Types of Window Glass | Low-E, Tempered, Laminated & More Explained | SilverLine Exteriors

Every window that leaves our Port Coquitlam shop is built from the same handful of decisions: how many panes, what coating, what gas between them, and whether the glass needs to be tempered or laminated. Those choices are the types of window glass you will see on a quote, and homeowners rarely ask about any of them. They pick a style and a colour, and the glass gets treated as an afterthought. That is backwards. The frame is what you see. The glass is what does the work.

Since 2007 we have manufactured our own vinyl windows and installed them across Metro Vancouver, so we spec glass every single day. This guide covers the types of window glass you will run into on a quote, what each one does, what it costs, and which ones make sense for a house in a wet, mild climate like ours.

The short answer: which type of window glass is best?

For most homes in the Lower Mainland, the best window glass is a double-pane insulated unit with a Low-E coating and argon fill. That combination meets the current ENERGY STAR requirement for Canada, costs $800 to $1,000 per window installed with our own SilverLine frames, and handles the two things Vancouver weather throws at a window: months of rain and damp, and winter nights that hover around freezing.

From there you add glass types only where a room needs them. Tempered glass goes wherever the BC Building Code requires safety glazing. Laminated glass goes on the side of the house that faces traffic or a SkyTrain line. Obscure glass goes in bathrooms. Triple pane goes in bedrooms on a noisy street or in homes where the owner wants the last few percent of insulation. Nobody needs every option on every window, and a quote that puts them everywhere is padding the bill.

Window glass is built in layers, not picked off a shelf

A modern residential window does not use a single sheet of glass. It uses an insulated glass unit, usually called an IGU or a sealed unit. Two or three panes are separated by a spacer bar, the edges are sealed, and the gap between the panes is filled with air or an inert gas. The coating sits on one of the inside glass surfaces, protected from weather and cleaning.

So when people ask about “types of window glass,” they are usually asking about five separate things at once:

• How many panes (single, double, or triple)
• Whether there is a Low-E coating, and which one
• What fills the gap (air or argon)
• How the glass was treated for safety (annealed, tempered, or laminated)
• Whether the glass is clear, obscured, tinted, or decorative

A single window can combine several of these. A bathroom window in a Burnaby home might be double pane, Low-E, argon filled, tempered, and obscured all at once. We cover each layer below, then pull it together in a comparison table.

Types of window glass by number of panes

Single pane

One sheet of glass in the frame. We still pull these out of 1960s and 1970s homes in East Vancouver, Burnaby, and New Westminster, usually in aluminum frames. Single pane glass has a U-factor around 5.0 W/m²·K, which means it loses heat roughly four times faster than a modern double-pane unit. It also sweats. If you wake up to water pooled on the sill from October through March, this is why. Nobody installs single pane in a house anymore, and no current rebate program will touch it.

Double pane

Two panes with a sealed gap between them, typically 12 to 16 mm wide. This is the standard for every window we build. On its own, a plain double-pane unit with air fill is a big step up from single pane. Add a Low-E coating and argon, and the U-factor drops to roughly 1.2 to 1.4 W/m²·K, which is where the ENERGY STAR line for Canada sits. Double glazed windows from SilverLine run $800 to $1,000 per window installed.

Triple pane

Three panes, two gaps, and room for two Low-E coatings. Triple pane pushes U-factors down to about 0.8 to 1.0 W/m²·K and cuts more noise than double pane because of the extra mass and the two air spaces. We manufacture triple pane in our own shop, and it runs $1,000 to $1,400 per window installed.

Is it worth it in Vancouver? Sometimes. Our climate is the mildest in Canada, so the heating-bill payback is slower here than in Calgary or Winnipeg. Where triple pane earns its keep locally is noise (Lougheed Highway, Kingsway, the SkyTrain corridors) and condensation resistance on cold clear nights. We wrote a full breakdown with the payback math on our triple pane windows page.

Low-E glass

Low-E stands for low emissivity. It is a metallic coating, thinner than a human hair, applied to one surface of the glass inside the sealed unit. The coating lets visible light through but reflects long-wave heat. In winter it bounces your furnace heat back into the room. In summer it reflects some of the sun’s heat back outside. It also blocks most of the UV that fades hardwood floors and furniture.

There are different Low-E formulas. The two that matter for BC homes are a high-solar-gain coating (lets more winter sun heat in, better for north and east exposures) and a low-solar-gain coating (blocks more summer heat, better for big south and west windows). We pick per elevation on most jobs rather than using one coating for the whole house. A west-facing living room in Port Moody that bakes in July gets a different coating than a north-facing bedroom in the same house.

Low-E is included on every window we sell. There is no version of a modern replacement window where leaving it off makes sense. If you want the chemistry, our Low-E coating guide goes deeper.

