Roofing options and costs in London
London has a large stock of homes that were built before 1981, and with 58.1% of households owning their home in the city, many owners are now planning reroofs rather than waiting for emergency leaks. The local housing mix also matters: single-detached houses make up 48.8% of dwellings, so there is a steady volume of full tear-offs, re-decking, and chimney flashing work that keeps roofers busy across the city. In practical terms, older shingles, tired vents, and original attic detailing are common on streets in Old East Village, Westmount, and other mature areas, which is why London quotes often reflect more than just shingle price. This cold, continental climate brings snow load, freeze-thaw cycles, and ice-dam risk, so quality contractors build in better eave protection, balanced ventilation, and careful flashing rather than quoting a bare-bones install. That adds material and labour cost, but it also reduces callbacks and winter leak problems. London’s install season is shorter than in milder regions, and contractors often price peak-summer work higher because crews must juggle weather delays, training, safety compliance, and disposal logistics. Material costs have also risen across Southwestern Ontario, so a straightforward asphalt job may land near the lower end of the local range, while a steep, two-layer tear-off with deck repairs can move quickly toward the upper end. The comparison below shows how the main systems stack up for London homeowners.
| Type |
Typical Use |
Lifespan |
Best For |
Price Range |
| Full asphalt shingle replacement (tear-off + new install) |
Most common detached homes and older bungalows |
18–25 years |
Cost-conscious owners needing a full reset |
$7,500 – $16,000 |
| Architectural / laminated shingle (premium asphalt) |
Upgraded replacement for family homes and resale-focused properties |
22–30 years |
Better curb appeal and improved wind performance |
$9,500 – $18,500 |
| Impact-resistant shingle (Class 4 — hail & wind zones) |
Homes seeking stronger impact resistance and insurance-friendly upgrades |
25–35 years |
Extra durability where storms and branches are a concern |
$11,000 – $21,000 |
| Metal roofing (steel panels or standing seam) |
Long-life residential roofs, cottages, and premium renovations |
40–60+ years |
Low maintenance and strong snow-shedding performance |
$18,000 – $38,000 |
| Flat / low-slope membrane (TPO or EPDM) |
Porches, additions, garages, and low-slope sections |
15–25 years |
Flat or near-flat roof areas that need watertight detailing |
$12,000 – $30,000 |
| Roof repair + flashing only (no full replacement) |
Localized leaks, chimney work, vent boots, valley and wall flashing |
2–10 years depending on scope |
Small failures where the roof deck and shingles are still serviceable |
$350 – $3,500 |
Prices are estimates only and vary by project scope, site access and material selection.
What affects the price of roofing in London
Two roofing quotes for the same house in London can easily differ by 30–50% because the final price is driven by more than square footage. One contractor may be quoting a simple single-layer tear-off on a low-pitch roof with easy driveway access, while another is pricing a steep, two-layer roof with chimney flashing, rotten sheathing, and full ice-and-water coverage. In London and the broader Ontario market, roofs must be built for snow load and freeze-thaw cycles, which raises the baseline for underlayment, eave protection, and ventilation; those climate-driven details can add several hundred dollars even on a modest bungalow. Alberta’s hail belt pushes demand for impact-rated shingles, while coastal BC’s rain and wind favour metal and premium synthetic underlayments; those regional differences matter because local supply chains and contractor habits affect what gets quoted. In London, shorter install seasons also concentrate demand into spring and summer, so labour rates can rise when crews are booked out. A typical asphalt job that starts around $7,500 – $16,000 may climb toward the top end if two layers must be removed, and a membrane roof on a flat addition can move from a basic $12,000 – $30,000 estimate to the upper half when drainage, parapets, or skylights complicate the work. On many pre-1981 homes, hidden deck repairs can add $600 to $2,500 quickly, especially once old shingles come off and the plywood is exposed. Better quotes in London are the ones that explain those variables clearly, not the ones that simply promise the lowest number.
