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Restored Toronto masonry fireplace at dusk with the CN Tower skyline
Ajax · From $890

Gas Line & B-Vent Conversion in Ajax.

Wood-to-gas fireplace conversions — gas line run, appliance set, and B-vent or direct-vent termination. Because Ajax building stock spans everything from century brick to 2020s builds, we bring the tools and materials for every era of chimney construction — no return trips, no surprises.

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WETT certified · $5M insured · 5-year warranty

Why Ajax chooses us

Gas Conversion you can actually trust

Converting an open wood fireplace to gas means more than dropping in a log set. We run and pressure-test the gas line, install the appliance, and vent it correctly — B-vent through the existing masonry flue with a listed liner, or direct-vent through the wall.

We carry $5M in liability insurance and WSIB coverage — verifiable before we set foot on your Ajax property.

Scope

What's included

Benefits

  • TSSA-licensed gas fitting and pressure testing
  • B-vent liner or direct-vent termination
  • Existing masonry flue re-used where listed
  • Full combustion and CO commissioning

Our process

  1. 1. Load calculation and gas line routing plan
  2. 2. Run and pressure-test the line to the hearth
  3. 3. Install appliance and listed vent or liner
  4. 4. Commission, CO test, and register the warranty
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We serve every Ajax neighbourhood

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The complete Ajax guide

Gas Line & B-Vent Conversion in Ajax: everything before you book

Ajax conditions that change how gas line & b-vent conversion is done

If you mapped our Ajax service calls on a calendar, you would see the same shape every year: the problems are created in February and paid for in November.

Post-war subdivisions across Durham share the same construction generation, so when one street starts showing the same defect, the neighbours usually follow within a couple of seasons.

Infill and renovation work in Ajax frequently reroutes venting without re-sizing it, and undersized or over-long runs are the single most common cause of poor draft we see.

Across Northwest Ajax, Duffin's Bay, Ajax Waterfront, Downtown Ajax and West Ajax, the housing stock changes street by street, and the correct method changes with it. A century home with a soft-brick stack does not get the same treatment as a 2010 build with a factory-built vent — using one method on both is how systems get damaged.

the practical takeaway is that a gas line & b-vent conversion visit should start with an assessment, not a tool. Any crew that begins work before telling you what they found is guessing on your behalf.

Warning signs Ajax homeowners call us about

Homeowners rarely call because something failed — they call because something changed. In Ajax the change is usually small, seasonal, and easy to talk yourself out of.

Symptoms also tend to arrive in pairs, and the pairing is the diagnostic clue. A smell plus a stain is a moisture path. Poor performance plus a noise is usually an obstruction.

  • A carbon monoxide alarm that chirps only during long burns
  • Smoke rolling back into the room when you first light a fire
  • Paint or wallpaper lifting on the wall that backs the chase
  • Standing water or rust flakes in the clean-out door
  • Mortar joints you can scratch out with a key
  • White chalky staining (efflorescence) on exterior brick
  • A smell that gets stronger on humid days
  • Lint accumulating around the exterior vent hood
  • Birds, squirrels or wasps audible inside the stack

Not sure which service you need? Compare Chimney Rebuild in Ajax, Inspection in Ajax, Flashing Repair in Ajax — or start with the full Ajax service hub.

What happens from arrival to hand-off

Every Ajax job follows the same documented sequence. The sequence exists so that two different technicians produce the same result, and so you receive the same evidence either way.

Timing varies with condition, but the sequence does not shorten because the schedule is tight.

  • The service itself, performed to CSIA / WETT method
  • Full visual assessment and photo documentation of the starting condition
  • Interior protection — drop sheets, HEPA vacuum staged before any tool is opened
  • Baseline readings taken before work starts, so the improvement is measurable
  • Exterior walk-around to check crown, cap, flashing and termination
  • Verbal walkthrough with you before the technician leaves the property
  • Debris removal and a final clean-up pass through the work path
  • Camera or scope inspection where access allows, so findings are evidence-based

How gas line & b-vent conversion in Ajax is priced

Gas Line & B-Vent Conversion in Ajax starts at $890 for a standard, accessible system in serviceable condition. That figure is a starting point, not a quote: the honest answer is that several variables move the final price, and any company that quotes a firm number before seeing the system is either padding it or planning to revise it on site.

We give written quotes before work begins, and any repair discovered during the visit is presented as a separate priced option — never added to the invoice without your approval.

Price differences between Ajax companies are usually differences in time on site. A 20-minute visit and a 90-minute visit can carry the same line item and produce very different information.

