“How much is this going to cost?” is the first question almost every homeowner asks us, and it’s the one most window companies are cagiest about. This guide lays out what Ontario homeowners are actually paying for replacement windows in 2026, what drives the price up or down, and how to tell a fair quote from a padded one.
The figures below combine published 2026 Ontario pricing guides with what we see on real quotes across London, Mississauga, Oakville, and the rest of the GTA. Every home is different, so treat these as realistic ranges rather than a price list. If you want a number for your own house, a free in-home quote is still the only way to get one that’s accurate.
The Quick Answer
In 2026, a standard-size vinyl replacement window installed in Ontario typically costs $500 to $1,200. Larger units, premium materials, triple-pane glass, and full-frame installation push individual windows to $1,500 to $2,500 or more. Bay and bow windows are their own category and commonly run $2,500 to $6,000+ installed.
For a typical 12 to 16 window home, most homeowners spend $8,000 to $20,000 to replace everything. Published 2026 guides put the average installed price per window somewhere between $550 and $900, depending on which region and product mix they sample.
Cost by Window Style
Style is the biggest single factor after size. Windows with moving parts, cranks, and multi-point locks cost more to manufacture than fixed glass. Here are typical installed ranges for a standard-size, double-pane vinyl window in Ontario:
| Window style | Typical installed cost (vinyl) | Notes |
|---|---|---|
| Picture / fixed | $400–$900 | No moving parts. Cheapest per square foot of glass; large sizes climb quickly. |
| Slider | $450–$900 | Budget-friendly and common in bedrooms and basements. |
| Single / double-hung | $500–$1,000 | Classic look. Double-hung with tilt-in sashes costs more than single-hung. |
| Awning | $500–$1,000 | Great for ventilation in rain. Often paired below a picture window. |
| Casement | $600–$1,200 | Crank hardware and a compression seal make it the most airtight operable style. |
| Bay / bow | $2,500–$6,000+ | Three to five units plus a seat board, roof, and structural support. |
Custom shapes such as arches, circles, and trapezoids are quoted individually and usually carry a 30 to 50 percent premium over a rectangular window of the same area.
Cost by Frame Material
Vinyl is the baseline in Ontario because it offers the best mix of insulation, price, and zero maintenance. Other materials are usually quoted as a premium over an equivalent vinyl unit:
Vinyl
Baseline price. Expect 20 to 35 years of service from a quality multi-chamber frame with welded corners. Best value for most homes.
Fiberglass
Roughly 20 to 40 percent more than vinyl. Stiffer, paintable, and expands at nearly the same rate as glass, so seals stay tighter over decades. 30 to 50 year lifespan.
Aluminum (thermally broken)
Roughly 10 to 20 percent more than vinyl. Slim frames and big glass, but only worth it in Ontario with a proper thermal break.
Wood / wood-clad
Roughly 40 to 100 percent more than vinyl. The right answer for heritage districts and high-end custom homes, with ongoing maintenance.
Glass Packages: Double, Triple, and Low-E
The glass is where a lot of the performance lives, and where quotes quietly diverge. Two windows that look identical can differ by several hundred dollars because of what’s between the panes.
- Double-pane with Low-E and argon is the standard package in 2026 and is what most ENERGY STAR® certified vinyl windows ship with. Anything without Low-E and argon is a builder-grade product and should be priced accordingly.
- Triple-pane typically adds 10 to 20 percent to the window price. Several Ontario manufacturers now treat it as their default rather than an upgrade, so the premium keeps shrinking. It pays off most on north-facing walls, bedrooms, and homes near busy roads.
- ENERGY STAR Most Efficient windows (Energy Rating of 40 or higher, or a U-factor of 1.05 W/m²·K or lower per Natural Resources Canada) almost always require triple glazing and a warm-edge spacer.
- Tempered or laminated glass is required by code near doors, in bathrooms, and low to the floor, and adds cost per pane. A good quote calls this out rather than surprising you later.
