Entry Door and Sidelight Glass: Replacement, Privacy and Safety Rules
In most steel and fibreglass entry doors, the glass is a framed insert (a 'lite') that can be replaced without replacing the door, and sidelights work the same way. Replacement glass must be safety glass where Ontario's code requires it: door glass over 0.5 m² that reaches within 900 mm of the bottom, and sidelights wider than 500 mm that could be mistaken for a door. Frosted, etched or decorative inserts add privacy while keeping the light.
Door and sidelight glass usually sits in a two-part surround made for 1-3/4 in doors, so the glass can be swapped while the door stays on its hinges.
Replacement glass must match the thickness of the existing lite, typically 1/2 in or 1 in for insulated inserts.
Ontario requires safety glass in entrance-door glass over 0.5 m² extending within 900 mm of the bottom, and in door-like sidelights over 500 mm wide.
Fog inside a door insert means its seal has failed, the same as in a window, and the sealed glass has to be replaced.
Replacing only the glass keeps your door, frame and hardware. For comparison, the new steel entry door with sidelites it avoids runs about $5,000–$9,000 installed in Canada.
On this page
In most steel and fibreglass entry doors, the glass isn't part of the door slab. It's a framed insert, often called a door lite, held in a surround that clamps through the door from both sides. Sidelights are built the same way. So when door glass cracks, fogs or just looks dated, you can usually replace the glass and keep the door.
Two things decide what glass you can put in. First, Ontario's safety-glass rules apply to large, low door glass and to sidelights that could be mistaken for a door. Second, the new insert has to match the thickness and size of the opening in your door. Everything else, from clear to frosted to leaded, is a style choice.
How door and sidelight glass is built
A typical insert has three parts:
- The glass. Plain clear insulated glass, tempered, frosted, etched and leaded designs are all common.
- The surround (frame). It's made of plastic, wood or metal and sized for 1-3/4 in thick steel, wood or fibreglass doors. One half sits on the outside, one on the inside, and screws pull them together through the door.
- The seal. Sealant or gaskets between the surround and the door skin keep water out.
Insulated inserts use glass about 1/2 in or 1 in thick. If you replace only the surround, or only the glass, the new part must match the thickness of what's there now.
Older wood doors are different. Their glass usually sits in a rebate held by wood stops or glazing putty, much like an old window sash, and is replaced pane by pane.
Common problems and fixes
| What you see | Likely cause | Usual fix |
|---|---|---|
| Crack or shattered glass after a slam, a knock or a break-in | Impact or edge stress | New glass made to size (tempered or laminated), in the existing surround |
| Fog or droplets between the panes | Failed edge seal on the insulated insert | New sealed glass unit, or a full new insert if the surround is damaged |
| Draft or water around the insert | Dried-out sealant between surround and door skin, or loose screws | Reseal and re-tighten the surround; check the door's weatherstripping too |
| Yellowed or broken plastic surround | UV and age | New surround matched to the glass thickness |
| Discoloured caming or a dated design | Age, style | New decorative insert in the same size |
| Worried about glass beside the lock | Glass within reach of the thumb-turn | Laminated glass or anchored security film; check the lock |
A few points on the trickier ones.
Fog. An insulated door insert is a sealed glass unit, exactly like a double-pane window. Its seals are never perfectly hermetic, and once the desiccant in the spacer is used up, moisture condenses between the panes. That moisture can't be wiped away from either side and won't clear on its own. See how to tell if a seal is broken.
Drafts. Natural Resources Canada suggests checking around the door, including the threshold and around the door frame, and making sure the seal between the glass and its frame is intact with no cracks or missing sections. Often the leak is the door's weatherstripping rather than the glass; our guide to locks, hinges and weatherstripping covers that side.
Security. In Toronto, property standards require exterior doors to be "capable of being locked or otherwise secured from inside". If a broken insert leaves the door unsecured, treat it as urgent and board the panel (what to do in the first hour).
Ontario safety-glass rules for doors and sidelights
The Ontario Building Code requires safety glass, meaning tempered or laminated glass to CAN/CGSB-12.1, in these door locations:
- Entrance-door glass where the glass area exceeds 0.5 m² and extends to less than 900 mm from the bottom of the door.
