What Is Window Glass Replacement?
Window glass replacement is swapping out the sealed insulated glass unit inside a window while keeping the frame and sash. Almost every window installed in the GTA since the 1980s uses a sealed unit: two or three lites of glass separated by a spacer, sealed around the edge, and filled with Argon gas. When that unit cracks, fogs or loses its seal, the whole unit is replaced as one piece.
The new unit is built to the exact size and thickness of the old one by a fabricator, so it drops into the same pocket in your sash. The crew removes the glazing beads, cuts the old unit free, cleans the pocket, sets the new unit on setting blocks and refits the beads. From outside, the window looks the same. Inside, it performs like new.
What Goes Into a Good Replacement Unit
Not all sealed units are equal. The ones we install share five features:
- Low-E coating. A microscopically thin metal coating that reflects heat back into the room in winter. Guardian ClimaGuard IS-20 and Pilkington OptiTherm are our standards for Toronto homes.
- Argon fill. A dense, inert gas between the panes that slows heat transfer better than air.
- Warm-edge spacer. A low-conductivity spacer that keeps the edge of the glass warmer, which cuts condensation and frost along the bottom of the window.
- Dual seal. A primary polyisobutylene seal and a secondary silicone seal, which is what makes a unit last 20 years instead of 8.
- Certified fabrication. Built by a certified shop, with a stamp on the spacer and a manufacturer warranty behind it.
When Should You Replace Window Glass?
Replace the sealed unit when you see any of these:
- Fog, haze or water droplets between the panes. The seal has failed and the gas is gone.
- A crack in either lite. The unit is no longer sealed.
- Frost or ice on the inside surface in winter. Often a sign of a failing unit or a very old clear unit with no Low-E.
- Rooms that are noticeably colder near the window. Old units lose most of their insulating value once the gas leaks out.
- The condo board has asked for replacement to match the original spec.
Glass-Only Replacement vs a New Window
| Glass-only replacement | Full window replacement | |
|---|---|---|
| Typical cost per opening | $320-$1,250 | $3,800-$4,500 |
| Frame, trim and drywall | Untouched | Removed and refinished |
| Lead time | 7-14 business days | 4-8 weeks |
| Install time | 30-90 minutes | Half day or more |
| Energy performance | New Low-E Argon unit | New unit plus new frame |
| Best when | Frame is sound | Frame is rotten or failing |
For a window that is 10-20 years old with a sound vinyl or aluminium frame, glass-only replacement gets you most of the comfort of a new window at a fraction of the cost.
Choosing the Right Coating for Each Room
Not every window in a house needs the same glass. North-facing rooms benefit from a high-solar-gain Low-E that lets winter sun in. South and west-facing rooms that overheat in July benefit from a solar control coating like Vitro Solarban 70XL. Bathrooms may want obscure glass for privacy, and any lite near a door, floor or tub needs CSA A440 tempered glass.
Our Toronto glass repair crew walks the house with you, notes which way each window faces, and recommends a spec for each one. You get a quote that lists every unit separately, so you can do the worst windows now and the rest later. Request a written quote and include photos of the windows if you have them.
Written by The Elite Glass Repair Toronto Crew. Last updated .
