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Commercial & Industrial Roofing

Commercial Roofing in Toronto & the GTA

Managing a commercial building means the roof is one line on a long budget — right up until it leaks over a tenant's stockroom. Property managers and owners usually call a commercial roofer at one of two moments: when water is already coming in, or when the capital plan says the roof is due and somebody has to put a real number beside it. Both conversations go better with a company that works on commercial flat roofs every week.

Commercial roofing in the GTA is mostly flat roofing: TPO, EPDM, modified bitumen, and the occasional old built-up tar-and-gravel system still quietly doing its job. What decides how long any of them last is drainage and detailing — drains, HVAC curbs, parapet flashings, pipe penetrations. Freeze-thaw does the real damage here. Water sits, freezes, and opens a seam a little wider every winter until it finds the deck.

Tell us the building, the approximate roof area, and what is happening up there, and we will quote it — a sectional repair, a restoration coating, or full replacement, with the trade-offs laid out. If a repair programme will honestly carry the roof another five years, we will say so. If you are pouring money into a membrane that is finished, we will say that too. The quote is free.

What this covers

  • Roof condition assessment with photos you can circulate to owners or the board
  • Flat roof systems: TPO, EPDM, modified bitumen and built-up roofing
  • Sectional repairs and membrane patching to extend service life
  • Full tear-off and replacement, staged around tenant operations
  • Drainage work — roof drains, scuppers and tapered insulation to stop ponding
  • Flashing and detail work at HVAC curbs, vents, skylights and parapets
  • Restoration coatings where the membrane is sound but aging
  • Reports for capital planning: current condition, remaining service life, options

What affects the price

  • Roof area, and how many separate sections or levels the building has
  • Whether the existing roof can be recovered or must come off entirely
  • How much wet insulation is found once the roof is opened — the honest unknown in most tear-offs
  • Rooftop equipment density; every HVAC unit and penetration is hand-detailed flashing work
  • Access — a downtown mid-rise with no laneway costs more to service than a plaza with open parking
  • Whether crews must stage around tenants, loading docks or business hours
  • Time of year, since membrane adhesives and torch work have temperature limits

Every home is different, so we don’t publish flat prices — the quote is free and based on your actual job.

Commercial Roofing near you

We take quote requests across the GTA. Local pages:

TorontoEtobicokeNorth YorkScarboroughEast YorkYorkMississaugaBramptonCaledonVaughanMarkhamRichmond HillAuroraNewmarketKingWhitchurch-StouffvilleEast GwillimburyGeorginaPickeringAjaxWhitbyOshawaClaringtonUxbridgeOakvilleBurlingtonMiltonHalton HillsHamiltonSt. CatharinesNiagara FallsGrimsbyNiagara-on-the-LakeBarrieInnisfilBradford West GwillimburyNew TecumsethKitchenerWaterlooCambridgeGuelphOrangeville

Common questions

How long does a commercial flat roof last in Ontario?
A properly installed TPO or EPDM roof typically gives 20 to 30 years; modified bitumen is similar, and old built-up roofs sometimes go longer. The range depends less on the material than on drainage and maintenance. A roof that ponds water or has failing flashings ages twice as fast in GTA freeze-thaw, whatever the membrane brochure says.
Can a commercial roof be repaired instead of replaced?
Often, yes. If the membrane is generally sound and the trouble is localized — a failed seam, a bad curb flashing, one ponding area — targeted repairs are the sensible spend. Replacement is the right call when the insulation is saturated across large areas or leaks keep appearing in new places. A core cut and moisture scan settles the question with evidence, not opinion.
Will roofing work disrupt our tenants?
Some, but it is manageable with planning. Tear-offs are noisy and adhesives can carry odour into fresh-air intakes, so we sequence sections, coordinate with your property manager on HVAC shutdowns, and keep loading areas clear. Most tenants notice the first day and forget about it after that. What tenants really notice is a leak over their inventory, which is the thing the work prevents.
Do we need a building permit to replace a commercial roof in Toronto?
A like-for-like membrane replacement generally does not need a building permit, but structural changes do — adding rooftop equipment loads, altering the deck, or changing drainage design can trigger OBC review. Requirements vary by municipality across the GTA, so we confirm what applies to your specific building before work is priced and scheduled.
What time of year is best for commercial roofing in the GTA?
Late spring through fall is ideal — membranes and adhesives want warm, dry conditions. That said, emergency repairs happen year-round, and winter sectional work is possible with the right materials. If your roof is due, get the assessment done in fall or winter so you can budget properly and book a spring slot before the season fills up.

Ready to sort out your commercial roofing?

Tell us what your roof needs — one small repair or a complete replacement — and get a free quote.

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