How Much Does a Roof Replacement Cost in Ottawa? 2026 Prices by Home Size
| Key takeaway | Direct answer |
|---|---|
| Typical 2026 asphalt-shingle planning range | $8,000 to $22,000 before HST for many standard Ottawa homes. |
| Small home guide range | $8,000 to $11,000 before HST for homes up to 1,200 sq. ft. |
| Medium home guide range | $11,000 to $16,000 before HST for homes from 1,200 to 2,000 sq. ft. |
| Large home guide range | $16,000 to $22,000 before HST for homes from 2,000 to 3,000 sq. ft. |
| Ontario HST | 13%. |
| Main cost drivers | Roof area, pitch, layers, access, decking, flashing, ventilation, and material |
| Basic asphalt re-shingling permit | Ottawa lists asphalt-shingle installation as work that does not require a building permit. |
| Main warning | Home floor area does not equal roof area |
A standard asphalt-shingle roof replacement in Ottawa falls within a broad planning range of $8,000 to $22,000 before HST, based on one current local 2026 cost guide.
That range works for early budgeting. It is not a RoofRoof quote. The final price depends on the measured roof, removal work, material, and deck condition after tear-off.
A current Ottawa guide reports $8,000 to $11,000 for a small home, $11,000 to $16,000 for a medium home, and $16,000 to $22,000 for a large home. It lists complex roofs above $22,000.
Ontario adds 13% HST to taxable roofing work. A $10,000 subtotal becomes $11,300. A $15,000 subtotal becomes $16,950. A $20,000 subtotal becomes $22,600. Confirm whether the written estimate includes tax.
The home size on a real estate listing gives only a rough starting point. Roofers price the roof surface. They measure the planes, slope, ridges, hips, valleys, and attached sections. They also account for waste around edges and penetrations.
A bungalow usually places more living area under one roof level. A two-storey house places part of that living area below another floor. Both homes could list the same interior square footage and carry different roof areas.
Use the Ottawa roof replacement cost guide for local planning. Use a written site estimate for the decision.
Keep a separate allowance for hidden deck repairs. The crew sees the full sheathing only after removing the old roofing. Soft plywood has poor timing. It waits until the shingles leave.
2026 Ottawa Roof Replacement Cost by Home Size
For early budgeting, use $8,000 to $22,000 before HST for a standard asphalt roof, then adjust for the roof itself.
The table below follows a published Ottawa 2026 guide. It does not represent fixed RoofRoof pricing. The source states that its figures include labour, materials, tear-off, underlayment, drip edge, ice-and-water membrane, and cleanup. It excludes items such as skylights, chimneys, and major decking repairs.
| Home-size band in the published guide | 2026 planning range before HST |
|---|---|
| Up to 1,200 sq. ft. | $8,000 to $11,000 |
| 1,200 to 2,000 sq. ft. | $11,000 to $16,000 |
| 2,000 to 3,000 sq. ft. | $16,000 to $22,000 |
| Very large or complex roof | More than $22,000 |
Treat the table as a first pass. The source groups costs by home size, but the roof measurement controls the material order and labour plan.
Before accepting a number, check five items:
- Does the estimate state the roof area?
- Does it include full tear-off and disposal?
- Does it name the shingle product?
- Does it list a price or allowance for deck repair?
- Does it show HST?
A small home with a steep, cut-up roof could cost more than a larger home with a plain roof. A garage, porch, rear addition, dormer, or low-slope section adds surface and detail work. Several old layers add removal time and disposal weight.
Access also changes the job. A clear driveway gives the crew space for materials and a disposal bin. A narrow lot, shared drive, mature trees, overhead wires, or limited parking adds handling.
The final estimate should break out separate assemblies. A house with shingles on the main roof and membrane on an addition does not have one roof system. It has two. The invoice should admit this.
For scope details, review roof replacement in Ottawa and compare the listed work with the estimate.
Roof Area Sets the Roof Replacement Price in Ottawa
Roof area, not finished floor area, sets the base quantity for shingles and labour.
Roofers measure roof surfaces in squares. One roofing square equals 100 square feet of roof area. Manufacturers use the same unit for material coverage.
A 2,000-square-foot house does not automatically have a 2,000-square-foot roof. The number of storeys changes the footprint. The slope adds surface. Garages and porches add planes. Dormers and additions add edges.
