Window Tint Percentages Explained: Choosing Between 5%, 20%, 35%, and 50%

What 'Percentage' Actually Means

A tint's percentage refers to visible light transmission — roughly, how much light passes through the film and glass combined. A 50% film lets about half the visible light through; a 5% film lets very little through and looks nearly opaque from outside. The lower the number, the darker and more private the film looks — and the more it also cuts glare and interior heat.

Untinted automotive glass already blocks some visible light on its own, so the percentage on a tint film isn't the only thing determining how dark a window looks in person — but it's the number that lets you compare shades consistently and the one we use to talk through options before installing anything.

5% and 20%: Darkest, Most Private (Rear Windows)

5% and 20% are our darkest SunTek shades — the ones most drivers picture when they think of tinted windows. They offer the most privacy and the strongest glare and heat reduction, which is exactly why they're typically reserved for rear side windows and the rear windshield, where Ontario's rules allow far more flexibility than the front of the vehicle.

The visual difference between 5% and 20% is noticeable side by side, even though both look quite dark from the outside — 5% is close to opaque in most lighting, while 20% still reads as clearly darker than factory glass but lets a bit more silhouette and detail show through. Drivers who want maximum privacy tend toward 5%, while those who want a dark look without going quite that far often land on 20%.

Because these shades cut the most visible light, they're also the ones that make the biggest difference on a hot day — less solar heat making it through the glass means a noticeably cooler cabin and less strain on your air conditioning, on top of the privacy benefit.

35% and 50%: Lighter Options for Front Windows

35% and 50% let noticeably more light through while still cutting a meaningful amount of glare and heat — enough to be worth installing, without darkening the windshield-adjacent glass to the point that visibility becomes a concern. These lighter shades are the ones most commonly matched to front side windows, where visibility for the driver and for anyone looking into the vehicle matters more.

Even at 50%, drivers usually notice a real difference in glare and afternoon sun compared to untinted glass — it's a meaningfully lighter shade than 5% or 20%, but it's not the same as no film at all.

Common Shade Combinations We Install

There's no single most popular combination, since it depends on the look and privacy each driver wants — but a common pattern is a lighter, compliant shade like 35% or 50% on the front side windows, paired with a darker 5% or 20% on the rear side windows and rear windshield. That split gives you meaningful heat and glare reduction up front without pushing past what's appropriate for the driver's visibility, while maximizing privacy and heat rejection in the back where the rules allow it.

Some drivers choose a uniform shade across every window instead, usually when the front windows are already legally allowed more flexibility than the standard passenger vehicle default, or when matching the look across all windows matters more than maximizing any single benefit. Either approach is a legitimate starting point — the right one depends on what you're actually trying to solve for.

Matching Shades to Ontario's Rules

Ontario treats front windows more strictly than rear glass, which is exactly why most installs mix shades rather than using one percentage across the whole vehicle — a lighter, compliant option up front and a darker shade in the back. We walk through the right combination for your vehicle before installing anything; for the full legal framework, see our breakdown of Ontario's window tinting laws.

Why a Professional Installer Matters for Shade Choice

Choosing percentages isn't just a style decision — it's also a compliance one, and getting it wrong on the front windows can mean a Highway Traffic Act violation and, in some cases, having to remove the film you just paid for. That's exactly why every install here is done by our certified team, who'll walk you through which shade makes sense for which window before anything goes on the glass, rather than after.

A shop that lets you pick any percentage for every window without asking questions isn't doing you a favour — it's leaving you exposed to a violation down the road. Part of what you're paying for in a professional install is that judgment call being made correctly the first time, not just the physical application of the film itself.

It's also backed by our workmanship guarantee — if a shade doesn't look or perform the way you expected once you've had a chance to live with it, tell us and we'll address it.

Bring in a photo or two of the look you're going for if you have one, and mention anything specific you're trying to solve — glare on a long commute, an overheated back seat for kids or pets, or simply wanting more privacy. That context makes it much easier to land on the right combination the first time instead of adjusting after the fact.

It's also worth thinking about resale down the line — a compliant, well-installed tint job is a selling point for most buyers, while an improperly dark or poorly applied one can be a deduction a buyer or dealer flags during inspection.