Window Tint Percentage: 7 Honest Answers for Moncton Drivers
Most people who walk into the shop already know they want tint. What they do not know is which window tint percentage to ask for. It is the single most common question we get, and it deserves a better answer than a chart on a wall, because it is the decision you live with every single day and the expensive one to change your mind about.
Two things make the choice easier than it first looks. The percentages mean something specific and slightly backwards from what most people assume. And in New Brunswick, the law already makes the decision for you on half your glass, which leaves a much smaller question to actually answer.
Table of Contents
The short version
- VLT means Visible Light Transmission — the share of light that gets through. A lower number is a darker film. 5% is nearly black, 70% is barely noticeable.
- In New Brunswick your windshield and both front side windows must transmit at least 70% VLT. That is not a preference, it is the Motor Vehicle Act.
- Rear side windows and the rear window carry no restriction. That is where your window tint percentage is genuinely a choice.
- Darkness is not the same thing as heat rejection. A good light film can out-perform a cheap dark one, and the manufacturer data further down this page shows it plainly.
- 35% is the window tint percentage the most people are still happy with a year later. 20% is the usual pick when privacy is the point.
What does a window tint percentage actually mean?
VLT stands for Visible Light Transmission, and it is the percentage of visible light that passes through the glass and the film together. This is where nearly everyone trips on first contact: a lower number means a darker window. When somebody asks for “20% tint” they are asking for film that lets 20% of the light through, not film that blocks 20% of it.
Here is roughly what each window tint percentage looks like in the real world:
- 5% VLT — limo tint. You cannot see in from outside in daylight, and you can barely see out at night.
- 15% VLT — very dark. Strong privacy, and a real reduction in what you can see after sunset.
- 20% VLT — dark and popular. Still driveable at night for most people.
- 35% VLT — clearly tinted, useful glare reduction, very little night-visibility cost.
- 50% VLT — light. Reads as tint in daylight, essentially no impact after dark.
- 70% VLT — barely perceptible. This is the legal floor for New Brunswick front glass.
One wrinkle worth knowing before you settle on a window tint percentage. Your factory glass is not perfectly clear to begin with — most automotive glass transmits somewhere in the region of 70 to 80% on its own. Film VLT and glass VLT combine, so a 35% film on ordinary door glass measures a little under 35% once it is on the car. Any installer who works near a legal limit has to account for that, and if you are anywhere near the front-window threshold it matters a great deal.
What window tint percentage is legal in New Brunswick?
The rule is short. Your windshield and both front side windows must let through at least 70% of visible light. Your rear side windows and rear window have no limit at all.
| Window | New Brunswick limit |
|---|---|
| Windshield | Minimum 70% VLT |
| Front side windows | Minimum 70% VLT |
| Rear side windows | No restriction |
| Rear window | No restriction |
New Brunswick is unusual here: it is the only province in Canada that permits aftermarket film across the full windshield, provided that windshield still meets the 70% threshold. That sounds like an opportunity and it partly is, but there is a complication around how individual MVI inspection stations read the manual, and it is worth understanding before you spend money. We covered that properly, including the fine amounts, in our guide to window tinting laws in New Brunswick. If you are thinking about front film at all, read that one first.
The practical effect on today’s decision is simple, and it is the part most people miss: you are choosing a window tint percentage for the back of the car only. Up front the answer is already 70%, and the only real question there is how good the film is.
Does a darker window tint percentage keep the car cooler?
Not nearly as much as people expect, and this is the misconception that costs Moncton drivers the most money.
Heat that comes through glass is mostly infrared, and blocking infrared is a property of what the film is built from, not how dark it appears. Darkness handles glare and privacy. Material handles heat. They are two separate jobs, and buying the first hoping to get the second is the most common mistake in this business. Which material you pick is the other half of the decision, and we cover ceramic vs carbon window tint separately.
You do not have to take our word for it. 3M publishes the numbers for its Crystalline series, and because that line runs from very light to fairly dark using the same technology, it isolates the effect of darkness cleanly. From 3M’s published technical data sheet for the Crystalline series, measured on their reference glass:
| Film | VLT | Total solar energy rejected | Infrared rejection | UV blocked |
|---|---|---|---|---|
| Crystalline Black 80 | 72% | 45% | 59% | 99.9% |
| Crystalline Black 50 | 48% | 56% | 68% | 99.9% |
| Crystalline Black 30 | 29% | 61% | 68% | 99.9% |
Read the first and last rows together. Going from a film you can barely see to one that is properly dark — a huge visual change — moves total solar energy rejection by sixteen points. Meanwhile the UV figure does not move at all. That is the whole argument in one table: within a given quality of film, darkness buys you privacy and glare control, and only a modest amount of heat.
Two honest caveats. We are citing 3M because they publish clear data across a single product line, not because we are telling you to buy it. And those figures are 3M’s, measured their way on their reference glass — a different manufacturer’s film at the same window tint percentage will test differently. That is exactly why a percentage alone tells you very little about how a car will feel in July.
If heat is your actual goal, the useful move is to spend on film quality and stay lighter. A quality nano-ceramic film at 50% or 70% will beat a budget dyed film at 20% on heat, while leaving your night vision intact and keeping you legal on every window on the car. The difference between film types is a longer subject and we have written it up in what ceramic window tint in Moncton actually buys you.
So which window tint percentage should you pick?
If you want privacy — 20% or 15%
You want people at a stoplight not to see into your back seat. 20% does that convincingly in daylight and stays manageable at night for most drivers. 15% does it better and is a genuine commitment.
Worth knowing before you commit: privacy tint works far better in daylight than after dark. The moment your interior light is on, a dark window tint percentage hides much less than you would think.
