On-Site Days vs. Total Project Time: The Distinction That Matters
How long does it take to replace a roof? If you’re asking about the crew physically working on your house, the answer is 1 to 3 days for asphalt shingles and 3 to 5 days for metal. But if you’re asking how long the whole process takes from signing a contract to final inspection, you’re looking at 2 to 8 weeks depending on material, permits, and season.
That gap catches people off guard. We’ve tracked crew hours on every project since 2012, and the pattern is consistent: homeowners budget mentally for the on-site portion but don’t account for the permit queue at their municipality, the 10-to-14-day lead time on specialty materials, or the two-week booking window during July and August. Generic roofing articles rarely separate these two timelines, which leads to frustration when your “two-day job” stretches across a month on the calendar.
How Long Does It Take to Roof a 1500 Sq Ft House?
For a standard 1,500-square-foot bungalow with a single-layer tear-off, our crews typically finish in 1 to 2 days using GAF Timberline HDZ or IKO Cambridge shingles. A two-storey home of the same footprint adds roughly half a day because of the steeper pitch and extra scaffolding setup. In our experience, the real variable isn’t square footage alone; it’s the number of roof penetrations (vents, skylights, chimneys) and whether the existing decking needs replacement.
Under the Ontario Building Code (OBC 9.26), a maximum of two shingle layers is permitted before a full tear-off is required. If your home already has two layers, budget an extra half-day for stripping and disposal. We’ve seen this add $800 to $1,500 CAD in labour and dump fees on GTA projects.
Does Roof Complexity Affect the Timeline?
Absolutely. A simple gable roof on a 1,500-sq-ft home might wrap up in a single day, while a hip-and-valley design with dormers on the same footprint can stretch to 2.5 days. We always walk the roof during the estimate to count valleys, transitions, and flashing points, because each one adds 30 to 60 minutes of detailed work.
What About Weather Delays in Ontario?
Rain is the most common delay. Shingles like Owens Corning Duration and BP Mystique require dry decking for proper adhesion, so even a brief morning shower can push the start to afternoon. During spring and fall shoulder seasons, we build one buffer day into every schedule. In winter, cold-weather installation is possible above -10°C with hand-sealing, but it slows production by roughly 25%.
Average Cost of Roof Replacement in Canada (2025-2026)
The average cost of roof replacement for a typical Canadian home ranges from $7,000 to $15,000 CAD for asphalt shingles and $18,000 to $35,000 CAD for standing-seam metal, depending on region, roof size, and material grade. Here’s how the most common options compare:
| Material | Cost per Sq Ft (CAD, Installed) | Typical Lifespan | On-Site Install Time (1,500 sq ft) |
|---|---|---|---|
| 3-tab asphalt | $4.00 – $5.50 | 15 – 20 years | 1 – 1.5 days |
| Architectural shingle (e.g., CertainTeed Landmark) | $5.50 – $8.00 | 25 – 30 years | 1 – 2 days |
| Premium laminate (e.g., IKO Dynasty) | $7.00 – $9.50 | 30 – 40 years | 1.5 – 2.5 days |
| Standing-seam metal | $12.00 – $18.00 | 40 – 60 years | 3 – 5 days |
| Stone-coated steel (e.g., Decra) | $10.00 – $15.00 | 40 – 50 years | 3 – 4 days |
| Flat roof TPO (e.g., Mule-Hide TPO) | $8.00 – $12.00 | 20 – 30 years | 2 – 3 days |
| Flat roof EPDM (e.g., Carlisle EPDM) | $7.00 – $11.00 | 20 – 30 years | 2 – 3 days |
Permit costs vary by municipality. In Toronto, a roofing permit runs $250 to $400 CAD with a 5-to-10-business-day turnaround. Smaller Ontario municipalities may not require a permit for a like-for-like shingle replacement, but always confirm with your local building department.
How Much Is a Metal Roof?
How much does metal roofing cost? For a 1,500-sq-ft home, expect to pay $18,000 to $27,000 CAD installed for standing-seam steel and $15,000 to $22,500 CAD for stone-coated steel panels like Decra stone-coated steel. Corrugated metal is the budget option at $10,000 to $16,000 CAD, though it’s less common on residential projects in Ontario.
From our installs, the price jump from asphalt to metal is roughly 2x to 2.5x, but the payback comes through longevity (40 to 60 years vs. 25 to 30), lower maintenance, and insurance discounts that some providers offer for non-combustible roofing. We’ve seen homeowners in northern Ontario recoup 8% to 12% on their premiums after switching to metal.
Do Metal Roofs Prevent Ice Dams?
