Outdoor Fireplaces

What Is an Outdoor Fireplace

An outdoor fireplace creates a fixed focal point within a patio or seating area. Unlike a fire pit, it introduces vertical mass and architectural presence. It anchors the layout and often defines the main gathering zone.

They can be wood-burning or gas. Large enough to anchor a pavilion, or reservied and placed on a corner. But once they’re placed, they influence orientation, spacing, and how people gather.

Design Considerations

Placement is everything. A fireplace pulls seating toward it, so it needs to sit where gathering feels natural. Too far off center and it becomes decorative. Too dominant and it blocks circulation.

We look at prevailing wind, clearance requirements, and how it lines up with overhead structures or nearby walls. Scale matters — especially next to a pavilion or the back elevation of the house.

We often soften the stone mass with taller vertical evergreens—such as columnar or taylor junipers—behind the fireplace to add depth and balance.

How It’s Built

Outdoor fireplaces begin with the footing. Whether the structure is built from CMU core with veneer or full-formed masonry units, the foundation extends below the frost line — typically 30–34 inches in the St. Louis metro area. Masonry carries significant vertical load, and freeze-thaw movement will telegraph through the entire structure if the base isn’t correct. If the footing shifts, the fireplace shifts.

The firebox is either a prefab insert or a fully masonry-built system, depending on fuel type and styling - like linear fireplaces. Prefab units provide controlled clearances and predictable performance. Masonry builds allow more flexibility in proportion and finish but require careful adherence to firebox dimensions and chimney draft principles.

When gas is incorporated, the line is run underground and brought up behind the fireplace. A shutoff valve is installed, and the line elbows directly into the back of the firebox. This keeps the connection protected and accessible while maintaining safety and code compliance. Clearances to combustibles, chimney height, and termination details are coordinated before construction begins — not solved mid-build.

Chimney height is determined by draft requirements and surrounding conditions. Too short and it won’t draw properly. Oversized and it can dominate the patio visually. Masonry courses are aligned carefully, reinforced where required, and capped to shed water and protect the flue.

Most fireplace failures trace back to foundation movement or moisture management — not the visible stone or brick. When footing depth, structure, and venting are handled correctly, the fireplace becomes a permanent architectural anchor rather than a decorative feature set on top of a slab.

Pricing Factors

Most professionally built outdoor fireplaces begin around $25,000.

An outdoor fireplace with wood boxes typically ranges from $35,000–$45,000. Larger architectural fireplaces or adding elements like arbors or connecting to pavilions can reach $60,000+.

Primary cost drivers include height and mass, materials, wood box integration, fuel type, and site conditions.

Outdoor Fireplaces

At A Glance:

Design Considerations
Consider wind direction, sightlines from seating areas, and whether it serves as a backdrop or the focal point of the patio.

Common Pairings
Patios, seating walls, pavilions, and pergolas.

Pricing Factors
Typically $18k–$60k+. Custom masonry and chimney requirements elevate scope.

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Frequently Asked questions about

Outdoor Fireplaces

Do fireplaces require a gas line or can they be wood-burning?

How do I get started?

Is there a fee for the design consultation?

related Projects

Landscape & Pool Design

Outdoor Kitchens

Outdoor Fireplaces

Seating Walls

Flagstone Walkways

Patios

Water Features

Landscape Beds

Landscape Lighting

Retaining Walls

Pools

Fencing

Putting Greens

Decks

Pergolas

Pavilions

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