Argon-filled glass

Argon is an inert gas that is denser than air, so it slows heat transfer across the gap between panes. It is colourless and harmless, and it costs almost nothing extra. Filling a sealed unit with argon instead of air improves the U-factor by roughly 10 to 15 percent. Krypton does the same job better in narrow gaps but costs far more, so it rarely shows up in residential windows here.

Every sealed unit we manufacture is argon filled. The thing to watch for is how well the unit is sealed, because argon slowly escapes through a failed edge seal. That is also how you get fog between the panes years later. A good spacer and a proper dual seal matter more than the gas itself. More on that in our argon gas windows article.

Tempered glass

Standard window glass is annealed: it is cooled slowly at the factory and breaks into long, sharp shards. Tempered glass is reheated and cooled fast, which puts the surface under compression. The result is about four times stronger than annealed glass, and when it does break, it crumbles into small blunt pebbles instead of daggers.

This is not optional in certain spots. The BC Building Code requires safety glazing (tempered or laminated) in locations where someone could fall into the glass. In a typical house that means:

• Glass in any door, and sidelights next to a door
• Windows in bathrooms near a tub or shower
• Windows beside stairs and landings
• Large panes that sit close to the floor, such as a low picture window or floor-to-ceiling glass

Our final measure flags every opening that needs tempered glass, and it is one of the things we check when a homeowner brings us a competing quote. A quote that prices a bathroom window or a stairwell window with standard glass is either a mistake or a corner being cut. Tempered adds a modest amount per pane, usually well under $150 on a typical residential size, and it cannot be cut or drilled after tempering, so sizes have to be right the first time. That is one reason we do a separate final measure on every job.

Laminated glass

Laminated glass is two sheets of glass bonded to a clear plastic interlayer, the same construction as a car windshield. When it breaks, the pieces stay stuck to the interlayer, so the window holds together. It also counts as safety glazing under the code.

In Metro Vancouver, though, the main reason we spec laminated glass is noise. The plastic interlayer dampens sound in a way that an extra pane of plain glass does not. A double-pane unit with one laminated pane will outperform a standard triple-pane unit on traffic noise, at a lower cost. We use it on homes backing onto Highway 1 in Burnaby and Coquitlam, on condos along the Expo Line, and on anything near a school field or a fire hall. Laminated glass also blocks nearly all UV and is much harder to break through than tempered, which makes it the choice for ground-floor windows where security is the concern.

Expect laminated to add roughly 15 to 25 percent to the glass cost of a given window, depending on size. On a whole-house job we usually laminate only the elevation that faces the noise and leave the rest standard.

Obscure and privacy glass

Obscure glass has a texture pressed into one surface so light passes through but the view does not. Patterns range from a fine sandblast look to heavy ripples. It goes in bathrooms, ensuites, and the occasional side window that looks straight into a neighbour’s kitchen on a 33-foot Vancouver lot. It can be combined with tempered glass (and in a bathroom it usually has to be) and with Low-E, since the coating sits on a different surface from the texture.

Frosted film applied after the fact is the budget alternative. It works, but it scratches, peels at the edges over a few years, and looks like film. If you are replacing the window anyway, build the privacy into the glass.

Tinted, reflective, and decorative glass

Tinted glass has colour mixed into the glass itself, usually grey, bronze, or green, to cut glare and solar heat. It was common before Low-E coatings existed and still shows up on commercial buildings. In a house it darkens the room year-round, including in a Vancouver January when you want every bit of daylight you can get. A low-solar-gain Low-E coating does the same summer job without the gloom, so we rarely recommend tint for homes here.

Reflective glass has a mirror-like metallic layer on the outside. Same idea, stronger effect, and it looks like an office tower. Skip it on a house.

Decorative glass covers bevelled panels, leaded designs, stained inserts, and internal grilles. We build these mostly for entry doors, sidelights, and transoms rather than main windows. Our decorative glass options page shows what we can put in a sealed unit.

Comparison: types of window glass at a glance

How to read the glass ratings on a quote

Three numbers describe how a glass unit performs, and they show up on the NRCan label and on any decent quote.

U-factor measures heat loss. Lower is better. Canada reports it in W/m²·K, and the ENERGY STAR threshold for windows across Canada is a U-factor of 1.22 or lower, or an Energy Rating of 34 or higher. Solar heat gain coefficient, or SHGC, measures how much of the sun’s heat comes through, on a scale from 0 to 1. Visible transmittance measures how much daylight gets through, also 0 to 1. Each Low-E coating shifts these numbers, which is why we choose coatings by exposure instead of by default.

Metro Vancouver sits in the mildest climate zone in the country, so a window that clears the ENERGY STAR line is plenty for a normal house here. Chasing a U-factor of 0.8 is a fair goal if you are doing a full envelope upgrade or building to a high BC Energy Step Code level. For a standard replacement in a 1980s Coquitlam split-level, the money is usually better spent on laminated glass for the loud side and on a proper install. Our U-value guide for BC homeowners walks through the label line by line.

