How deep should the pit be?
Documented on the Digging a small underground firepit for safer build
Published March 28, 2026
A common depth is 12–24 inches depending on desired containment and frost depth in your area.
Full Answer
A common depth is 12–24 inches depending on desired containment and frost depth in your area. Too shallow reduces containment and too deep can create drainage or airflow issues—12–18 inches is typical for a small backyard pit.
Documented In This Build
Related Knowledge
Can I use regular bricks or pavers for the lining?How do I safely extinguish the fire?What torque should I use on the blade bolt?What maintenance is required to keep the runtime optimal?What were the most critical problems found on the test drive?Can these issues be fixed cheaply or will it cost a lot?How do I know if the leak is from the oil pump or the tank?Can I fix the leak without buying a new pump?
Related Parts
Steel fire pit ring
$50
Fire bricks (set, approx. 6–10)
$60
Crushed gravel (½ yard or bagged equivalent)
$25
Play sand / coarse sand (1–2 bags)
$5
Landscape fabric
$10
Grate / cooking grate (optional)
$25
Related Tools
Tape measure
Level
Shovel (square and/or round)
Pick mattock / pickaxe
Posthole digger / clamshell digger
Wheelbarrow
Hand tamper / plate tamper
Rake
Work gloves (heat-resistant recommended)
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