The quick answer: 2026 cost table
A full roof replacement on a typical GTA home costs $9,000–$22,000 in 2026. Across the rest of Ontario, where labour and disposal run a little cheaper, most residential replacements land between $8,000 and $20,000. Flat roofs are priced by area: $8–$14 per square foot for TPO or modified bitumen, including tear-off and standard insulation.
Those ranges are wide because roofs are wide-ranging things. Here's how the numbers typically break out by home type for an architectural shingle replacement, full tear-off included:
| Home type | Typical roof area | Architectural shingles (installed) |
|---|---|---|
| Bungalow or small semi | 1,000–1,500 sq ft | $9,000–$13,000 |
| Two-storey semi or townhome end unit | 1,400–1,900 sq ft | $11,000–$16,000 |
| Detached two-storey | 1,900–2,600 sq ft | $14,000–$19,000 |
| Large detached, complex rooflines | 2,600+ sq ft | $17,000–$22,000+ |
| Flat roof (TPO or modified bitumen) | Priced per area | $8–$14/sq ft |
Two notes on reading that table honestly. First, roof area is not floor area — a 1,800 sq ft two-storey house might carry only 1,100 sq ft of roof, while a sprawling bungalow of the same floor area carries nearly double. Second, these figures assume a sound deck. Rot changes the math, which is the next section.
And yes — 13% HST applies to roofing labour and materials in Ontario. Any estimate that doesn't say whether HST is included is setting up a surprise for the final invoice. Ours include it.
What actually drives the price
Two houses on the same street can get quotes $6,000 apart and both quotes can be fair. Here's what moves the number:
- Deck condition. The plywood or plank deck under your shingles is the single biggest unknown in any quote. Sound deck: no extra cost. Localized rot around a chimney or valley: a few hundred dollars per sheet replaced. Widespread saturation from years of poor ventilation: thousands. A good contractor prices a per-sheet rate for deck replacement in the written estimate so there's no renegotiation mid-job.
- Pitch and complexity. A steep 10/12 roof takes staging, harnesses, and time that a walkable 4/12 doesn't. Every valley, dormer, and skylight adds cutting, flashing, and ice-and-water detail work.
- Ventilation correction. If your attic has exhaust vents but starved soffit intake — the most common defect we find on GTA reroofs — fixing it during the replacement adds modest cost and adds years to the new roof's life. Skipping it can also void shingle manufacturer warranties.
- Flashing scope. Reusing old step and counter flashing is how low bids stay low. New flashing woven into siding and chimney mortar is how roofs stay dry. The difference is real money and it belongs on the quote as a line item.
- Ice-and-water shield coverage. The Ontario Building Code requires eave protection; better installs extend the membrane well past the interior wall line and run it up every valley. More membrane, more cost, far fewer February leaks.
- Tear-off and disposal. A full tear-off with disposal of one shingle layer is standard. A roof carrying two old layers means double the debris and double the tipping fees.
- The permit. The City of Toronto and most GTA municipalities require a building permit for full replacement. It's a real cost and 2–4 weeks of lead time. A quote that's silent on the permit is usually a quote that's skipping it — which can void your insurance and surface at resale.
Repair or replace: the decision framework
Not every failing roof needs replacing. Most residential roof repairs in the GTA run $350 to $2,000: a cracked vent boot or simple flashing fix sits at $350–$700, while larger failures involving deck damage or flat-roof membrane work can reach $1,500–$2,000 or more. Against a $9,000–$22,000 replacement, repair is almost always cheaper in the short term. The question is whether it's cheaper over five years.
Our framework, the same one we use on diagnostics:
- 01
Repair when the damage is isolated and the field is healthy. A dozen wind-lifted tabs on a 12-year-old architectural roof is a repair, full stop. The surrounding shingles have a decade or more left.
- 02
Repair when flashing failed but shingles didn't. Flashing failures cause most of the leaks we diagnose. Re-flashing a chimney or sidewall costs a fraction of a re-roof, and properly installed metal flashing can outlast the shingles around it.
- 03
Replace when you're patching a roof at end of life. Spending $1,500 on a 24-year-old roof that needs replacing within 2–3 years regardless is buying time at a bad rate. Over a 5-year horizon, replacement pencils out better.
- 04
Replace when failure is broad, not local. Granule loss across whole slopes, brittle tabs that crack when lifted, or leaks appearing in a second and third location — that's a system failing, not a spot.
The honest tell: ask your contractor how many years the *rest* of the roof has left, in writing. If the answer is 8+ years, repair with confidence. If the answer is vague, get a second opinion before signing anything.
