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Roof Replacement in Canada: what's involved, what it costs, and how to hire
CentFix
Updated regularly · Canada-wide
Most people searching for roof replacement want two things: someone who has done it before, and a number they can trust. Both are easier to get when you describe the job properly the first time.
CentFix is a matching service. You describe the job once and we connect you with independent roofing contractors who serve your address. Licensing, insurance, warranties and reviews belong to the individual businesses that earned them.
Everything below is written for roof replacement specifically: scope, what pushes a price up or down, realistic timelines, the rules that apply in Canada, and the questions worth asking before anyone starts.
What roof replacement involves
Roof Replacement sits within roofing work, so the same fundamentals apply: proper assessment first, then the work itself, then a check that the result holds up. A roofer who quotes without looking is quoting the job they hope it is.
A complete roof includes the deck, the underlayment and ice and water membrane, the covering itself, the flashing at every penetration and transition, and the ventilation that keeps the attic close to outdoor temperature. Skip any one of those and the others fail early.
Repairs are targeted work: replacing damaged shingles, resealing or replacing flashing around a chimney or vent, fixing a valley, or dealing with the aftermath of ice damming. A useful repair visit includes finding the actual entry point, which is often uphill of where the stain appears inside.
- Asphalt shingle repair and full replacement
- Metal roofing, including standing seam and steel panel systems
- Flat and low-slope systems on additions, garages and commercial buildings
- Flashing work at chimneys, skylights, valleys, walls and vents
- Attic ventilation and insulation corrections tied to ice damming
- Eavestrough, soffit and fascia work carried out with the roof
What to expect when the roofer arrives
The first visit for roof replacement is mostly about scope. Expect questions about how long the issue has been there, what's been done before, and how the space is used, because all three change the recommendation.
- A walkthrough or a few questions before anything is quoted, so the price reflects your property rather than an average
- A clear description of what's included in roof replacement and what would be treated as extra
- Protection of the surrounding area, and cleanup when the work is finished
- Written pricing, with a note of anything that could change once work is underway
- A plain answer on the warranty: how long it runs and what it actually covers
Describe the job once and independent roofing contractors nearby come back with quotes you can compare.
What affects the price of roof replacement
Size is the obvious factor, but pitch and complexity move the number more than square footage alone. A steep roof needs staging and slows every stage of the work. Multiple valleys, dormers, skylights and chimneys each add flashing detail, and flashing is where the labour hours go.
What is under the shingles is the wild card. Quotes normally include an allowance for a certain amount of deck replacement, with additional sheets priced individually. Ask what that allowance is, because a roof that has been leaking quietly for a few winters can need considerably more.
Access and disposal round it out. A narrow lot with no room for a bin, a house on a slope, or a property where materials have to be carried rather than hoisted all add time. Tear-off waste disposal is a real cost, and a quote that omits it is not comparable to one that includes it.
- Roof area, pitch and the number of valleys, dormers and penetrations
- Tear-off versus overlay, and how many existing layers are up there
- Material choice, from basic three-tab through architectural shingles to metal
- Deck condition and how much sheathing needs replacing
- Flashing, ventilation and eavestrough work bundled into the job
- Site access, staging requirements and disposal of the old material
How long the work takes and how soon someone can come
Most residential asphalt replacements are one to three days once the crew starts, weather permitting. Repairs are usually a single visit. The unpredictable part is scheduling rather than duration, because roofing is weather dependent and one rainy week pushes every job behind it.
After a significant storm, expect delays and be careful about who shows up at the door. Legitimate local contractors are busy in those weeks, and out-of-town crews who appear immediately after hail are the source of a large share of roofing complaints in this country.
How to choose the right roofer for this job
Look at what the quote specifies rather than the total. It should name the shingle product, the underlayment, where ice and water membrane goes, whether flashing is new, what ventilation is being installed, and how much deck replacement is included.
Insurance and workers' compensation coverage matter more on a roof than almost anywhere else, because the work happens at height. Ask for current certificates rather than assurances.
- Liability insurance and current workers' compensation coverage for everyone on the roof
- A written scope naming materials, membrane coverage and flashing details
- A stated deck replacement allowance and the per-sheet price beyond it
- Workmanship warranty length, in writing, separate from the manufacturer warranty
- A local business address and a history in your area, not a phone number from three provinces away
Questions to ask before you book roof replacement
You don't need to know the trade to ask good questions. These are the ones that tell you whether a company has actually thought about your job.
- Have you done roof replacement on a property like mine recently?
- Is this a tear-off, and how many layers are coming off?
- How far up the roof does the ice and water membrane go?
- Is all the flashing being replaced, or reused?
- What ventilation is included, and does it fix the ice damming I have had?
- How much deck replacement is in the price, and what is the rate beyond it?
- What does your workmanship warranty cover, and is it transferable if I sell?
Compare quotes for roof replacement from roofing contractors working in your area. It costs you nothing.
Permits, rules and who is allowed to do the work
Permit requirements for reroofing vary by municipality. Straight replacement often does not need one, while structural work, changes to the roof line, or work on some flat systems does. The contractor should know the local rule and say so plainly.
Insurance claims for storm damage have their own timelines and documentation requirements. Photograph the damage, keep records, and be cautious about signing anything that assigns your claim benefits to a contractor before you understand what you are agreeing to.
Manufacturer warranties on shingles usually depend on correct installation and adequate ventilation. A cheap job can void the very warranty that made the material attractive, which is one more reason the ventilation line in a quote is worth reading.
Seasonal timing and Canadian conditions
Asphalt shingles seal properly in mild weather. Installs in deep cold need hand sealing and extra care, which is why late spring through early autumn is the preferred window across most of the country.
Winter brings its own set of calls: ice damming at the eaves, leaks that only appear during a thaw, and wind damage after storms. Emergency tarping and temporary repairs are normal in those months, with permanent work scheduled once conditions allow.
Common mistakes that cost homeowners money
The cheapest roof usually costs the most over ten years. Most premature failures we hear about trace back to an overlay that hid a soft deck, flashing that was reused because it looked fine, or ventilation that was never addressed even though the attic was clearly the reason the eaves iced up every February.
- Choosing an overlay to save money and losing the chance to inspect the deck
- Reusing old flashing around chimneys and skylights
- Ignoring attic ventilation while replacing the shingles above it
- Signing with a storm-chasing crew that has no local presence
- Paying a large deposit up front before any material arrives
Keeping the work in good shape afterwards
Roofs mostly need looking at rather than working on. Twice a year and after major storms is enough to catch the small problems while they are still small.
- Clear eavestroughs in autumn so meltwater has somewhere to go
- Check flashing around chimneys and skylights after windstorms
- Watch the attic for daylight, staining or damp insulation
- Keep overhanging branches trimmed back off the surface
- Deal with ice damming at the source, ventilation and insulation, rather than chipping at the ice
Where CentFix fits in
CentFix does not do roofing work. We take one clear description of your roof replacement job and put it in front of independent roofing contractors who already work in your area, so you get several real quotes instead of spending an afternoon leaving voicemails.
Homeowners never pay us. The professionals you hear from run their own businesses, carry their own licensing and insurance, and stand behind their own work.