The estimate should account for:
- Total measured roof area
- Roof pitch
- Number of storeys
- Hips, valleys, and ridges
- Dormers and intersecting roof lines
- Chimneys, skylights, vents, and plumbing stacks
- Attached garages, porches, and additions
- Material waste from cuts
- Existing roof layers
- Disposal and site access
Waste is part of the material calculation. Shingles need cuts at valleys, hips, walls, penetrations, and gable ends. Owens Corning states that contractors generally add a waste factor, with the exact percentage changing by roof style and material.
Pitch also affects labour. Steeper roofs require different access, fall protection, staging, and movement. Complex geometry creates more cuts and flashing work.
Ask the estimator to state the measured roof area or explain the measurement report. The number gives you a sound basis for comparing quotes. A low total tied to a smaller measured area deserves a second look.
Also ask how many roof layers the crew will remove. The answer affects labour, bin weight, and the time needed to expose the deck.
Online calculators remain useful for a rough budget. They do not inspect the attic, lift shingles, test soft sheathing, or examine old flashing. The calculator sees dimensions. The roof keeps the rest to itself.
What a Shingle Roofing Quote in Ottawa Should Include
A complete quote names the work, materials, allowances, exclusions, tax, and warranty terms.
Avoid estimates that state only “replace roof.” That phrase leaves too much unwritten. The quote should work as a clear scope of work.
Look for these items:
- Removal of each existing roofing layer
- Disposal, bin placement, and cleanup
- Inspection of exposed decking
- A unit price or allowance for plywood and board replacement
- Ice-and-water membrane locations
- Underlayment type
- Drip edge
- Starter shingles
- Field shingles and exact product line
- Ridge-cap shingles
- Plumbing-stack boots
- Roof vents
- Wall, chimney, valley, and penetration flashing
- Magnetic nail sweep
- Material warranty terms
- Workmanship warranty terms
- Payment schedule
- HST
The quote should also state whether the crew will replace or reuse existing metal. Review the roof flashing service in Ottawa when the roof meets a chimney, wall, skylight, or another roof plane.
Ventilation belongs in the scope. The estimate should state the intake and exhaust plan, vent type, and vent count. The roof ventilation service in Ottawa page gives context for this part of the work.
Read the allowances with care. A quote might include a fixed number of plywood sheets. It might list every sheet as an extra. Either format works when the document states the terms.
Compare scopes before totals. One quote might include new flashing and deck repair. Another might exclude both. The lower number then describes less work. Arithmetic remains innocent. The paperwork caused the problem.
Request written changes when the crew finds new work. A photo, quantity, and unit price keep the decision clear.
Hidden Work Under the Shingles
Decking, flashing, ventilation, insulation, skylights, chimneys, and drainage details raise the price when they need repair or replacement.
The crew exposes the roof deck after tear-off. This inspection reveals soft plywood, split boards, old leak paths, rusted fasteners, damaged flashing, and poor previous repairs.
The quote should explain how the contractor prices hidden deck work. It should state a per-sheet rate, a per-board rate, or a defined allowance. Without that line, the homeowner learns the price after the roof opens. That is late.
Flashing creates another variable. Chimneys, sidewalls, valleys, skylights, and roof penetrations need sound metal details. Sealant does not replace failed flashing. It covers it for a while and leaves the next rain to file a report.
Attic conditions also affect the scope. Blocked soffit intake, damaged baffles, disconnected bath ducts, damp insulation, or an undersized exhaust plan require separate work. Review attic insulation in Ottawa when the attic shows moisture or insulation problems.
Other roof details deserve separate lines:
| Roof detail | Quote item to check |
|---|---|
| Skylight | Flashing kit, curb work, unit replacement, interior repair |
| Chimney | Step flashing, counterflashing, cap work, masonry work |
| Eavestrough | Removal, protection, reset, replacement, guard adjustment |
| Low-slope addition | Separate membrane system and edge details |
| Several roof layers | Extra tear-off labour and disposal |
Use the skylight installation page, chimney cap page, and eavestrough page to review related scope items.
Do not assume every roof needs all of this work. Do not assume the existing parts will remain. Ask the estimator to identify visible concerns and state how the contract handles concealed damage.