Retrofit vs. Full-Frame Installation
How the window goes in matters as much as what it is. A retrofit (insert) installation leaves your existing frame in the wall and fits the new unit inside it. A full-frame (brick-to-brick) installation removes everything back to the rough opening and starts fresh with new flashing, insulation, and exterior trim.
Full-frame work takes longer and uses more materials, so in our experience it commonly adds $200 to $500 per opening once new brickmould, jamb extensions, and interior casing are included. It’s the right choice when the old frames show any rot or water damage, when you want more glass area, or when a previous retrofit has already shrunk the opening. We cover this decision in detail in our retrofit vs. full-frame guide.
Whole-House Projects
Per-window prices drop as the project grows because setup, travel, and disposal get spread across more openings. Here’s what complete replacements typically land at in Ontario in 2026:
| Home | Window count | Typical installed range |
|---|---|---|
| Bungalow or semi | 8–12 | $6,000–$14,000 |
| Two-storey family home | 12–18 | $9,000–$22,000 |
| Larger detached home | 20–25 | $15,000–$30,000+ |
The low end assumes standard-size vinyl sliders and hung windows with a retrofit install. The high end assumes casements, some triple-pane glass, a bay or bow, and full-frame installation. A typical 12 to 15 window project takes our crew one to two days on site.
What’s Often Missing From a Quote
Two quotes that look $3,000 apart are sometimes the same price once you add back what one of them left out. Check every quote for these line items:
- HST. Ontario’s 13 percent HST applies to the full installed price. Some quotes show it, some don’t. Always compare totals with tax included.
- Interior and exterior finishing. New casing, jamb extensions, brickmould, aluminum capping, and caulking. Full-frame installs need all of it.
- Disposal. Old windows, glass, and debris. Should be included, and should be stated.
- Permits. Like-for-like replacement generally doesn’t need a building permit, but enlarging an opening, adding an egress window, or working in a heritage district does.
- Screens and hardware. Screens on operable windows, locks, and crank hardware should be standard, not an add-on.
- Warranty terms. Look for the manufacturer’s warranty on the unit and the sealed glass, plus a separate written labour warranty from the installer.
How to Bring the Price Down
A few decisions make a bigger difference than haggling ever will:
- Do the whole house at once, or at least a full elevation. Per-window cost falls and you get one consistent look.
- Mix styles strategically. Casements where you need airtightness and ventilation, fixed or slider units where you don’t. A picture window flanked by two awnings often costs less than three casements.
- Claim the rebate. Ontario’s Home Renovation Savings Program currently pays $100 per rough opening for ENERGY STAR certified windows and doors installed as part of a bundled retrofit. Our 2026 rebate guide walks through the rules.
- Book in the off-season. Late fall and winter installs are routine for experienced crews, and schedules are easier to get.
- Skip the showroom markup. Companies that pay sales commission build it into the price. We don’t pay commission, and our quotes reflect that.
Reading a Quote: Red Flags
After more than 20 years of quoting windows, these are the patterns that should make you pause:
- A “today only” price. Legitimate pricing doesn’t expire when the salesperson leaves your driveway.
- A lump sum with no per-window breakdown. You can’t compare it to anything, and that’s the point.
- No mention of the Energy Rating or ENERGY STAR certification. If they can’t tell you the ER number, they may be quoting a builder-grade unit.
- No installation method specified. Retrofit and full-frame are different jobs at different prices. The quote should say which one you’re getting.
- A price far below every other quote. Either something is missing or the installer is cutting corners on flashing and insulation, which is where windows actually fail.
Want a Real Number for Your Home?
We measure, explain the options, and give you a written, itemized quote with no commission and no pressure. Serving London, Mississauga, Oakville, and the GTA.
A family-owned business that supplies and installs high-quality windows and doors throughout Mississauga, Oakville, London, and surrounding areas in Ontario. Over 20 years of experience and a reputation built entirely on customer referrals.