- Sidelights wider than 500 mm that could be mistaken for doors.
- Storm doors, and sliding doors within or at entrances.
Door panes that aren't safety glass must still meet area limits by thickness in the code's structural table.
The federal Glass Doors and Enclosures Regulations add a product rule. Exterior doors sold in Canada with a glass pane over 0.5 m² whose lowest edge is under 900 mm from the bottom of the door must use safety glass.
A quick example
Take a full-length insert of 22 × 64 in, a size sold as standard replacement glass. That's about 0.91 m² of glass, and a full-length lite reaches well below 900 mm from the bottom of the door. It has to be safety glass. A small half-moon lite high in the door doesn't trigger the rule. When in doubt, specify tempered or laminated glass stamped to CAN/CGSB-12.1; it's the simplest way to stay compliant. Our tempered vs laminated guide explains the difference.
Privacy options compared
| Option | Privacy | Daylight | Good to know |
|---|---|---|---|
| Clear tempered | None | Full | Pair with a blind if needed |
| Frosted or acid-etched glass | High | High | Clean, modern look; a standard insert option, and an etch is permanent |
| Textured or obscure glass | Medium to high | High | Blurs shapes rather than hiding them completely |
| Decorative or leaded (caming) | Medium | Medium | One of the biggest price drivers on a door |
| Laminated with a frosted interlayer | High | High | Adds break-in resistance; holds together when cracked |
| Frosted film on existing glass | Medium to high | High | Low cost and removable; not a structural upgrade |
| Security film on existing glass | None (clear) | Full | 8 mil film is rated to ASTM F1233 and UL 972 and should be anchored to the frame |
A caution on films. Glass that absorbs more heat runs hotter in the sun and is more prone to thermal stress cracks. On a sealed insert in a south- or west-facing door, ask before applying a dark or heavily tinted film.
New glass, same door
Replacing the glass makes sense whenever the slab is straight and solid and the door latches and seals, or can be made to with a hardware or weatherstripping repair. The exception is a steel skin rusted through, a fibreglass skin delaminating, a rotted frame or sill, or a wish for a different size or swing. That's a door-replacement job, not a glass repair, and we'll tell you if that's where you are. The new-door prices below are for comparison: they're what a glass-only job avoids.
| Job | Typical range (CAD) |
|---|---|
| Tempered glass pane, replaced | $450–$800+ |
| For comparison: new steel entry door, basic, installed | $2,500–$4,000 |
| For comparison: new steel entry door with sidelites | $5,000–$9,000 |
| For comparison: new fibreglass entry door with sidelites | $6,000–$12,000+ |
Permits and heritage districts
Replacing only the glass in a door or sidelight doesn't change the opening; it's a repair. For whole doors, Toronto's rule is that replacing a door in an existing opening of a detached, semi or row house with one dwelling unit needs no building permit, provided the opening's size and location don't change and the structure isn't altered. Replacing doors in other building types, or enlarging or adding an opening, needs a permit.
In Toronto's heritage conservation districts, replacing doors visible from the sidewalk needs a heritage permit, while routine maintenance doesn't. Markham exempts "repair of broken window panes to original specifications" from heritage permits but requires a Minor Heritage Permit to replace windows or doors. If you're changing the look of visible decorative glass in a heritage district, check with the city first. More in our permits guide.
What we'd do
- Measure the glass and the surround, and note the thickness of the existing lite.
- Check where the glass sits against the safety-glass rules, not just what was there before.
- Look at the slab, frame and weatherstripping, and fix worn weatherstripping or hardware at the same visit. If the slab or frame has failed, we'll tell you it's a door-replacement job rather than put new glass in it.
- Order the glass or insert to size, then swap it with the door left in place and reseal the surround.
Next step
For cracked, fogged or dated door and sidelight glass, the fix is new glass in the door you have. Send a photo of the door from inside and outside, with a tape measure across the glass, through our contact page for a free quote, or read about our door repairs.