Fixing a leaking roof usually costs roughly a few hundred dollars up to about $2,000 before taxes for a typical repair, such as replacing a few shingles, a flashing or a plumbing boot. Emergency, winter or after-hours work costs more. If the roof is worn out, replacement may be the better value. Price varies with size, slope, access and condition.
A drip in the ceiling has a way of ruining your whole week. You put a bucket down, you look up, and the first thing that comes to mind is: how much is this going to cost me?
The honest answer is that it depends on what’s actually causing the leak. A loose plumbing boot is a very different job from a worn-out roof. Here’s how roofers in the Montreal area usually price leak repairs, and what you can do to keep the bill reasonable.
How much does it cost to fix a leaking roof?
For most common leaks, the cost to fix a leaking roof falls somewhere between roughly a few hundred dollars and about $2,000 before taxes. That covers typical small repairs: replacing a few shingles, resealing or replacing a flashing, changing a plumbing vent boot, or patching a small area of flat-roof membrane.
The final number varies with the size of the repair, the slope of the roof, how easy it is to access, and the general condition of what’s already there. Emergency calls, winter work and after-hours visits cost more, because they’re harder and riskier for the crew.
Remember that GST (5%) and QST (9.975%) are usually added on top, for 14.975% in total.
What usually causes a roof leak
Before anyone can give you a fair price, they need to find the source. Water travels, so the stain on your ceiling is often a few feet away from the actual entry point.
- Damaged or missing shingles after a windstorm.
- Failed flashing around chimneys, skylights, walls or parapets.
- Cracked plumbing boots around vent pipes, a very common culprit.
- Ice dams in winter, when meltwater backs up under the shingles.
- Worn flat-roof membranes on duplexes and triplexes, especially at seams and drains.
- Clogged gutters or drains that let water pool where it shouldn’t.
Typical leak repairs and what affects the price
Every roof is different, so treat this as a general guide rather than a price list. All of these often fall within the small-repair range mentioned above, roughly before taxes, depending on size, slope, access and condition.
| Repair | What pushes the price up |
|---|---|
| Replacing a few shingles | Steep slope, matching discontinued shingles, damaged decking underneath |
| Plumbing vent boot | Multiple vents, hard-to-reach locations |
| Chimney or skylight flashing | Masonry repairs, custom metal work, old skylight that should be replaced |
| Flat-roof membrane patch | Larger area, wet insulation underneath, aging membrane |
| Ice dam damage | Winter conditions, snow removal needed first, interior damage |
Hidden damage can change the estimate
Sometimes a roofer opens up the area and finds soft, rotted decking or soaked insulation. That’s extra work. A good contractor will explain in the quote how they handle surprises, for example a price per sheet of plywood replaced, so you’re not caught off guard.
When a repair isn’t worth it anymore
If your shingles are curling, losing granules and leaking in more than one spot, patching may be throwing money at a roof that’s done. At some point, replacement is the smarter investment.
For reference, asphalt shingle replacement on a typical house in Quebec often runs around $6 to $12 per square foot installed, and many homeowners pay roughly $8,000 to $20,000 before taxes. Steel roofing often costs around $13 to $30 per square foot, roughly double shingles upfront, but it lasts much longer. Again, it all varies with size, slope, access and condition.
Say you own a bungalow in Laval with 22-year-old 3-tab shingles and a leak by the chimney. Fixing the flashing might stop the drip, but those shingles are near the end of their typical lifespan. Ask your roofer for both options in writing so you can weigh them.
Will insurance pay for the leak?
It depends on why the roof leaked. Home insurance in Quebec usually covers sudden and accidental damage, like a storm tearing off shingles or a tree falling on the roof. It usually does not cover wear and tear or problems caused by lack of maintenance. Your deductible applies either way.
Call your insurer before major repairs if you think the damage is sudden. Take photos from the ground and inside the house, and keep receipts for any emergency tarp work. If you have a dispute with your insurer, the Autorité des marchés financiers (AMF) regulates insurers in Quebec.
How to keep the cost under control
- Act fast. A small leak left alone soaks insulation and rots wood, and the bill grows.
- Don’t go up there yourself. Never climb on a wet, icy, snowy or steep roof. A fall costs far more than any repair.
- Get several written quotes. Comparing quotes from several licensed contractors is the best protection against overpaying or getting the wrong fix.
- Check the RBQ licence. Every roofer should hold a Régie du bâtiment du Québec licence with the right subclass.
- Book outside emergencies when you can. Planned repairs in good weather are usually cheaper than urgent winter calls.
What a good leak repair quote includes
When you compare prices, make sure each roofer is quoting the same thing. A proper written quote should describe where the leak is coming from, exactly what will be repaired or replaced, the materials used, how hidden damage like soft decking will be handled and priced, and whether cleanup is included. It should also show the contractor’s RBQ licence number, the warranty on workmanship and whether taxes are included.
Say you own a triplex in Saint-Laurent and two roofers quote very different prices for the same leak. Often, one has included replacing the flashing along the whole parapet while the other only plans to reseal one corner. Neither is automatically wrong, but you need to know which fix you’re paying for and how long it’s expected to hold.
Bottom line
Most roof leaks can be fixed for roughly a few hundred dollars up to about $2,000 before taxes, but the real cost depends on the cause, the access and the condition of your roof. Emergency and winter work costs more, and an old roof may call for replacement instead. Permit rules vary by municipality and borough, and insurance coverage varies by insurer. Get written, detailed quotes from licensed roofers, compare them carefully, and fix leaks early before they get expensive.
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Request my quotes →Frequently asked questions
Can I just put a tarp on a leaking roof?
A tarp can be a temporary fix to limit damage until a roofer arrives, but it isn't a repair. Have a professional install it if the roof is wet, icy or steep.
Why is winter roof repair more expensive?
Cold, snow and ice make the work slower and riskier, and some materials don't seal well in the cold. Roofers often charge more for winter and emergency calls.
Do I need a permit to fix a roof leak?
Small repairs often don't need one, but permit rules are set by each municipality or borough. Check with your city or ask your roofer before work starts.
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Estimations.pro is a referral service and does not perform the work. Prices are indicative only and vary with the size, slope, access and condition of your roof. Requirements (RBQ licence, municipal permits, programs) can change: check with the relevant organizations and get detailed written quotes.