If you want balance — 35%
If we had to name the one window tint percentage that leaves the most people satisfied a year later, it is 35% on the rear glass. It reads clearly as tinted, it cuts glare, it keeps your mirror usable reversing out of a dark parking lot in February, and it does not make an already-dim Maritime December any worse.
If you want the look without the commitment — 50%
Visible, subtle, essentially no night-driving cost. It also pairs neatly with the 70% film you are legally required to run up front, so the car reads as deliberate rather than mismatched.
If you want maximum darkness — 5%
Legal on rear glass in New Brunswick and genuinely difficult at night, particularly reversing. If you rely on a backup camera it matters less. If you do not have one, sit in a 5% car after dark before you commit to that window tint percentage.
The combinations we install most
Most jobs land on one of a handful of pairings. This is the window tint percentage split we fit most often, and why each one gets chosen.
| Front / rear | Who it suits |
|---|---|
| 70% front, 35% rear | The default. Legal up front, a visible difference behind, easy at night. |
| 70% front, 20% rear | Privacy-focused daily drivers. |
| 70% front, 50% rear | Subtle and uniform. Popular on lighter-coloured cars. |
| 70% front, 5% rear | Maximum privacy. We would want you to have a backup camera. |
| 70% ceramic all round | Heat and UV with no visual change. More popular than people expect. |
When we would tell you not to bother
There are cars we would rather not take money for, and it is better to say so here than after you have paid.
If your rear glass already has heavy factory privacy glass — common on SUVs, vans and a lot of crossovers — adding a dark film behind it often changes very little visually while costing you real night visibility. In that situation the honest recommendation is either a light ceramic film for the heat and UV, or nothing at all on those windows and your budget spent on the front instead.
If you are selling the car in a few months, a dark window tint percentage narrows your buyer pool rather than widening it. And if the existing film on the car is bubbling or purple, removal is its own job with its own cost, and any quote that does not mention removal is a quote you should ask more questions about. What tinting actually costs, removal included, is broken down in our straight answer on window tinting cost in Moncton.
Three mistakes worth avoiding
1. Going darker than you will be comfortable with at night. Everyone overestimates their night vision, and everyone’s night vision gets worse over time. Caught between two numbers, take the lighter one. Nobody has ever come back to complain that their tint was slightly too light.
2. Assuming darker means cooler. Covered above with the manufacturer’s own figures. It is the misconception that leads people to buy a cheap dark film and feel let down by the first hot week in July.
3. Putting illegal film on the front and planning to sort it out later. Later is your MVI inspection. Removal costs money on top of the film you already paid for, plus a possible fine. If you want dark front windows, New Brunswick is not the place, and we will not install them.
How the number actually gets checked
If you have ever wondered how anyone proves what is on your glass, the answer is a small handheld meter that clamps over the window and reads straight through it. It reports a single figure: the light getting through the glass and the film together.
That combined reading is the part worth understanding. The meter does not know or care what your film is rated at. It measures the finished result, so a film sold as 70% applied over glass already transmitting a little under 80% can land below the legal line even though the box said 70%. This is the most common way a well-intentioned front-window job fails an inspection, and it is why the window tint percentage printed on the packaging is not the whole story.
It is also why we measure before we quote rather than after we install. If you are bringing us a car that already has film on it, or you are considering the front glass at all, the meter comes out first. It takes a minute, and it removes the guesswork from a window tint percentage decision that is otherwise expensive to get wrong.
Come and look at it first
A window tint percentage on a screen is close to meaningless. The same 35% looks one way on a white car and another on a black one, different again on deeply curved rear glass, and different once more at dusk rather than noon.
Come by the shop at 181 White Oak Terrace and we will hold sample film against your own glass in daylight. It takes ten minutes, it costs nothing, and it is the difference between choosing a number and choosing a result. Our nano-ceramic packages start at $150, and you can see the full range on our window tinting page.
Window tint percentage FAQs
Is a lower window tint percentage darker or lighter?
Darker. The number is how much light gets through, so 5% is nearly black and 70% is almost invisible. This catches out most people the first time they book.
What is the darkest legal window tint percentage in New Brunswick?
On the windshield and front side windows, 70% VLT is the legal floor, so that is as dark as you may go. On rear side windows and the rear window there is no limit, so 5% is legal there.
Will 70% film on the front do anything at all?
Yes, and this surprises people. Quality automotive film blocks roughly 99% of UV whatever its darkness, and a good ceramic at 70% still rejects meaningful infrared. You are buying heat and UV performance rather than a change in appearance.
Can I have a different window tint percentage on each window?
Yes, and most cars we do are exactly that — 70% front, something darker behind. Mixing within the rear is possible too, though matching the rear sides to the rear window usually looks more deliberate.
Does tint interfere with GPS, cell signal or keyless entry?
Ceramic and carbon films are non-metallic and non-conductive, so they do not. Older metallic films can. If you have had signal trouble after a tint job elsewhere, that is usually the reason.
How long before I can roll the windows down?
Leave them up for two to three days while the adhesive cures. In a damp Moncton spring, err towards the longer end. Some haze or small water pockets during curing are normal and clear on their own.
Can you match the window tint percentage already on my car?
Usually, if we can measure what is there. Bring it in and we will put a meter on the glass. Matching aged film exactly is not always possible, because film shifts slightly as it ages, and we will tell you honestly if a match will be visible.
The bottom line
New Brunswick has already made the front-glass decision for you at 70% VLT. Behind that, 35% keeps the most people happy, 20% is the privacy pick, and 5% is a real commitment you should sit inside before buying. Whatever window tint percentage you land on, put your money into the film’s quality before its darkness — that is where the heat performance actually lives.
More than 1,000 cars through the shop, and 4.9 out of 5 from more than 155 Google reviews. Call or text (506) 269-0981, or drop in seven days a week between 10 AM and 7 PM.