Window replacement in Ontario
Windows are the easiest place to lose heat and the easiest to over-buy. Here is what replacement really costs in Ontario, which frames and glazing are worth it, and how to get paid back for it.
Quick answer
Window replacement in Ontario typically costs $900 to $2,200 per window installed. Vinyl double-glazed units sit at the low end, fibreglass and triple-glazed at the top, and wood or custom shapes above that. A typical 15-window house lands between $15,000 and $30,000. ENERGY STAR windows qualify for $100 back per rough opening when bundled with another upgrade.
$900 to $2.2k
Per window installed
$15k to $30k
Typical whole house
$100
Rebate per opening
3 to 5 days
Typical install
How much does window replacement cost per window?
Windows are priced per opening, not per square foot, so a house full of small windows can cost as much as a house with a few large ones. The number that matters is the installed price, which includes removing the old unit, the new window, capping, insulating the gap, and finishing inside and out.
| Window type | Typical cost each |
|---|---|
| Vinyl, double-glazed, standard size | $900 to $1,400 |
| Vinyl, triple-glazed | $1,200 to $1,800 |
| Fibreglass, triple-glazed | $1,600 to $2,400 |
| Wood or wood-clad | $2,000 to $3,500 |
| Bay, bow, or custom shape | $2,500 to $6,000+ |
Two things push a quote up more than anything else: custom sizes, because older Ontario homes are rarely square, and structural changes, because widening an opening means a new header and turns a window job into carpentry. If a quote looks unusually cheap, check whether it includes interior finishing, or whether you are left with bare drywall to patch yourself.
Frame materials, and which are worth it
Frame choice drives both price and lifespan.
- Vinyl is the default in Ontario for good reason: it insulates well, never needs painting, and is the cheapest to buy. It expands and contracts more than other materials, so very large vinyl units can be a weak point.
- Fibreglass moves almost the same amount as the glass it holds, which means better long-term seals. It costs more and is worth it on large or west-facing openings.
- Wood and wood-clad look right on century homes and heritage streets, and cost accordingly. They need maintenance on the exterior unless they are aluminum-clad.
- Aluminum conducts heat and is rarely the right call for a house in this climate, though it still appears in commercial work.
The install matters more than the brand. A mid-range window fitted properly, with the
gap insulated and the exterior flashed and sealed, will outperform a premium window installed badly. Most
window failures we are called to fix are installation failures, not product failures.
Double vs triple glazing
Triple glazing adds roughly 20 to 35 percent to the price of a window. Whether it pays back depends on where the window faces and what you want from it:
- Worth it on north and west elevations, on bedrooms facing a busy road, and in any room you have avoided sitting in during January because it feels cold near the glass.
- Marginal on small windows, on sheltered south elevations where you want solar gain, and on a house you plan to sell within a couple of years.
The comfort difference is easier to feel than the bill is to measure. Triple glazing raises the interior surface temperature of the glass, which removes the cold draught sensation near a window even when there is no actual draught. That is usually what people are buying.
What you can claim back
Under the provincial Home Renovation Savings Program, ENERGY STAR certified windows and doors earn $100 back per rough opening. This one sits in the bundle stream, which means it requires a home energy assessment and at least two upgrades, so it pairs naturally with insulation or air sealing. The assessment itself is rebated at $600.
On a 15-window house that is $1,500 back, which will not decide the project on its own, but it is close to free money if you are already replacing windows. If you are combining work, read our guide to paying for a renovation, and our insulation guide for the other half of the bundle.
Warmer rooms, lower bills
We replace windows, seal the envelope, and handle the rebate paperwork. Get a quote, anywhere in Ontario.
Talk to ZeybekWhen do windows actually need replacing?
Not every tired window needs to go. Replace when you see:
- Condensation or fog between the panes, which means the seal has failed and the unit cannot be repaired
- Frames that are rotten, soft, or no longer holding square
- Draughts you can feel with the window closed and locked
- Sashes that will not stay up, or that have been painted shut for years
Single-pane glass with a decent storm window, in a frame that is still sound, is often worth keeping on a century home where the originals are part of the character. Restoration is a real option, and sometimes the cheaper one.
Frequently asked questions
How much does one window cost to replace in Ontario?
Expect $900 to $1,400 for a standard vinyl double-glazed window installed, and $1,600 to $2,400 for fibreglass with triple glazing. Custom shapes and bay windows run higher.
Is triple glazing worth it in Ontario?
On north and west elevations, on bedrooms facing traffic, and in rooms that feel cold near the glass, yes. On small or sheltered south-facing windows the payback is slower and double glazing is usually enough.
Is there a window rebate in Ontario?
Yes. The Home Renovation Savings Program pays $100 per rough opening for ENERGY STAR certified windows and doors. It sits in the bundle stream, so it requires a home energy assessment and at least two upgrades.
Do I need a permit to replace windows?
Not for a like-for-like replacement in the same opening. You do need one if the opening is being made larger or smaller, because that is structural work involving a new header.
How long does a window replacement take?
A whole house is usually three to five days. Individual windows take about an hour each once the crew is set up, and the openings are closed the same day they are opened.
Zeybek Construction
General contractors, Ontario
Written by the Zeybek team from more than two decades of renovation and construction work across Ontario, from Toronto and the GTA to Kitchener, Waterloo, and beyond. We build kitchens, bathrooms, whole homes, additions, and commercial spaces, and we handle permits and inspections as part of the job.
Related guides
Last updated July 16, 2026. This guide is general information for Ontario homeowners and is not a substitute for a site-specific quote or municipal advice. Costs, rebate programs, and rules vary by municipality and change over time.
Warmer rooms, lower bills
We replace windows, seal the envelope, and handle the rebate paperwork. Get a quote, anywhere in Ontario.