Roof size and pitch
The biggest factor. Steeper roofs need more safety setup, more time, and more material per square foot of floor.
Typical Ottawa roof replacement prices
Asphalt shingle installed, based on roof area (roof area runs larger than floor area because of pitch and overhangs). Tear-off and disposal of the old roof add $0.80 to $1.60 per square foot. All prices are before HST, and every roof is quoted exactly after a free inspection.
Bungalow
$8,000 to $13,000
Roof area around 1,700 sq ft
1 to 2 days on site
Tear-off and disposal extra
Ice-and-water shield at eaves and valleys
Architectural shingles installed
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Two-storey home
$7,200 to $12,000
Roof area around 1,600 sq ft
1 to 2 days on site
Tear-off and disposal extra
New flashing at walls and penetrations
Balanced ridge and soffit ventilation
Large or steep roof
$14,000 to $24,000+
Roof area 3,000+ sq ft or steep pitch
2 to 4 days on site
Extra safety setup and access time
Complex valleys, dormers, skylights
Premium shingle options available
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1. What do you need?
2. Area to cover
sq ft
2. Repair type
3. Shingle grade
4. Add-ons
What moves the price
Decking condition
Soft or rotted sheathing found at tear-off is replaced per sheet; we price the allowance in writing up front.
Layers to tear off
A roof with two old layers costs more to strip and dispose of than a single layer.
Shingle grade
Architectural shingles cost more than 3-tab but last longer and look better. Most Ottawa homeowners choose them.
Details and penetrations
Chimneys, skylights, valleys, and wall junctions all need proper flashing work, and they add up.
Material choice
Metal runs roughly two to three times the cost of shingle; flat membrane systems price higher per square foot than shingle.
What you are paying for
A roof replacement price is mostly labour and system components, not just shingles. A proper Ottawa re-roof includes the tear-off and disposal, replacing any soft decking, ice-and-water shield at the eaves and valleys where ice dams push water uphill, underlayment across the deck, new flashing at every wall, chimney, and penetration, the shingles themselves, and balanced attic ventilation so the new roof is not cooked from below. Skip any of those and the price drops, and so does the lifespan. That is usually the story behind a too-good quote.
Cost by house size, honestly
A typical Ottawa two-storey carries about 1,600 sq ft of roof, which at our rates is $7,200 to $12,000 for a shingle roof, with tear-off and disposal of the old roof extra. Roof area runs larger than a house's footprint because of pitch and overhangs, so a bungalow with the same floor area has more roof and costs more, and large or steep roofs cost more again. Metal roofing runs roughly two to three times shingle up front and lasts twice as long; flat and low-slope membranes are priced per roof because drainage and detailing drive the work.
Roof area is measured in squares
Roofers price the roof surface, not the living space. One roofing square is 100 square feet of roof. A bungalow and a two-storey house with the same floor area can need very different amounts of roofing, because the bungalow's whole floor sits under one roof. Ask every roofer for the measured number of squares so you compare quotes on the same roof.
Prices before and after HST
Ontario HST is 13%, and RoofRoof's quoted rates do not include it. On a $8,000 to $18,000 re-roof, HST is $1,040 to $2,340, for $9,040 to $20,340 in total. Check whether each quote you compare includes it, because a $15,000 quote before tax ($16,950 with HST) costs more than a $16,000 quote that already includes it.
When a repair is the smarter spend
If your roof is generally sound and the problem is local (a flashing, a valley, some wind-lifted shingles), a roof repair at $300 to $1,200 is the right call, and that is what we will quote. We only recommend replacement when the roof is genuinely at the end of its life, and we will show you why on your own photos.
Financing
Financing is available upon request. Ask when you book your inspection and we will walk you through the options before you commit to anything.
Roof cost FAQs
How much does a roof replacement cost in Ottawa?
Most asphalt shingle replacements land around $4.50 to $7.50 per square foot installed, typically $8,000 to $18,000 for a detached home, depending on size, pitch, shingle grade, and decking condition. Larger or steeper roofs can run past $20,000.
Do your prices include HST?
No. Our quoted rates and the prices on this page are before HST. Ontario HST of 13% is added on top, so a $10,000 re-roof comes to $11,300.
How much does a metal roof cost compared to shingle?
Roughly two to three times the up-front cost of shingle. The honest comparison is over time: a shingle roof is replaced about every 25 years, while a metal roof is installed once and lasts 40 to 50+ years.
Why do roofing quotes differ so much between companies?
Usually scope, not margin. A low quote often skips the tear-off, ice-and-water shield, new flashing, or a decking allowance, the things that decide whether the roof lasts. Compare quotes line by line, and be careful with any quote far below the market range.
Do you offer financing?
Yes. Financing is available upon request. Ask when you book your free inspection and we will walk you through the options.
Is the estimate really free, and is it exact?
Yes and yes. We inspect, measure, and give you an itemized written price: tear-off, decking allowance, materials, ventilation, and clean-up. If the inspection turns up something that changes the price, you hear it from us before any work starts.