How Much Does a Metal Roof Cost in Ontario? Every Factor Explained

Metal roof cost in Ontario depends on the panel type, the size and shape of your roof and the work under the panels: tear-off, deck repairs, flashing and ventilation. Metal costs more than asphalt shingles because the material, trim and labour all cost more. Compare written quotes line by line, not by one total.

Metal roof cost in Ontario: how roofers price the job

Roofers price the actual roof surface, not the floor area of the house. Roofing is often sold by the square, and one square covers 100 square feet (about 9.3 square metres). Some quotes give a rate per square foot or per square. Others give one lump sum for the whole job.

That is why a price per square foot you find online tells you little. One figure may cover panels only. Another may include tear-off, underlayment, trim, flashing and cleanup. A low rate on a short scope can cost more once the extras are added, and a high rate on a full scope can be fair.

This page publishes no dollar figures for that reason. Treat any number as meaningless until you know exactly what it includes, then compare written quotes built on the same scope.

Work out your roof area: a simple metal roof cost calculator

A calculator or estimator can give you an area, but it cannot give you a price, because price depends on everything else on this page. You can still work out the area yourself and use it to check quotes.

1. Measure the length and width of the house footprint in metres, including any attached garage or porch under the same roof.
2. Multiply the two to get the footprint area.
3. Multiply by the pitch factor in the table below. Pitch is the rise of the roof for every 12 units of run.
4. Add the overhang on each side and some allowance for cutting waste.

A house with a 120 square metre footprint and a 6/12 pitch has about 134 square metres of roof before overhangs and waste. Divide each quote's total by the same area and the differences in scope show up quickly. Valleys, hips and dormers add cutting and waste, so a complex roof costs more per square metre than a plain gable.

Why metal roofs cost more than shingles

• Metal and thickness. Steel and aluminum are priced differently, and a thicker panel costs more.
• Coating and colour. The paint finish on the panel affects both the price and the warranty. Premium finishes and colours usually cost more.
• Profile. Standing seam panels have raised seams and hidden fasteners, so they use more material and more labour. Exposed-fastener corrugated or ribbed steel is screwed through the face of the panel and generally costs less to install, but the screws and washers need checking over the years.
• Trim. Metal needs formed pieces at the eaves, rakes, ridge, hips and valleys, and each one is cut and fitted.
• Skill. Seams, trim and flashing details decide whether the roof stays watertight, so careful installation takes time.

Shingles cost less on day one, but they are replaced sooner. A fair comparison looks at the years you will keep the house.

Tear-off, deck repairs and underlayment

The work under the panels is where quotes differ most. A full tear-off adds labour and disposal, but it lets the crew inspect the deck. Soft or rotted sheathing is replaced before new roofing goes on. Nobody can see how much is damaged until the old roof is off, so a good quote states how hidden deck repairs are priced and says the crew will get your approval first.

Underlayment is the next line. Ask which product is used and whether it is rated for use under metal. A self-adhering ice and water membrane along the eaves and in the valleys protects against ice damming, and Natural Resources Canada recommends an ice-shield membrane when re-roofing. A synthetic underlayment covers the rest of the deck.

Some owners ask whether skipping the tear-off saves money. It saves labour and disposal, but it hides the deck and adds strapping or underlayment work, so the saving is smaller than people expect. Ask each roofer to price it both ways in writing.

Flashing, ventilation and snow guards

Flashing is the metal or membrane that seals every place the roof meets something else: walls, chimneys, skylights, vent pipes and valleys. Step and counter flashing at walls and chimneys takes time to cut and fit. A roof with many penetrations has more of it. The exterior flashing basics guide explains what each piece does.

Ventilation is a separate line. A balanced system pairs soffit intake with ridge or roof vents. If the soffit is damaged or insulation is blocking the airflow, fixing that adds work. The soffit ventilation guide covers how the pieces fit together.

Metal roofs shed snow in sheets, so quotes may include snow guards over doors, walkways and steps. A metal roof also sheds water quickly, and a 6-inch K-style trough carries more than a 5-inch one. See five-inch versus six-inch eavestroughs if the roof change affects your gutters.

Access, timing and other things that move the price

Several smaller factors shift the price from house to house:

• Height and steepness. A steep or three-storey roof needs more safety equipment and slower work.
• Site access. Trees, tight lots and no room for a bin or a material delivery add handling time.
• Roof features. Chimneys, skylights, dormers and vents all add details.
• Lead time. Panels and trim are often made to order, so colour and profile choices affect scheduling. The material lead times guide explains why.
• Season. Shingles need warm weather to seal fully. Metal does not depend on heat to seal, but cold, snow, ice and wind affect safety and the schedule.
• Permits. Ask your municipal building department whether the job needs one and who will apply for it.

How to compare written metal roof quotes

Put the quotes side by side and check that each one names:

• The metal, the thickness, the profile, the coating and the colour.
• The underlayment, and the ice and water membrane coverage.
• Tear-off, disposal and cleanup.
• How hidden deck repairs are priced and approved.
• All flashing, trim, ventilation and snow guards.
• Any eavestrough, fascia or soffit work.
• Permits, the schedule and the payment terms.
• The panel finish warranty and the installer's workmanship warranty, written separately.

Ontario's guide for home renovation and roofing businesses says contracts generally must describe the work, list the materials and products, set out warranties on goods and labour, give the total cost with taxes and payment terms, and include a schedule and the sub-trades. If an estimate is part of the contract, the contractor cannot charge more than 10 percent above it unless you sign a change to the contract. The same guide notes a 10-day cooling-off period for contracts signed at the customer's home.

D&D Exterior Finishing gives a free written estimate that lists the scope, materials, colours and warranty terms before work starts. See roofing installation and replacement, and read red flags when hiring roofing contractors before you sign.

Metal roof cost questions homeowners ask

Why are metal roofs more expensive?

Metal panels cost more than shingles, the formed trim at every edge adds to the list and installation needs more precise work and specialist skill. Complex roofs with valleys, hips and dormers cost more again. The expected life is longer, which spreads the cost over more years, but you pay it up front.

How much does steel roofing cost per foot?

It depends on what the figure covers. A per-foot number may be for panels only, or it may include tear-off, underlayment, trim and flashing. Work out your roof area, ask for a written, itemized quote and divide the total by the area. That gives you a fair way to compare.

Is a metal roof worth the extra cost?

It can be if you plan to stay in the house for a long time, because you may replace the roof once instead of twice. It is harder to justify if you may sell within a few years. Compare quotes for both materials and think about how long you will own the home.

Does putting metal over old shingles save money?

It saves tear-off labour and disposal, but it adds strapping or underlayment work and hides the deck, so any rot goes unseen. The saving is smaller than it looks. Ask for both options in writing, and ask how the deck would be checked either way.

Devon Moore, Operations Lead Co-Founder & Operations Lead — D&D Exterior Finishing

Devon Moore is the co-founder and Operations Lead at D&D Exterior Finishing, specializing in siding, roofing, windows, and exterior renovations across Waterloo Region.