FactorHow it affects your price
SeasonPeak October–December booking carries less schedule flexibility than spring
FindingsRepairs discovered during service are quoted separately and never auto-charged
AccessRoof pitch, storey count, and whether a ladder or scaffold is required
UnitsMultiple flues or appliances on one visit share travel but not labour
ConditionFirst service after several years takes longer than an annual maintenance visit
MaterialsStainless, cast-in-place and clay each price differently for the same repair

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When to schedule gas line & b-vent conversion in Ajax

The seasonal argument is not about price, it is about doing the work properly. Exterior repairs need temperature to cure, and a fall backlog compresses the time available for each visit.

SeasonWhat to expect
Spring (Mar–May)Best availability and pricing. Ideal for repairs — mortar cures properly above 5°C.
Summer (Jun–Aug)Quietest window. Best time for rebuilds, liner work and any project needing multiple days.
Early fall (Sep–Oct)Peak demand begins. Book 2–3 weeks ahead to secure a date before first fire.
Winter (Nov–Feb)Emergency and diagnostic work only for most exterior repairs; interior service continues.

Mistakes to avoid when hiring for gas line & b-vent conversion

The complaints we hear about other contractors in Ajax are remarkably consistent. Almost all of them trace back to one of the items below, and almost all of them are avoidable with two questions: "will I get photos?" and "is the finding written down?"

  • Sealing the symptom (caulk over a crack) instead of correcting the water path
  • Painting or sealing masonry with a non-breathable coating that traps moisture inside
  • Letting an unlicensed contractor touch a gas appliance connection
  • Hiring the crew already on the roof for another trade, without certification for this one
  • Using a hardware-store brush kit on a system that has never been scoped
  • Assuming a home inspection at purchase covered the flue; almost none do
  • Approving a rebuild quote without seeing the interior scope footage that justifies it

Included, excluded, and quoted separately

Transparency about scope prevents the single most common dispute in this trade. Here is exactly what a standard gas line & b-vent conversion visit in Ajax covers, and what is deliberately quoted separately instead of buried in the price.

  • Workmanship warranty in writing
  • Photo documentation before and after
  • Verification test on completion
  • Answers to your questions on site, in plain language, without a sales script
  • HEPA containment and complete clean-up of the work area
  • Full method service performed to manufacturer and code standard
  • Not included: Structural rebuild work discovered during inspection (quoted separately)
  • Not included: Appliance servicing that falls under a licensed gas fitter's scope
  • Not included: Third-party roof or scaffold access on unusually steep or unsafe roofs
  • Not included: Permits, where the municipality requires one

One case that explains the method

A Ajax homeowner called about a draft problem that turned out to be a kitchen exhaust fan overpowering the flue. No repair was needed at all; the answer was a make-up air adjustment and a change in how the appliance was started.

It is worth saying plainly — the value of the visit was the evidence, not the labour. Once the cause was visible, the repair itself was routine.

The standards behind the work in Ajax

Work in Durham is governed by provincial code and national standards, and insurers increasingly ask for proof that both were followed. Documentation is not paperwork for its own sake — it is what turns a denied claim into a paid one.

  • NFPA 211 levels of inspection as the reference for scope and reporting
  • Ontario Building Code and the O. Reg. 332/12 requirements governing venting and clearances
  • CSA B365 for solid-fuel burning appliances
  • Manufacturer installation instructions, which the code treats as binding
  • CSA B149.1 where a gas appliance shares the venting system
  • WETT certification standards for wood-burning system inspection

DIY versus professional gas line & b-vent conversion in Ajax

We are not precious about DIY. Sweeping leaves off a low roof, keeping the vent hood flap free, and checking the clean-out after a storm are all sensible things to do yourself.

The limit is diagnosis, not effort. Almost every serious failure we attend was invisible from the ground, and several were made worse by a well-intentioned repair that redirected water instead of removing it.

A reasonable rule for Ajax: if the task is observation, do it yourself; if the task is measurement or method, hire it out.

Documentation, quotes and next steps

You receive a photo report the same day, a written condition summary with priority ranking, and — where repairs are recommended — a fixed quote valid for 30 days. Nothing is auto-scheduled and nothing is charged without approval.

If the report flags a safety-now item, we will tell you plainly what the risk is, what happens if it is deferred, and what the minimum safe interim step is.

We run the same method in neighbouring markets — Gas Line & B-Vent Conversion in Port Hope, Gas Line & B-Vent Conversion in Newmarket, Gas Line & B-Vent Conversion in Lincoln.

FAQ

Gas Conversion in Ajax — common questions

Can I convert my wood fireplace to gas?+

Almost always. The deciding factors are gas line access to the hearth and whether the existing flue can take a listed B-vent liner.

What does a wood-to-gas conversion cost in the GTA?+

Line, install, and venting run $890–$3,400 excluding the appliance. Long gas line runs and finished-basement routing are the main cost drivers.

Is a vent-free gas log set legal in Ontario?+

No. Vent-free gas fireplace products are not approved for installation in Ontario. Every gas appliance must be vented.

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