How much does it cost to replace an old wood fireplace insert with a gas insert in Ottawa?

Replacing an old wood insert with a gas insert in Ottawa typically costs $2,500 to $5,500 installed, though that range can extend to $6,000 or more depending on your specific fireplace opening, existing venting, and whether your home already has a gas line nearby.

Here's what drives those costs: The gas insert itself runs $1,200 to $3,500 depending on size and features (standard units are more affordable; larger or decorative models cost more). Labour for removal of the old insert, preparation of the firebox, and installation of the new unit typically adds $800 to $1,500. If your existing masonry chimney can safely vent the gas insert through its original flue, you may only need a new chimney liner ($400 to $800 for a basic aluminum liner suited to gas) and a new cap. However, if the chimney needs rebuilding or structural repair — common in older Ottawa homes where masonry has deteriorated through decades of freeze-thaw cycling — costs can climb significantly. If you don't already have a gas line running to the fireplace location, adding one is an additional $500 to $1,500 depending on distance from your home's main gas meter.

Ottawa's extreme climate makes this conversion particularly sensible. A wood insert requires annual chimney cleaning and inspection by a WETT-certified sweep ($200 to $350 per year, sometimes twice yearly if you burn heavily), generates creosote buildup that poses chimney fire risk, and demands seasoned firewood storage and regular maintenance. A gas insert is cleaner, safer, and more convenient — no ash disposal, no creosote concerns, and minimal annual service ($150 to $250 for a professional inspection and tune-up). The operating cost difference is modest in Ottawa's climate; both heat similarly, though gas is slightly more economical if your insert runs frequently.

Before quoting, a TSSA-licensed gas fitter will inspect your chimney to confirm it's suitable for gas venting (or whether relining is necessary), and they'll assess your gas line situation. Don't skip this step — a chimney that worked beautifully for a wood insert may not meet code requirements for a gas appliance, and fixing that problem mid-project inflates costs. Similarly, confirm that your fireplace opening dimensions will accommodate the new insert; oversized or undersized openings occasionally require custom framing, adding $300 to $800 to the project.

Critical consideration: This project requires both a TSSA-licensed gas fitter to handle the gas line and insert installation (this is mandatory under Ontario law) and possibly an ESA-licensed electrician if the insert requires hardwired electrical for ignition or a blower fan. Confirm licensing and compliance documentation before work begins — unlicensed gas work voids your home insurance and creates serious safety risks.

The best time to schedule this conversion in Ottawa is April through June or late August through September, before the autumn rush when every homeowner suddenly wants their fireplace ready for winter. Spring scheduling also gives your installer flexibility to address any chimney issues they discover during inspection.

If you'd like to connect with TSSA-licensed gas fitters and WETT-certified professionals in Ottawa who specialize in insert conversions, you can browse fireplace contractors through the Ottawa Construction Network directory. Get at least three written quotes that specify the exact scope (insert model, liner type, any chimney repairs, gas line work), materials, and timeline — costs vary significantly based on your chimney's current condition.

---

Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• Homeupgraders
• The Egress Group Inc
• ZinoM Concrete & Landscaping
• Jaiko Cleaning Services
• East Coast Sheet Metal Inc