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Fire-Risk Map · 2026 · Markham

Markham Dryer Vent Fire-Risk Map

TL;DR

In Markham, three vent configurations account for the majority of dryer-related fires: (1) flex-foil transition ducts over 8 ft, (2) any run over 25 ft with more than two 90° elbows, and (3) rooftop terminations without a proper backdraft damper. Cleaning + code-legal rebuild runs $189–$650. Same-week booking across Markham.

Call (437) 475-3344

Why Markham homes are high-risk

Ontario Building Code 6.3.4 caps a dryer duct at 7.5 m equivalent length (each 90° elbow counts as 1.2 m). Most $Markham townhouses and infill semis exceed that by design — the laundry is buried in a mid-house closet with a 30-ft run to the exterior wall. That's a lint trap by geometry.

Add flexible foil ("slinky") transition duct — technically illegal under CAN/CSA — and you get the exact setup behind ~2,900 dryer fires a year in North America (NFPA).

Warning signs (any one = book a service)

  • Clothes take more than one cycle to dry.
  • Dryer top or laundry room feels hotter than normal at end of cycle.
  • Burnt-lint smell during operation.
  • External vent hood flapper doesn't open, or lint visible on siding around it.
  • Last cleaning was over 12 months ago.

Markham pricing (2026)

  • Standard clean (up to 15 ft, ground floor): $189
  • Long run / townhouse clean (up to 30 ft): $259–$329
  • Rooftop termination clean: $349–$459
  • Full code-legal rebuild (rigid smooth-wall, sealed joints): $650–$1,400
  • Booster fan install (runs over 25 ft): $450–$780

Our code-legal rebuild spec

  • Rigid galvanized 4" smooth-wall duct — no foil, no vinyl.
  • All joints sealed with UL-181 foil tape (not sheet metal screws — screws catch lint).
  • Minimum 45° elbows where possible; each 90° counted against total length.
  • Backdraft damper at termination, birds/rodent screen on hood only if code-approved (¼" mesh maximum).
  • End-user reset card left at the appliance with duct length and cleaning interval.

Neighborhood-by-neighborhood in Markham

Different Markham building types drive different vent failures. Below: risk profile and typical fix per neighborhood.

Markham

Unionville

  • Dominant build type in Unionville: modern infill 2-storey — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Unionville: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Unionville; emergency (no dry / overheat) same-day.
Markham

Markham Village

  • Dominant build type in Markham Village: modern infill 2-storey — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Markham Village: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Markham Village; emergency (no dry / overheat) same-day.
Markham

Milliken

  • Dominant build type in Milliken: modern infill 2-storey — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Milliken: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Milliken; emergency (no dry / overheat) same-day.
Markham

Berczy Village

  • Dominant build type in Berczy Village: post-war bungalow — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Berczy Village: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Berczy Village; emergency (no dry / overheat) same-day.
Markham

Cathedraltown

  • Dominant build type in Cathedraltown: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Cathedraltown: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Cathedraltown; emergency (no dry / overheat) same-day.
Markham

Cornell

  • Dominant build type in Cornell: post-war bungalow — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Cornell: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Cornell; emergency (no dry / overheat) same-day.
Markham

Wismer

  • Dominant build type in Wismer: post-war bungalow — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Wismer: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Wismer; emergency (no dry / overheat) same-day.
Markham

Greensborough

  • Dominant build type in Greensborough: 1½-storey detached — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Greensborough: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Greensborough; emergency (no dry / overheat) same-day.
Markham

Angus Glen

  • Dominant build type in Angus Glen: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Angus Glen: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Angus Glen; emergency (no dry / overheat) same-day.
Markham

Buttonville

  • Dominant build type in Buttonville: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Buttonville: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Buttonville; emergency (no dry / overheat) same-day.
Markham

Thornhill Markham

  • Dominant build type in Thornhill Markham: modern infill 2-storey — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Thornhill Markham: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Thornhill Markham; emergency (no dry / overheat) same-day.
Markham

German Mills

  • Dominant build type in German Mills: post-war bungalow — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in German Mills: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across German Mills; emergency (no dry / overheat) same-day.
Markham

