Once you’ve settled on a fire table, the next question is almost always: where exactly does it go? Gas fire tables have minimum clearance requirements from structures, combustibles, and overhead obstructions — and in many municipalities, a permit is required before you light it for the first time. Neither of these is complicated, but getting them wrong can mean having to move an 80-pound concrete table after the fact, or failing an inspection on a new patio build.

This guide covers the standard clearances for propane and natural gas fire tables, how to read your local codes, and what to expect from the permit process in most Wisconsin municipalities.

Why Clearances Exist — and Why They Vary

Fire table clearance requirements exist because gas flames radiate heat outward beyond the visible flame, and that radiant heat can ignite adjacent combustibles if the table is placed too close to a fence, deck railing, overhead structure, or house wall.

The variance in published clearance numbers comes from the interaction between three different sources of rules: the appliance manufacturer’s installation manual, the local fire code (usually NFPA 58 for propane or NFPA 54 for natural gas, adopted locally with amendments), and sometimes a homeowner’s association or municipality that has added its own rules on top of those. Always check all three for your specific situation.

Standard Clearances for Outdoor Gas Fire Tables

The following are typical minimum clearances published in manufacturer installation manuals and standard fire codes. Always verify against your specific appliance’s manual and your local code — these are starting points, not universally binding rules.

Clearance type	Typical minimum	Notes
From combustible structures (house wall, fence, shed)	36 inches	Most common requirement; some manufacturers specify 18–24 in. for non-combustibles
From overhead combustibles (pergola, awning, tree branch)	36–80 inches	Varies significantly by manufacturer; taller flames (high BTU) need more clearance
From deck railings (wood or composite)	24–36 inches	Combustible railings are treated the same as combustible walls
From non-combustible structures (brick wall, concrete)	18–24 inches	Non-combustibles have reduced but still real minimums
Above a combustible deck surface	Per installation manual	Some tables require a heat shield or ceramic tile on combustible deck boards under the unit

A Note on BTU Output and Overhead Clearance

Overhead clearance is the most variable and the most important to get right. A table running 40,000 BTU with a taller flame column needs significantly more clearance above it than a 60,000 BTU table that produces a wide, low flame pattern. The only reliable source for overhead clearance is your specific table’s installation manual — not a generic number from the internet.

Propane vs. Natural Gas: Does It Change the Clearances?

In most cases, the clearances are the same for propane and natural gas fire tables of comparable BTU output. The key variable is BTU output and flame height, not fuel type. Where fuel type does matter is in propane tank placement: a propane tank must typically be stored a minimum of 3 feet from the fire feature opening and from any ignition source, including the table itself when the burner is running. Check your specific tank and appliance manuals.

Clearances on a Wood or Composite Deck

This is the most common scenario where homeowners underestimate requirements. A composite deck surface is a combustible surface. An elevated wood deck with a pergola above it has combustibles both below and above the table. In this situation:

Check the manufacturer’s manual for deck-specific guidance. Many fire table manufacturers specify that the table may not be placed directly on combustible decking without a heat shield or non-combustible pad underneath. CastinCrete’s concrete apron designs direct heat up and away from the deck surface, but the underlying deck boards can still accumulate heat if the table is operated for extended periods.

Overhead combustibles on a deck are common. A pergola overhead may look like it’s “far enough away,” but if it’s made from wood or composite material, it needs to meet the minimum overhead clearance in your installation manual. The combination of a fire table below and a pergola above is specifically called out in most installation manuals and local fire codes.

Do You Need a Permit for a Fire Table in Wisconsin?

In most Wisconsin municipalities, a standalone fire table does not require a permit if it is a portable, non-permanently-installed gas appliance. However, a natural gas fire table that connects to the home’s gas line almost always requires a gas line permit and inspection, because you’re modifying a permanently installed gas system.

Rules vary significantly by municipality. Some general guidance:

Propane fire tables (using a portable cylinder or tank): Typically no permit required for the table itself. Confirm with your local building or fire department, especially if you’re building a new patio or deck around it.

Natural gas fire tables (connected to home gas line): A gas line permit is almost always required for the line run. The appliance itself may or may not require a separate permit, but the gas piping work requires a licensed plumber or gas fitter and a permit in virtually every Wisconsin municipality.

Built-in fire tables in a new patio or outdoor kitchen: If you’re installing the fire table as part of a larger permitted patio or outdoor kitchen project, the fire feature will typically be included in that permit and inspection. Confirm with your contractor.

How to Check Your Local Rules

The fastest approach is to call or email your municipality’s building department directly — not the fire department (which handles operational fire safety), but the building department (which handles permits and construction). Tell them you’re installing a gas fire table and ask whether a permit is required and whether there are any local amendments to the state fire code that affect clearances.

In Wisconsin, most municipalities have adopted the Wisconsin Uniform Dwelling Code and reference NFPA 58 and NFPA 54 for gas appliances. Your municipality may have additional rules, particularly if you’re in a city with its own fire prevention ordinances.

The Wisconsin Department of Safety and Professional Services (DSPS) also publishes the state building and gas codes. If your municipality hasn’t adopted specific amendments, the state baseline applies.

Frequently Asked Questions

How far does a fire table need to be from the house?

The most common requirement is 36 inches from combustible structures like house walls, wood fences, and sheds. Non-combustible structures (brick, concrete) typically have a reduced minimum, usually 18–24 inches. Always verify against your specific table’s installation manual, as manufacturer requirements may differ.

How far does a fire table need to be from a fence?

A wood or vinyl fence is a combustible structure, so the same 36-inch minimum that applies to house walls typically applies to fences as well. A metal fence or a concrete block wall may qualify as non-combustible with a reduced clearance — check your installation manual and local code.

Can I put a fire table under a pergola?

Only if the overhead clearance meets the minimum specified in your fire table’s installation manual. For most tables, that’s 36 to 80 inches of clearance above the flame opening. A low, solid-roof pergola may not provide enough clearance; an open lattice pergola may qualify if the overhead clearance is sufficient. Check your specific table’s manual.

Do I need a permit for a propane fire table in Wisconsin?

For a portable propane fire table with a cylinder tank, most Wisconsin municipalities do not require a permit for the appliance itself. If you’re having a new patio built around it, the patio construction may require a permit. If you’re running a natural gas line, a gas permit is almost always required. Always confirm with your local building department.

Does a natural gas fire table require a permit?

Yes, in virtually every Wisconsin municipality, running a natural gas line requires a gas line permit and inspection by a licensed plumber or gas fitter. The fire table appliance itself may or may not require a separate permit, but the gas piping work does.

More From the CastinCrete Learning Center

This article is part of the CastinCrete craftsmanship and buyer’s guide series. If you’re still in the decision stage, Will a Concrete Fire Table Crack or Explode? addresses the most common safety concern buyers bring up, and the full series starting with GFRC Mix Design Explained covers exactly how CastinCrete fire tables are built to last.

When you’re ready to talk specifics, contact us directly or browse our fire table collection to see current models and configurations.