Metal Roofing and Flat Roofing Need Separate Budgets
Do not apply an asphalt-shingle price to a metal or flat roof. Each system uses different materials, labour, and details.
A 2026 Canadian cost guide lists lower-cost sheet-metal roofing at $8 to $16 per square foot and standing-seam panels at $12 to $25 per square foot. These are broad national guide figures, not Ottawa quotes.
A metal quote should identify:
- Panel or shingle system
- Metal type
- Gauge or thickness
- Coating
- Fastener system
- Underlayment
- Flashing package
- Snow-control details
- Tear-off method
- Deck requirements
- Ventilation plan
“Metal roof” does not identify one product. Exposed-fastener panels, standing seam, and metal shingles use different parts and installation methods.
Flat and low-slope roofs need their own scope. A 2026 Canadian renovation guide reports at least $13,000 for a 1,000-square-foot flat roof, depending on the project. Use that figure only as a broad reference.
A flat-roof estimate should state the membrane, thickness, insulation, substrate work, drainage, edge metal, flashing, seams, penetrations, and removal plan. Wet insulation or damaged substrate changes the job after opening.
Many Ottawa homes mix systems. The main roof might use shingles. A rear addition might use membrane. A porch might use metal. Price each section under its own heading.
This keeps the estimate readable. It also prevents a broad total from hiding a thin scope.
HST, Ottawa Permits, Access, and Storm Claims
Add 13% HST, check permit rules for structural work, and keep storm claims separate from planned replacement work.
Ontario charges 13% HST on taxable supplies. Confirm whether the estimate shows tax in the subtotal or final total.
The City of Ottawa lists asphalt-shingle installation as work that does not require a building permit. The exemption does not apply in the same way to designated heritage buildings or buildings within a Heritage District Overlay. Structural roof repairs require a building permit. Confirm the rule for the address and exact scope before work starts.
Access affects the quote. The crew needs room for delivery, ladders, fall protection, debris, and a disposal bin. Site limits increase carrying and handling.
Conditions differ across the city. A project in Kanata might include a broad garage roof. A project in Barrhaven might involve a townhome block and shared access. A project in Nepean might include an older addition with another roof system. The neighbourhood name does not set the price. The measured work does.
Storm damage needs separate records. Photograph missing shingles, damaged vents, fallen branches, ceiling stains, and temporary protection. Contact the insurer and follow the policy instructions.
The Insurance Bureau of Canada states that standard home and business policies cover hail or wind damage, including damage from falling branches and water entering through a storm-created opening. Pre-existing damage is not covered. Policy wording still controls each claim.
Keep storm damage roof repair and emergency roof repair separate from the planned replacement scope. Separate files make the insurer, homeowner, and contractor read the same story.
Roof Replacement Cost Ottawa FAQs
Use the answers below for budgeting, then rely on a measured written estimate for the project.
Is $10,000 enough for a roof replacement in Ottawa?
It fits the lower part of a current local 2026 planning range for a small or simple asphalt roof. Steep slopes, several valleys, difficult access, multiple layers, deck damage, skylights, and flashing work raise the price. Confirm whether the figure includes HST.
Does the quote include plywood?
The quote should state this. Some estimates include an allowance. Others charge a unit price for each sheet or board. Ask for the rate before tear-off.
How much should I add for HST?
Add 13% to a before-tax quote. Multiply the subtotal by 1.13.
Do I need a permit to replace asphalt shingles in Ottawa?
Ottawa lists asphalt-shingle installation as work that does not require a building permit. Structural roof repairs require one. Heritage properties need a separate check.
How long will replacement take?
The contractor should state the expected schedule after measuring the roof and reviewing access. Weather, hidden repairs, roof size, and roof shape affect the duration. The contract should also state how the crew protects exposed areas.
Should I repair or replace the roof?
Use roof repair in Ottawa for isolated damage when the surrounding system remains serviceable. Widespread wear, repeated leaks, or broad deck damage supports a replacement review. A site inspection should identify the cause and scope.
What budget should I use before getting quotes?
Use $8,000 to $22,000 before HST as a broad 2026 Ottawa planning range for a standard asphalt-shingle roof. Then adjust for roof area, pitch, layers, access, decking, flashing, ventilation, and attached roof sections.
The roof does not read the real estate listing. It presents its own measurements.