What we recommend room by room

On a typical whole-house replacement in Metro Vancouver, the glass spec shakes out like this when we build the quote.

Living room and kitchen get double pane, Low-E, argon. If the room faces west with a big picture window, we switch to the low-solar-gain coating so the room does not overheat in August. Bedrooms get the same unless they face a busy road, in which case one pane goes laminated. Bathrooms get obscure and tempered, because the code requires tempered near a tub and the privacy is the point. Stairwell and landing windows get tempered. Basement windows near grade often get tempered too, and if the basement is a suite, egress size matters more than glass type. Patio doors are always tempered, both panes, no exceptions.

Triple pane comes up when the owner asks for it, when the house sits right on a highway, or when a north-facing bedroom has a condensation history. On the coast, we would rather put laminated glass on the two noisy windows than triple pane on all twenty.

What different types of window glass cost

Glass is one part of the window price, alongside the frame, hardware, and installation. As a rule of thumb for SilverLine windows installed in the Lower Mainland in 2026:

• Double pane, Low-E, argon: $800 to $1,000 per window
• Triple pane: $1,000 to $1,400 per window
• Tempered: adds a modest amount per pane, generally under $150 on a typical size
• Laminated: adds roughly 15 to 25 percent to the glass portion
• Obscure: small upcharge, usually paired with tempered in bathrooms

Size, shape, and access change these numbers. A 6-foot picture window on a second storey costs more than a 3-foot bathroom slider, regardless of glass type. Full price tables by window style are on our window replacement cost Vancouver page. BC Hydro and CleanBC Better Homes run rebate programs for qualifying window upgrades; check the current program terms before you sign, since the eligible ratings change.

Because we manufacture the sealed units and the frames ourselves in Port Coquitlam, there is no distributor markup on the glass. That is a large part of why our pricing lands where it does. Read more about how our window replacement process works, or see the full list of options on our window features page.

Frequently asked questions about window glass types

What are the four main types of window glass?

Most guides list annealed, tempered, laminated, and insulated (double or triple pane) as the four main types. In practice a modern window combines them: the insulated unit is the assembly, and each pane inside it is either annealed, tempered, or laminated. Low-E is a coating applied to one of those panes, not a separate glass type.

Which type of glass is best for windows in Vancouver?

Double pane with Low-E and argon is the right baseline for the Lower Mainland’s mild, wet climate. Add laminated glass on windows facing traffic or transit noise, tempered where the code requires it, and obscure glass in bathrooms. Triple pane is a reasonable upgrade for noisy sites or owners who want the lowest U-factor, but it is not necessary for a typical home here.

Is Low-E glass worth it in a mild climate?

Yes, and there is no reason to buy a window without it. Low-E cuts winter heat loss, blocks the UV that fades floors and furniture, and is required to reach ENERGY STAR ratings in Canada. It is standard on every window we manufacture.

Do I need tempered glass in my windows?

Only in locations the BC Building Code defines as hazardous: glass in and beside doors, in bathrooms near a tub or shower, beside stairs, and in large panes close to the floor. Elsewhere, standard annealed glass in a sealed unit is fine. Your installer should identify the tempered locations during the measure.

What is the difference between tempered and laminated glass?

Tempered glass is heat treated to be about four times stronger and to break into small blunt pieces. Laminated glass is two sheets bonded to a plastic interlayer that holds the pieces in place when it breaks. Both count as safety glass. Laminated also blocks noise and is much harder to break through, so it is the better choice for sound control and security. Tempered is cheaper and is the usual choice where the only concern is meeting code.

How can I tell what type of glass is in my current windows?

Look at the spacer bar between the panes; many sealed units have a stamp there listing the manufacturer, the date, and sometimes the glass type. Tempered glass usually has a small etched mark in one corner. Hold a lighter or a phone flashlight near the glass at night: a Low-E coated pane shows one reflection with a slightly different colour than the others. If you see fog between the panes, the seal has failed, and the argon is long gone.

Does triple pane glass stop condensation?

It reduces it. The inside surface of a triple-pane unit stays warmer on cold nights, so moisture is less likely to condense there. Condensation on the room side of a window is a humidity problem first, though. Bathroom fans, range hoods, and keeping indoor humidity under about 40 percent in winter do more than any glass upgrade.

Get the right glass in the right window

The glass spec is the part of a window quote that most companies leave vague. We do not. Every SilverLine quote lists the pane count, the coating, the fill, and the safety treatment for each opening, and our final measure confirms which windows need tempered or laminated glass before anything goes into production.

We have installed windows across Metro Vancouver since 2007, hold nine HomeStars awards, carry a BBB A+ rating, and have 107 Google reviews at 4.5 stars. Our shop is at Unit 5, 1560 Broadway St in Port Coquitlam, about 30 minutes from downtown Vancouver on the Lougheed. Call 604-942-0488 or request a quote, and we will walk your house with you and tell you which windows need which glass.