When a storefront door panel breaks, the first question every business owner asks is how fast it can be replaced. The better first question is what kind of glass was in there — because the answer changes the lead time, the cost, and in some cases whether the replacement is even legal for that opening.
Most owners have never had to think about this until the day they are standing in front of an empty aluminum frame. Here is the short course.
The three glass types you will actually encounter
Tempered glass
Tempered glass is heat-treated so that its surface is under compression. That makes it roughly four times stronger than ordinary annealed glass of the same thickness, and — the part that matters for safety codes — when it does break it shatters into small blunt pieces rather than long shards.
This is the default for most single-pane storefront doors and sidelites in Ontario. It is the reason a broken storefront door leaves a pile of gravel-like fragments rather than knife-edged sheets.
The critical operational fact: tempered glass cannot be cut, drilled or edged after tempering. Every hole for a pull handle, patch fitting, lock or pivot has to be fabricated before the panel goes into the oven. That is why a tempered replacement is made to order and why a same-day swap is often not physically possible — the panel has to be fabricated, not pulled off a shelf.
Laminated glass
Laminated glass is two or more layers bonded to an interlayer, usually PVB. When it breaks, the fragments stay stuck to the interlayer. The pane cracks but the opening stays closed.
This is the security choice. A laminated panel does not stop a determined attack indefinitely, but it dramatically slows a smash-and-grab, because breaking the glass does not create an opening — the intruder has to work through a tough plastic membrane while making noise. For businesses that have been hit once, upgrading the vulnerable panels to laminated is usually a better spend than an alarm upgrade.
It is also the quieter option, which matters for street-facing retail and restaurants, and it blocks nearly all UV, which matters if you have merchandise or artwork in the window.
Insulated glass units (IGUs)
An IGU is two panes separated by a sealed spacer with dry air or argon between them. This is about thermal performance, not strength. If your storefront entrance is heated space and you are paying to condition it, IGUs in the door and the adjacent glazing pay for themselves over a few winters.
IGUs fail in a specific and recognisable way: the perimeter seal goes, moisture gets into the cavity, and you get permanent fogging or visible condensation between the panes that no cleaning will touch. A fogged unit is not repairable — the unit gets replaced, though the frame does not.
How they get combined
These categories are not exclusive. Most commercial entrances in the GTA end up with some combination:
- Tempered, single pane — interior doors, vestibule doors, unheated entries.
- Tempered IGU — the common spec for a heated main entrance. Both panes tempered for safety, sealed unit for insulation.
- Laminated outer, tempered inner IGU — the security-plus-efficiency spec for street-level retail, pharmacies, jewellery, anything with high-value inventory in view.
- Laminated single pane — retrofits into existing single-glazed frames where the goal is purely resistance to break-ins.
What determines your lead time
Owners are often frustrated that a “simple pane of glass” takes days. The variables:
- Fabrication. Tempered and laminated panels are made to size with hardware cut-outs already in place. Nothing about that is a stock item.
- Hardware cut-outs. A door panel with a patch fitting top and bottom, a lock prep and a handle prep has four or five fabrication operations. A plain sidelite has none. The door always takes longer than the fixed glass beside it.
- Thickness and tint. Standard clear 6mm or 10mm moves fast. Tinted, low-E coated, or non-standard thickness adds days.
- Frame condition. If the frame was bent in the same incident that broke the glass, the glass cannot go back until the frame is straightened or replaced.
This is why competent shops board up first and glaze second. Boarding secures the premises the same day; the correct panel arrives when it arrives. If someone promises a same-day tempered door panel with hardware preps, ask what they are actually installing — commercial glass door work done in a hurry with the wrong panel tends to get redone.
Spec decisions worth making before you need them
The best time to decide on glass is not at 2am with a broken storefront. A few decisions worth making in advance:
Know what is currently in your openings
Tempered glass carries a permanent etched stamp, usually in a corner, naming the manufacturer and the standard it meets. Walk your frontage once and note which panels have it. Panels without a stamp in a door or a low sidelite may be annealed glass that predates current requirements — those are the ones that produce serious injuries when they break, and they are worth replacing proactively.
Decide where laminated is worth it
You rarely need laminated everywhere. Prioritise the panels an intruder would actually target: the door leaf beside the lock, any panel at ground level next to the door, and any glazing that gives direct line of sight to a till or display case. A partial upgrade captures most of the benefit.
Keep your frame dimensions on file
Photograph each opening, record the panel sizes, the thickness, and the hardware layout, and keep it with your insurance documents. It cuts a day or more off the response after a break-in, because the fabricator can start without a site measure. Businesses that have this ready get their storefront door glass back in service noticeably faster than businesses that do not.
After a break-in: the order of operations
The sequence that keeps the business running and the insurance claim clean:
- Police report and photographs before anything is cleared.
- Secure the opening — board-up or temporary panel.
- Assess the frame and hardware. Glass rarely breaks alone; the lock, the closer and the frame usually take damage in the same event.
- Order the correct panel, upgrading the spec if the incident showed a weakness.
- Glaze and re-test the door — closing speed, latch engagement, lock throw.
Skipping step three is the most common mistake. A new panel in a bent frame will crack again, usually within weeks, from the stress the frame puts on it. If the frame is compromised, emergency door repair on the frame and hardware has to happen before the glass goes in.
Frequently asked questions
Can tempered glass be cut down to fit?
No. Any attempt to cut or drill tempered glass shatters the whole panel. Every dimension and every hole has to be right before tempering.
Is laminated glass bulletproof?
No. Standard laminated glass is a delay measure — it resists penetration and holds the opening closed. Ballistic-rated glazing is a different, much thicker and much more expensive product.
My storefront glass is fogged between the panes. Can it be cleaned?
No. Fogging means the sealed unit has failed and moisture is inside the cavity. The IGU is replaced; the frame stays.
Do I need tempered glass by law?
Safety glazing is required in specific hazardous locations, which includes doors and glazing adjacent to doors. If your existing panel is not stamped, treat it as a compliance question worth checking rather than assuming it is grandfathered.
Should I upgrade the whole frontage to laminated after one break-in?
Usually not. Upgrade the panels that were actually vulnerable — the door leaf and the ground-level glazing next to it. Full-frontage laminated is a large expense for protection you mostly do not need at height.
Bottom line
Tempered protects people. Laminated protects inventory. Insulated protects your heating bill. Most Toronto storefronts need a deliberate mix of all three rather than whatever the previous owner installed. Knowing which panels you have — and having the sizes on file — is the difference between being back in business tomorrow and being boarded up for a week.