How long a roof lasts by material
How long does a roof last? In southern Ontario, with its freeze-thaw cycles and wind exposure, real-world lifespans look like this:
| Material | Realistic Ontario lifespan | What shortens it |
|---|---|---|
| Architectural asphalt shingles | 25–35 years | Poor attic ventilation, skipped ice shield, lakefront wind exposure |
| Flat membranes (TPO, EPDM, modified bitumen) | 20–30 years | Ponding water, unmaintained drains, foot traffic damage |
| Metal (standing seam) | 40–70 years | Wrong gauge, exposed fasteners, cheap paint finishes |
| 3-tab asphalt shingles | 15–20 years | Everything above, plus lower wind ratings to begin with |
The uncomfortable truth in that table: installation quality and ventilation move those numbers more than the brand on the wrapper. A 30-year shingle over a cooking, under-vented attic is a 20-year shingle. The same shingle over balanced intake and exhaust ventilation reaches its rating. When you're comparing quotes, the contractor who measured your soffit intake is quoting you a longer-lived roof than the one who didn't — even at the same price.
Location matters too. As we covered in our Etobicoke lakefront case study, roofs within a kilometre of Lake Ontario routinely show end-of-life conditions five to seven years early. If that's you, plan with the short end of these ranges.
Metal roof vs. shingles
The metal-vs-shingles question comes up on almost every replacement estimate now, so here's the straight version.
Metal lasts twice as long and sheds snow well, but costs two to three times more upfront and needs specialized installation. A standing-seam steel roof that would cost $15,000 in architectural shingles will typically land in the $30,000–$45,000 range. In exchange you get a 40–70 year service life, near-zero maintenance, and a roof that handles Ontario snow load better than anything else on the market.
When metal wins:
- You plan to own the home for 15+ years — long enough for the lifecycle math to work
- The roofline is simple enough that standing-seam panels install cleanly
- You're in heavy snow country or an exposed site where shedding matters
- You never want to think about the roof again
When shingles win:
- You may sell within a decade — you won't recoup the metal premium at resale
- The roof has complex geometry (multiple dormers, hips, valleys) where metal detailing costs balloon
- Budget is real, and a properly installed architectural shingle roof at 25–35 years is excellent value
If you do go metal, spec it properly: 24 gauge minimum, hidden fasteners, PVDF (Kynar) paint finish, and engineered snow retention above doorways. The bargain metal quotes cut exactly those four corners. Architectural shingles remain the better value for most GTA homes — we price both honestly and let the numbers decide.
How to compare quotes line by line
A cheaper quote isn't always lower quality — but you need to know what's different. The common shortcuts that make a low bid low: no ice-and-water shield, skipping the permit, reused flashing, or a lower-grade shingle quietly substituted. Here's the line-by-line comparison that surfaces all of them.
Put every quote side by side and check that each one specifies:
- 01
Full tear-off or recover. Recovering over old shingles is cheaper and hides the deck. If one quote is a tear-off and another is a recover, you're not comparing the same job.
- 02
Deck repair rate. A per-sheet price for replacing rotted decking, written in advance. No rate means a mid-job renegotiation is coming.
- 03
Ice-and-water shield coverage. Where, exactly? Eaves to how far past the interior wall line? All valleys? Around penetrations?
- 04
Underlayment type. Synthetic vs. 15 lb felt.
- 05
Flashing scope. New step, counter, valley, and drip edge — or 'reuse existing where serviceable', which is quote-speak for reuse everything.
- 06
Ventilation. Did anyone measure intake and exhaust? Is correction included?
- 07
Shingle line, by name. 'Architectural shingles' is not a spec. The manufacturer and product line determine the wind rating and warranty.
- 08
Permit. Included and pulled by the contractor, or your problem?
- 09
Disposal. Dumpster, tipping fees, magnet sweep for nails.
- 10
HST. Included in the number, or waiting to add 13% at the end?
- 11
Warranties, both kinds. Manufacturer warranty on materials *and* the contractor's workmanship warranty, in writing — they cover different failures and you need both.
What's in a Blue Knight written estimate
We built our estimate format around the checklist above, because we got tired of homeowners comparing our itemized number against a one-line phone quote. Every Blue Knight roof replacement estimate includes:
- An on-roof assessment first. We measure the roof, walk the attic, check soffit intake, and photograph the deck, flashing, and any damage. No pricing from satellite photos or over the phone.
- Itemized scope. Tear-off, underlayment, ice-and-water coverage (with the exact extent), flashing replacement, ventilation work, and the shingle or membrane product by manufacturer and line.
- A written deck-repair rate. Per-sheet pricing agreed before the job starts, so a rotten valley never becomes a negotiation.
- Permit handling. We pull and manage the municipal permit and coordinate the inspection — it's part of the process, not an extra.
- HST included. The number on the estimate is the number on the invoice.
- Both warranties in writing. The manufacturer's material warranty (15–50 years depending on the line) and our transferable workmanship warranty.
- Photo documentation. You get the pictures of your deck, underlayment, and flashing as installed — useful for insurance, condo boards, or a future sale.
If you're pricing a replacement this year, start with a diagnostic rather than a sales visit — our field guide on the five pre-winter warning signs covers what a real diagnostic should check. And when you're ready for a number you can hold us to, book through the contact page and we'll put it in writing.
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Blue Knight Roofing
Building-envelope specialists across the GTA since 1999.
