The prohibited list is long: painted, treated, wet, or green wood; yard waste; garbage; rubber; plastic; furniture; cardboard; railroad ties; and household rubbish all fail the test. Kiln-dried wood is the best pick because it reduces sparks and smoke.

Light it the slow way. Never use chemicals such as petrol to start a fire — use kindling and add larger wood gradually. Keep a bucket of water, sand, or a garden hose within reach before you strike the match.

Watch the weather. Never leave a fire unattended, and make sure it’s fully extinguished before bed.

Gas Fire Pits: One Extra Rule

Gas-fired units follow a different playbook. One code example requires compliance with the manufacturer’s operating instructions plus a remote shutoff control valve for gas-supplied units. Commercial-occupancy rules go further, requiring a timed shutoff and an emergency stop button on the exterior wall. For a home unit, the remote shutoff is the part to confirm before you buy or build.

Before you purchase or pour concrete, pull your local fire code, zoning code, and HOA rules. They genuinely differ — and the difference between a fine and a safe season is usually one phone call. If you’re comparing ready-made models, our roundup of the best back porch fire pits covers tested units that meet clearance-friendly sizes.