Metal roofs significantly reduce ice dam formation but don’t eliminate it entirely. The smooth surface sheds snow before it can melt, refreeze, and back up under shingles. On projects we’ve completed in Barrie and Muskoka, homeowners report far fewer ice dam issues after switching from asphalt to metal. However, proper attic ventilation and insulation per OBC 9.19 remain essential. A metal roof on a poorly ventilated attic will still develop ice dams at the eaves, just less severe ones than asphalt would.
Does a New Roof Help with Insulation?
A new roof itself doesn’t add significant R-value, but the process of replacing a roof creates the ideal opportunity to upgrade attic insulation and ventilation. When we strip the old shingles, we can inspect the decking, seal air leaks at penetrations, and add or replace the vapour barrier before re-sheathing.
On about 40% of our tear-offs, we find compressed or water-damaged batt insulation that’s lost 30% to 50% of its rated R-value. Addressing this during the re-roof adds $1,500 to $4,000 CAD but can cut heating costs by 15% to 25% in older Ontario homes. The National Building Code of Canada (NBC 9.25) sets minimum attic insulation at R-50 for climate zone 6, which covers most of southern Ontario.
Should You Upgrade Ventilation at the Same Time?
Yes, and it’s far cheaper to do it during a re-roof than as a standalone project. Adding ridge vent and soffit intake to meet the 1:300 ventilation ratio (OBC 9.19.1) typically costs $600 to $1,200 CAD when done alongside a shingle replacement. Proper ventilation extends shingle life by reducing attic heat buildup, which is why manufacturers like GAF and Owens Corning require balanced ventilation for full warranty coverage.
Factors That Extend or Shorten Your Timeline
Several variables determine whether you’ll replace a roof in one day or one month:
- Permit lead time: 0 days (no permit required) to 15 business days in busy municipalities.
- Material availability: Standard colours of GAF Timberline HDZ or IKO Cambridge ship in 3 to 5 days. Custom metal panels can take 3 to 6 weeks.
- Season: June through September is peak season; expect 2-to-3-week booking delays. Late fall and early spring offer faster scheduling.
- Roof layers: A single-layer tear-off saves half a day compared to a double-layer strip.
- Structural repairs: Rotted decking or rafter damage discovered during tear-off can add 1 to 3 days and $1,000 to $5,000 CAD.
Step-by-Step: What Happens When You Replace a Roof
Here’s the typical sequence we follow on a residential re-roof in Ontario:
- Inspection and estimate (Day 1): Walk the roof, measure, photograph problem areas, and provide a written quote.
- Contract and permit (Week 1-2): Sign the agreement, pull permits if required, and order materials.
- Material delivery (Week 2-3): Shingles, underlayment, flashing, and venting arrive on-site.
- Tear-off (Install Day 1): Strip old shingles, inspect decking, replace damaged sheets.
- Underlayment and flashing (Install Day 1-2): Apply ice-and-water shield at eaves and valleys, synthetic underlayment on the field, and step/counter flashing at walls and chimneys.
- Shingle or panel installation (Install Day 1-3): Lay starter strip, field shingles, hip and ridge caps.
- Cleanup and inspection (Final Install Day): Magnetic sweep for nails, gutter flush, and walkthrough with the homeowner.
- Municipal inspection (1-2 weeks post-install): If a permit was pulled, the building inspector signs off.
Frequently Asked Questions
Can You Replace a Roof in the Rain?
No. Wet decking compromises adhesion and can trap moisture under the new shingles, leading to mould and premature failure. If rain starts mid-project, crews tarp the exposed sections and resume once the surface dries. We’ve had projects where a single rain day pushed a 2-day install to 4 calendar days.
How Do I Know It’s Time to Replace a Roof?
Look for curling or missing shingles, granule loss in your gutters, daylight visible through the attic decking, or a roof age beyond 20 years for architectural shingles. If repairs exceed 30% of the replacement cost, it’s usually more economical to replace the entire roof.
Is It Cheaper to Roof Over Existing Shingles?
A roof-over saves $1,000 to $2,500 CAD in tear-off and disposal costs, but it voids most manufacturer warranties, hides underlying damage, and is limited to one overlay per OBC 9.26. We generally advise against it unless the existing layer is in good condition and the homeowner plans to sell within 5 years.
Wrapping Up
When you replace a roof, the on-site work is the fastest part of the process. A typical 1,500-sq-ft Ontario home takes 1 to 3 days of crew time for asphalt shingles and 3 to 5 days for metal, but the full project lifecycle, including permits, material lead times, and scheduling, stretches to 2 to 8 weeks. Understanding that distinction helps you plan realistically, avoid surprises, and make better decisions about timing, materials, and budget. The best time to start planning is 6 to 8 weeks before you want the work done, especially if you’re booking during peak season.
