How much does it cost to convert a single-sided fireplace to a see-through in Calgary?

Converting a single-sided fireplace to a see-through (double-sided) is one of the most complex and expensive fireplace projects a Calgary homeowner can undertake — expect to budget $8,000–$20,000+ depending on the fireplace type, wall construction, and finishing.

This isn't a simple swap. A see-through fireplace shares a firebox between two rooms, which means structural modifications to the wall, a completely new fireplace unit designed specifically for see-through use, new venting, and finishing work on both sides. The scope is closer to a small renovation than a fireplace upgrade.

What Drives the Cost

The fireplace unit itself is the starting point. A see-through gas fireplace (direct-vent, which is the right choice for Calgary) runs $3,500–$7,000 for the unit alone — significantly more than a comparable single-sided unit because the firebox, burner, and glass panels are engineered for dual-sided viewing. Brands like Napoleon, Regency, and Valor all make quality see-through models well-suited to Calgary's heavy heating season.

Structural work is where costs escalate quickly. Your existing fireplace was built for single-sided use. Converting it means opening the wall on the second side, modifying or replacing the firebox surround, and potentially dealing with structural framing if load-bearing elements are involved. If your current fireplace is a masonry unit, the masonry work alone — cutting through brick or stone, rebuilding the firebox opening — can add $2,000–$5,000 to the project. A factory-built (zero-clearance) fireplace is somewhat simpler to work with, but the existing unit almost certainly needs to be removed entirely and replaced with a purpose-built see-through model.

Venting for a see-through direct-vent gas fireplace requires careful planning. The coaxial vent pipe must terminate outside with proper clearances from windows, doors, and grade — and on a see-through unit, the vent location is constrained by the fireplace's position between two rooms. A licensed gas fitter must handle all gas line connections, and a gas permit from the City of Calgary (or your municipality) is mandatory. Budget $200–$600 for permits and inspection fees.

Finishing both sides doubles your surround costs. You're now facing two mantels, two surrounds, and two sets of finishing materials. Natural stone or tile on both sides — the most popular choice in Calgary — adds $3,000–$8,000 depending on material selection and complexity. A floor-to-ceiling stacked stone treatment on both sides of a linear see-through unit is a stunning look but sits at the top of that range.

Calgary-Specific Considerations

Calgary's extreme cold means sizing matters. A see-through fireplace loses some thermal efficiency compared to a single-sided unit because heat radiates in two directions. For rooms that face Calgary's -25°C to -35°C winters, choose a unit with at least 30,000–40,000 BTU output to ensure meaningful supplemental heat on both sides. Also confirm the unit has battery backup ignition — during winter power outages, you want that fireplace working.

Chinook pressure swings can affect draft on any gas fireplace, so ensure your installer properly seals the direct-vent system and uses a quality termination cap rated for high-wind conditions.

Realistic Total Budget

| Scope | Estimated Cost |
|---|---|
| See-through gas unit (direct-vent) | $3,500–$7,000 |
| Structural / masonry modification | $1,500–$5,000 |
| Gas line and venting | $800–$2,000 |
| Surrounds and finishing (both sides) | $3,000–$8,000 |
| Permits and inspection | $200–$600 |
| Total | $9,000–$22,600 |

This is a project that requires a fireplace contractor experienced with structural modifications, a licensed gas fitter, and potentially a mason — all coordinated together. Get at least two or three detailed quotes before committing.

Need help finding a fireplace contractor in Calgary for a see-through conversion? Calgary Fireplaces can match you with local installers for free — or browse the Calgary Construction Network directory at calgaryconstructionnetwork.com/directory?trade=fireplaces.