| Price Factor |
Why It Matters |
Cost Impact |
| Roof pitch and steepness |
Affects safety equipment, harnessing, staging and install speed |
Steeper roofs usually add $500–$2,000 |
| Number of shingle layers to tear off |
2 layers = extra labour, disposal and more deck inspection time |
Commonly adds $1,000–$3,500 |
| Total roof area in squares (1 square = 100 sq ft) |
More material, more labour, more waste removal |
Bigger roofs can add $2,000–$8,000+ |
| Decking condition |
Rotted OSB or plywood must be replaced before new roofing goes on |
Often adds $75–$150 per sheet installed |
| Chimney, skylight and vent flashing complexity |
More penetrations mean more labour and leak risk |
Can add $250–$1,500+ |
| Ice-and-water shield coverage required |
Climate-driven protection at eaves, valleys and penetrations |
Usually adds $250–$1,200 |
| Regional labour rates and length of the install season |
Shorter seasons and high demand raise pricing in peak months |
Can shift totals by 10–20% |
| Material quality tier |
Standard, impact-rated and premium systems have different costs and warranties |
May change the quote by $1,500–$15,000 |
Permits & regulations in Ontario
In Ontario, most like-for-like re-roofing jobs do not require a building permit, so replacing worn asphalt shingles with a new asphalt system on the same roof shape is usually straightforward. Where a permit often becomes necessary is when the work changes the structure or use of the roof: adding a second layer where the code does not allow it, repairing or replacing rafters or roof framing, converting a pitched roof to a flat roof, changing the roofline, or doing major structural deck repairs. If a contractor tells you “no permit needed” for a project that clearly changes structure, that is a warning sign. For a typical London homeowner, the safest approach is to ask the contractor which parts of the job are being treated as maintenance versus structural work. You should also verify liability insurance, WSIB coverage, and manufacturer certification before signing. Start by asking for the contractor’s legal business name and checking the Ontario business registration or corporate profile online, then ask for a current certificate of insurance showing coverage limits and dates, and finally request a WSIB clearance letter or equivalent proof of workplace coverage. For warranty-backed installs, confirm the crew is certified by the shingle or metal manufacturer, especially if the roof is part of a premium system. If one document is missing, or if the company refuses to provide it, move on. In London, that diligence matters because older housing stock and weather-related repairs can expose hidden issues once the tear-off starts.
Choosing the right roofing material for London's climate
London’s freeze-thaw cycles, snow load, and wind exposure make roof selection a durability decision as much as a budget decision. For many homes, architectural shingles are the sweet spot: they cost more than basic 3-tab shingles, but they usually handle Ontario winters better and offer stronger curb appeal and resale value. On a typical detached home, that upgrade might mean choosing a roof near $9,500 – $18,500 instead of the lower-cost basic asphalt range, and for most homeowners that extra spend is justified by a longer service life and better wind resistance. Impact-resistant shingles are worth considering if your property sees repeated branch fall, exposure on open streets, or you want to maximise durability; the 20–30% premium can make sense when the alternative is another tear-off a few years earlier. Metal roofing becomes attractive when the homeowner plans to stay long term, wants low maintenance, and values snow-shedding performance, but the upfront cost is much higher and the payback depends on how long you own the house. For flat additions and low-slope sections, TPO or EPDM is usually the right call because shingles simply do not perform as well there. Ontario homeowners may also see better insurer interest in impact-rated or high-wind-rated systems, and some carriers offer premium reductions, though the amount varies by policy. In London, the best choice is usually the one that balances winter performance, warranty, and lifecycle cost rather than the cheapest quote on paper.
| Material |
Lifespan |
Snow & Ice Performance |
Wind / Hail |
Maintenance |
Price Band |
| Asphalt 3-tab (entry-level) |
15–20 years |
Basic performance; more vulnerable to ice-dam damage if ventilation is poor |
Moderate wind resistance; lowest hail tolerance |
Higher; tabs age faster and may curl earlier |
$7,500 – $12,000 |
| Asphalt architectural / laminated (standard) |
22–30 years |
Good winter performance with proper eave protection and attic ventilation |
Better wind resistance than 3-tab; moderate hail performance |
Moderate; periodic inspections recommended |
$9,500 – $18,500 |
| Impact-resistant shingle (Class 4) |
25–35 years |
Strong winter durability when paired with quality underlayment |
Best asphalt option for hail and wind resistance |
Moderate to low; fewer storm-related repairs |
$11,000 – $21,000 |
| Metal — steel panels (exposed fastener) |
30–45 years |
Excellent snow shedding; good for freeze-thaw and drifting |
Good wind performance; hail can dent finish |
Low to moderate; fastener checks over time |
$18,000 – $30,000 |
| Metal — standing seam (concealed fastener) |
40–60+ years |
Excellent snow and ice performance with very strong drainage detailing |
Excellent wind resistance; strong long-term durability |
Low; premium system with fewer exposed fasteners |
$24,000 – $38,000 |
| Flat TPO / EPDM membrane (low-slope only) |
15–25 years |
Good when drainage and edge detailing are correct; critical for ice control |
Good wind performance when mechanically fastened or fully adhered |
Moderate; seams and penetrations need inspection |
$12,000 – $30,000 |
How to choose a roofing contractor in London
Start with proof, not promises. Ask each London contractor for their Ontario business name and verify it through an online business registry or corporate search, then request a certificate of liability insurance that shows the policy is active and the limits are high enough for roof work. Next, ask for WSIB coverage and get a clearance letter if the company has workers on payroll; if they use subcontractors, confirm who is responsible for coverage. Good quotes should be itemised and written, with labour, materials, tear-off, disposal, ventilation, flashing, and deck repair listed separately so you can compare apples to apples. A lump sum quote is not enough if one roofer includes permit pulling, ice-and-water shield, and two sheets of plywood while another excludes them. Ask about the workmanship warranty in writing, the manufacturer warranty on products, and whether either warranty is transferable if you sell the house. Payment terms should protect you: never pay more than 10–15% upfront, and hold back the balance until the job is complete and you have inspected the site. Finally, insist on a start date and an estimated completion window in writing, because weather delays are normal in Ontario but they should still communicate clearly. In London, the best contractors are the ones who can explain the roof, the code, and the price without pressure.
