A portable fire pit lasts a few seasons and ends up in the side yard. A well-designed built in fire pit becomes the gravitational center of the backyard for 20 years or more, holding resale value, anchoring an outdoor room, and turning a 50°F October evening into prime entertaining time. The work involved is more substantial than a Solo Stove drop-in, but the design choices and code clearances are well within reach for confident DIYers and predictable for hired contractors.
Wood Burning vs Gas: Pick Before Anything Else
The single biggest design decision is fuel type. Wood burning pits cost less to build (typically $1,500 to $4,500 for materials), produce real flame and the campfire scent people associate with fire, and require zero ongoing fuel cost beyond firewood. They also produce smoke, ash, and require clearance from structures.
Gas pits (natural gas or propane) cost $3,500 to $9,000 installed because of the gas line and burner kit. They light in seconds, produce no smoke or ash, and run on a key valve or remote ignition. Some HOAs and many jurisdictions only permit gas in residential settings within 25 feet of the house, so always check local code before designing.
Code, Clearances, and Permits
Most US fire codes require permanent backyard pits to sit at least 10 feet from any structure or combustible surface, including wood fences, sheds, and overhanging tree branches. Some jurisdictions require 15 to 25 feet. HOA covenants are often stricter than municipal code.
Permits run $150 to $500 depending on the project scope. Gas pits almost always require a permit because of the fuel line. Wood burning pits often do not require permits but always require setback compliance. Call the local building department before pouring the first foundation and ask whether a site sketch is required.
Materials That Last 20 Years
The exterior wall is usually concrete block, stacked stone, brick, or manufactured veneer. Concrete block at $2 to $4 per block is the cheapest structural option. Natural stone at $20 to $40 per square foot of wall surface looks the best but doubles the labor time.
The interior must be lined with refractory brick or fire-rated concrete block. Standard concrete block cracks under the heat differential between 1,500°F flame and cool exterior. Refractory brick at $3 to $6 each handles direct flame for 30 plus years. A 36 inch interior diameter pit needs roughly 30 refractory bricks for a single course wall.
Sizing the Pit Correctly
Interior diameter of 30 to 44 inches handles most residential needs. Smaller than 30 inches and you cannot fit a useful fire. Larger than 44 inches and the wall radius shape becomes impractical without a custom steel ring insert. Wall thickness is usually 6 to 8 inches in masonry to handle the heat plus the cooling and structural loads.
Wall height of 14 to 18 inches lets people sit at standard 16 inch chair height with feet propped on the wall. Lower walls expose the fire too much; taller walls block sightlines and trap heat in the center. Plan a 6 to 8 inch wide cap on the wall for setting drinks.
The Foundation: Get This Right or Tear It Out
A built in fire pit needs a 4 to 6 inch reinforced concrete pad extending 6 inches beyond the pit on all sides. Reinforce with #4 rebar on a 12 inch grid. Underneath, place 4 inches of compacted gravel base. Skip this step and frost heave will crack the pit within three winters in any climate north of Atlanta.
Allow drainage. The pit interior should slope slightly to a 2 inch weep hole at the bottom of the wall. Water that pools in the bottom freezes, expands, and pops refractory brick out of place. A simple drain rock layer beneath the burner or fire grate pulls water away from the bricks.
Gas Pit Specifics
Gas burners come in 18 to 36 inch round or H-shaped configurations from brands like Warming Trends, HPC, or Fire by Design. Stainless steel burners last 15 to 20 years; brass burners 25 to 30 years but cost twice as much. Most residential burners run 65,000 to 250,000 BTU.
The burner sits on a steel pan with a media bed of fire glass, lava rock, or ceramic logs. Fire glass at $3 to $6 per pound looks the most modern. Lava rock at $1 to $2 per pound reads more natural. A 36 inch pit needs roughly 40 pounds of glass or lava media. Always pull a permit and have the gas line pressure-tested before using the pit.
Seating, Patio Integration, and Lighting
Plan the surrounding patio at least 6 feet wider than the pit on all sides to accommodate chairs and traffic flow. A 36 inch pit calls for roughly 12 to 14 feet of total patio diameter at minimum. Built in seating walls 18 inches tall and 16 inches deep (with a cushion) seat 4 to 6 people comfortably around a typical pit.
Low-voltage path lighting around the pit makes evenings safer without competing with the fire. A $200 LED transformer kit from Volt or Kichler powers 6 to 8 small fixtures along seat walls and pathways. Skip overhead lighting that washes out the firelight and changes the mood entirely.
Frequently Asked Questions
How much does a permanent backyard fire pit cost?
A masonry wood burning fire pit runs $1,500 to $4,500 in materials and $3,500 to $9,000 installed. A gas pit costs $3,500 to $9,000 installed including the gas line. Premium custom designs with high-end stone veneer can reach $15,000 or more.
Can I build a fire pit on my own patio?
Yes if you have proper clearances (10 feet minimum from structures), a non-combustible patio surface, and your local code permits it. Pavers, concrete, and natural stone all work. Wood and composite decks generally do not, even with heat shields.
How deep should a masonry fire pit be?
Interior depth from cap to floor is typically 12 to 18 inches. Wood burning pits go deeper at 14 to 20 inches to contain logs. Gas pits with a burner pan are usually 8 to 14 inches deep, just enough to seat the pan and media at the right height.
Do I need a permit for a permanent fire pit?
Gas pits almost always require permits because of the gas line. Wood burning pits often do not require permits but must meet setback requirements. Check with your local building department and HOA before starting.