Grandview

  • Dominant build type in Grandview: post-war bungalow — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Grandview: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Grandview; emergency (no dry / overheat) same-day.
Markham

Aileen-Willowbrook

  • Dominant build type in Aileen-Willowbrook: 1½-storey detached — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Aileen-Willowbrook: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Aileen-Willowbrook; emergency (no dry / overheat) same-day.
Markham

Bayview Glen

  • Dominant build type in Bayview Glen: modern infill 2-storey — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Bayview Glen: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Bayview Glen; emergency (no dry / overheat) same-day.
Markham

Bayview Fairways

  • Dominant build type in Bayview Fairways: modern infill 2-storey — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Bayview Fairways: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Bayview Fairways; emergency (no dry / overheat) same-day.
Markham

Royal Orchard

  • Dominant build type in Royal Orchard: 1½-storey detached — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Royal Orchard: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Royal Orchard; emergency (no dry / overheat) same-day.
Markham

Commerce Valley

  • Dominant build type in Commerce Valley: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Commerce Valley: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Commerce Valley; emergency (no dry / overheat) same-day.
Markham

Cachet

  • Dominant build type in Cachet: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Cachet: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Cachet; emergency (no dry / overheat) same-day.
Markham

Victoria Square

  • Dominant build type in Victoria Square: 1½-storey detached — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Victoria Square: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Victoria Square; emergency (no dry / overheat) same-day.
Markham

Box Grove

  • Dominant build type in Box Grove: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Box Grove: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Box Grove; emergency (no dry / overheat) same-day.
Markham

Legacy

  • Dominant build type in Legacy: modern infill 2-storey — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Legacy: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Legacy; emergency (no dry / overheat) same-day.
Markham

Rouge Fairways

  • Dominant build type in Rouge Fairways: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Rouge Fairways: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Rouge Fairways; emergency (no dry / overheat) same-day.
Markham

Rouge River

  • Dominant build type in Rouge River: 1½-storey detached — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Rouge River: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Rouge River; emergency (no dry / overheat) same-day.
Markham

Rouge Woods

  • Dominant build type in Rouge Woods: 1½-storey detached — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Rouge Woods: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Rouge Woods; emergency (no dry / overheat) same-day.
Markham

Devil's Elbow

  • Dominant build type in Devil's Elbow: post-war bungalow — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Devil's Elbow: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Devil's Elbow; emergency (no dry / overheat) same-day.
Markham

Old Markham Village

  • Dominant build type in Old Markham Village: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Old Markham Village: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Old Markham Village; emergency (no dry / overheat) same-day.
Markham

Bullock

  • Dominant build type in Bullock: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Bullock: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Bullock; emergency (no dry / overheat) same-day.
Markham

Vinegar Hill

  • Dominant build type in Vinegar Hill: modern infill 2-storey — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Vinegar Hill: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Vinegar Hill; emergency (no dry / overheat) same-day.
Markham

Raymerville

  • Dominant build type in Raymerville: townhouse / semi — average vent run 18–32 ft.
  • Most common failure: flex-foil transition + over-length rigid, no booster fan.
  • Typical service in Raymerville: full clean + rebuild first 6 ft in rigid smooth-wall.
  • Same-week booking across Raymerville; emergency (no dry / overheat) same-day.

FAQ — Dryer Vent Risk in Markham

How often should I clean my dryer vent in Markham?+

Annually for single-family homes, every 6 months for townhouses with long runs, and every 3 months for shared-stack condo buildings.

Can I DIY this?+

You can vacuum the lint trap housing safely. Full duct cleaning requires a rotary brush kit and access to the roof or exterior termination — not a homeowner job in most Markham configurations.

Do you handle rooftop terminations?+

Yes — fully insured, safety-tied, WSIB-covered. Rooftop cleans are our specialty on Markham townhouses and infill homes.

Will my landlord/condo cover this?+

In-suite vents are almost always tenant/owner responsibility. Vertical stacks in condo buildings are common-element and covered by the condo corporation.

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