- Verify the contractor’s legal business name before signing.
- Ask for a current certificate of liability insurance.
- Request a WSIB clearance letter or equivalent coverage proof.
- Get 2–3 itemised written quotes.
- Confirm labour, materials and disposal are broken out.
- Ask whether permit pulling is included if the job needs one.
- Check how many shingle layers will be removed.
- Confirm ice-and-water shield coverage by area and location.
- Ask what decking repairs cost per sheet or per hour.
- Get workmanship and product warranty terms in writing.
- Confirm whether the warranty is transferable.
- Make sure the payment schedule is tied to progress and final completion.
Red flags in London include a contractor who demands most of the money upfront, refuses to itemise the quote, avoids showing insurance or WSIB documents, says every roof “doesn’t need” ice and water shield, or pressures you to sign the same day because “materials are going up tomorrow.”
Frequently asked questions — roofing in London
What roofing warranty should I expect?
In London, a good roofing warranty usually has two parts: the manufacturer warranty on shingles or metal panels, and a separate workmanship warranty from the installer. For a standard asphalt roof, you might see a product warranty in the 25- to 50-year range, but that does not mean the entire roof is covered for that long. Workmanship coverage is often shorter, and for a reputable Ontario contractor it is reasonable to expect several years of labour warranty in writing. If you are paying near $9,500 – $18,500 for an architectural shingle roof, ask whether the warranty is transferable if you sell the house, and whether ventilation, underlayment, and flashing are all included. In older London homes, warranty claims are often tied to attic moisture, ice dams, or poor flashing rather than the shingles themselves, so the fine print matters.
Is metal roofing worth the extra cost in London?
Sometimes, yes. In London and across Ontario, metal roofing makes the most sense when you plan to stay in the home long term, want lower maintenance, or have a roof shape that sheds snow well. The upfront price is much higher, often $18,000 – $38,000, so the value depends on lifespan, not just the first invoice. A standing-seam roof can outlast several asphalt cycles, which is attractive on older houses built before 1981 where the next owner may value a “forever roof.” If you are selling soon, a premium asphalt roof may give a better return. If your home has repeated ice-dam issues, heavy snow sliding, or wind exposure, metal can be a strong choice when installed correctly.
What time of year is best to replace a roof in London?
Late spring through early fall is usually the best window for roofing in London because crews can work more efficiently and sealants cure properly. Ontario weather still changes fast, so good contractors book around rain and heat, but the middle of the season generally offers the best combination of scheduling and install quality. Winter work is possible, but it can be slower and more expensive because of shorter daylight, snow, icy surfaces, and extra safety precautions. If your roof is close to failure, don’t wait just because the calendar is wrong; emergency repairs can still cost $350 – $3,500, and water damage often becomes more expensive than the roof itself. For planned replacement, book early so you are not forced into peak-season pricing or rushed decisions.
How do I compare roofing quotes fairly?
The fairest way to compare quotes in London is to line them up item by item, not just by total price. Make sure each quote shows labour, materials, tear-off, disposal, ice-and-water shield, flashing, ventilation, and any deck repair allowance. One contractor may quote a basic roof near $7,500 – $16,000, while another includes better underlayment and more flashing detail that is worth the extra money. Check whether permit pulling is included if needed, whether there is one or two layers to remove, and whether the warranty terms are identical. A lower price is not a bargain if it excludes ventilation upgrades or charges extra for every sheet of plywood. In Ontario, compare the scope, not just the sticker price.
Should I repair or replace my roof in London?
If the leak is isolated and the roof deck is still sound, a repair may be the smart move. In London, flashing failures around chimneys, vents, and valleys are common on older homes, and those can often be solved for a few hundred to a few thousand dollars. But if the shingles are curling, granules are washed off, there are multiple leaks, or the roof is already near the end of its service life, replacement is usually the better long-term choice. A repair quote of $350 – $3,500 is reasonable for localized work, but once repairs become repetitive, you may be better off investing in a full roof replacement. Homes built before 1981 often reveal hidden deck issues once the shingles are removed, so an on-site inspection is important before deciding.
What is ice and water shield and do I need it in Ontario?
Ice and water shield is a self-adhering waterproof underlayment that helps protect vulnerable areas of the roof from leaks caused by ice dams, wind-driven rain, and meltwater backup. In London and across Ontario, it is especially important at eaves, valleys, around chimneys, skylights, and other penetrations because our freeze-thaw cycles can push water under shingles. On a typical asphalt reroof in Ontario, proper ice-and-water coverage is not optional in good practice even if the roof “looks fine” from the street. It may add a few hundred to over a thousand dollars to the job, but that is cheap insurance compared with interior damage. If a contractor is quoting a new roof near $7,500 – $16,000 and leaves this out entirely, ask why. In a cold climate like London, it is one of the most important details on the roof.
