Gas Outdoor Fireplace Guide: Types, Costs, Permits, and Design

Key takeaways:

• Gas fireplaces light instantly, adjust easily, and produce no smoke or ash.
• HomeGuide: prefab outdoor fireplaces cost $1,500 to $9,000 installed and custom fireplaces $6,000 to $20,000 nationally.
• Modern Yardz's full outdoor fireplaces with chimneys and mantels in San Diego range from $15,000 to $40,000 or more.
• City of San Diego: masonry and wood-burning prefab fireplaces need a building permit; some gas-burning decorative fireplaces do not, but may need a plumbing or electrical permit.
• Near the coast, salt air corrodes metal components, so specify marine-grade materials.

A gas outdoor fireplace is the centerpiece of many San Diego outdoor rooms. It anchors seating, blocks wind, and makes cool coastal evenings comfortable without the smoke and cleanup of wood. At Modern Yardz, we design and build outdoor fireplaces and fire features across San Diego County.

This guide covers the types of gas fireplaces, fuel choices, cost, permits, and design considerations.

Why choose a gas outdoor fireplace?

Convenience, control, and cleanliness.

• Instant ignition with a key valve, push button, remote, or smart control.
• Adjustable flame for ambiance or heat.
• No smoke or ash, which matters on smaller lots and near neighbors.
• Design freedom: gas burners suit linear fireboxes, see-through designs, and fire-and-water features that are not possible with wood.

Wood still has a place in a traditional masonry fireplace where the crackle and smell are the point, and it remains legal in San Diego subject to nuisance rules and Red Flag Warnings. For most homeowners, gas is the everyday choice.

What types of gas outdoor fireplaces are there?

• Prefab fireplace units: Factory-built fireboxes that are installed and finished with stone, stucco, or tile.
• Custom masonry fireplaces: Built on site with a footing, firebox, chimney, and veneer for a fully custom design.
• Linear and modern fireplaces: Wide, low fireboxes with glass media, often integrated into a wall or outdoor kitchen.
• See-through fireplaces: Open on two sides to divide and serve two seating areas.
• Fireplace walls: A fireplace combined with a TV niche, wood storage, and built-in benches.

If you want fire in the middle of a seating group instead, see our fire pit ideas. A fireplace throws heat one way and acts as vertical architecture; a fire pit is 360 degrees and keeps sightlines open.

Natural gas or propane?

Natural gas where a line can reach the fireplace; propane where it cannot. Natural gas never runs out, while propane requires a tank and refills. Burners are listed for one fuel with fuel-specific orifices, so a natural gas burner cannot simply run on propane. HomeGuide's outdoor fireplace cost guide puts gas line runs at $15 to $50 or more per linear foot, or $350 to $2,000 on average, and an installed propane tank at $600 to $2,500.

How much does a gas outdoor fireplace cost?

Nationally, HomeGuide puts prefab outdoor fireplaces at $1,500 to $9,000 installed and custom fireplaces at $6,000 to $20,000.

In San Diego, Modern Yardz's full outdoor fireplaces with chimneys and mantels range from $15,000 to $40,000 or more, depending on height, veneer, and whether the design carries a full masonry chimney. Linear fireboxes and fire-and-water features are priced from the design, since the gas run and burner length drive them more than the footprint. These are our own completed-project ranges.

Cost drivers include:

• Size and height of the fireplace and chimney
• Veneer: stucco, stone, tile, or porcelain
• Gas line length and any electrical for ignition or lighting
• Foundation and footing requirements
• Built-ins such as benches, wood storage, or TV niches

Do you need a permit for a gas outdoor fireplace in San Diego?

It depends on the construction and fuel. The City of San Diego's Information Bulletin 201 states that a building or combination permit is required to construct any masonry fireplace or wood-burning prefabricated fireplace, while some gas-burning decorative fireplaces and fire pits do not require a building or combination permit but may require a plumbing or electrical permit. It also notes that fireplace enclosures can encroach into required yards only within set limits.

As a licensed landscape contractor, Modern Yardz handles the gas line and electrical work as part of the overall landscape project, so the fireplace, hardscape, gas, and ignition sit under one contract.

What clearances and chimney rules apply?

Built-in fireplaces follow the building and residential codes for footings, clearances to combustibles, and chimney height. California's residential code requires a chimney to terminate at least two feet higher than any part of a building within ten feet, and at least three feet above where it passes through a roof, which is why a fireplace close to the house often needs a taller chimney. Gas units also follow their listing and the manufacturer's installation instructions. Resolve these during design, not at inspection.

How do you design around salt air?

Specify materials that resist corrosion. Fireplace manufacturers commonly exclude salt-air and humidity corrosion from their warranties. Near the coast, use 316 stainless where spray reaches, detail the cap and veneer to shed water, and rinse metal parts with fresh water. Our La Jolla backyard ideas cover coastal material choices in more detail.

Gas fireplace design ideas

• Anchor the outdoor room: Place the fireplace at the end of a covered patio so seating faces both fire and view; see our covered patio ideas.
• Pair with an outdoor kitchen: A fireplace beside the cooking zone turns dinner into an evening. See our outdoor kitchen ideas.
• Block the wind: On coastal lots, a fireplace wall can shelter seating from the afternoon breeze.
• Light it well: Uplight the chimney and add step and path lights so the space works after dark.

Design your gas outdoor fireplace

A great fireplace is designed with the seating, shade, and view around it. Modern Yardz designs and builds custom gas fireplaces as part of complete outdoor rooms, shown in a 3D rendering with a line-item cost. Call 619-775-9554 or book a free design consultation.