How much should I budget to convert my old wood-burning fireplace to gas in Ottawa?

Converting an old wood-burning fireplace to gas in Ottawa typically costs $3,000 to $7,000, with most straightforward conversions landing in the $4,500 to $6,000 range. The final price depends on whether you're installing a simple gas log set, a more realistic gas insert, or a complete rebuild of the firebox to accommodate a modern gas unit.

Why the Cost Range Varies in Ottawa

The biggest cost driver is the condition of your existing chimney and firebox. If your chimney is sound, has a proper liner, good draft, and is already at the correct height for gas venting, you're looking at the lower end — roughly $3,000 to $4,500 for a basic gas log set or $4,000 to $5,500 for a gas insert. However, many older Ottawa fireplaces have issues that surface during inspection: deteriorated mortar joints from decades of freeze-thaw cycling, a cracked or missing chimney crown, damaged clay tile liner, improper clearances, or flashing leaks where the chimney meets the roofline. Any of these problems must be fixed before a gas appliance can be safely installed, and repairs add $1,000 to $3,000 or more to the total project cost.

A WETT Level 2 inspection ($350 to $600) before you commit to conversion is essential — it will reveal exactly what repairs your chimney needs and give you a realistic budget. Ottawa's brutal freeze-thaw cycles mean masonry chimneys deteriorate faster here than in milder climates, and skipping this inspection is a recipe for discovering a $5,000 problem midway through your project.

The type of gas appliance also matters significantly. A gas log set ($1,500 to $2,500 installed) is the most affordable option — it sits on the floor of your existing firebox and produces a convincing flame effect with modest heat output (5,000 to 25,000 BTU depending on the model). A gas fireplace insert ($2,500 to $5,500 installed) is a sealed metal box that fits inside your firebox and delivers much more heat — typically 25,000 to 40,000 BTU — making it a genuine supplemental heating appliance rather than just ambiance. A complete firebox rebuild with a new gas fireplace unit built into the opening ($4,000 to $7,000) is necessary if your firebox structure is severely damaged or if you want a completely modern look.

Critical Regulatory Considerations

All gas fireplace work in Ottawa must be performed by a TSSA-licensed gas fitter (G2 or G3 certificate) — this is Ontario law, not optional. After installation, the technician tags the appliance with a compliance label, and you'll receive documentation confirming the work was done properly. Unlicensed gas work voids your home insurance and creates serious carbon monoxide and explosion risks. Gas work is never appropriate for DIY, and any contractor who suggests otherwise should be immediately rejected.

You'll also need to ensure your existing chimney is suitable for gas venting. Older wood-burning chimneys are sometimes too large for gas appliances, which can create draft and efficiency problems. A gas fitter can downsize the flue with a stainless steel liner if needed — this typically costs $2,000 to $4,000 depending on chimney height and adds it to your overall conversion budget. Some older chimneys may need the clay tile liner replaced with modern stainless steel before any gas appliance can be safely vented through them.

Timeline and Seasonal Planning

Schedule your conversion in spring or early fall to avoid the rush of last-minute calls in October or November when everyone suddenly realizes their old fireplace is about to become their backup heat source. If you're doing any exterior chimney repairs or crown work, get this done between May and October when masonry work can cure properly — trying to repair mortar in winter rarely ends well. Plan for the project to take 2 to 4 weeks from initial inspection to final completion, depending on whether chimney repairs are needed.

What's Included in the Estimate

When you get quotes, ensure they specify: the cost of the gas appliance itself, the cost of installation labour, any required chimney inspection or relining, gas line installation or extension (if needed), the TSSA compliance tag and final inspection, removal and disposal of the old firebox damper or grates, testing for proper operation and safety, and a warranty on both the appliance and the installation work. Written quotes should also clarify who is responsible for obtaining any required building permits — typically the contractor handles this, but confirm it upfront.

Converting to gas is a smart move for Ottawa homeowners who want the ambiance and supplemental heating of a fireplace without the annual chimney cleaning demands and creosote risks of wood burning. If your old fireplace is currently non-functional or you're heating with inefficient open wood fires, a gas insert or log set will give you reliable, convenient heat and a much safer, lower-maintenance appliance.

If you'd like help finding a TSSA-licensed gas fitter and WETT-certified chimney professional to assess your fireplace and provide a formal conversion estimate, you can browse experienced fireplace contractors through the Ottawa Construction Network directory.

---

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

• 613Bins
• JC Carpentry
• Steven Labelle - Your Complete Home Renovator
• M.O.T. CONSTRUCTION INC.
• Beauty of gardens