What thickness of bulletproof glass is recommended for an entrance door?

For an entrance door, most people recommend laminated safety glass with a thickness of 8 to 10 mm, depending on the security level you're looking for. If you want something more robust, 12 mm offers quite a bit of extra protection, but it gets pretty expensive and heavy.

I have 10 mm bulletproof glass on my front door and honestly I think it's the ideal balance point - it offers serious protection without being absurdly heavy or expensive. If your area is quieter, 8 mm already gives you plenty of security, but if there are break-ins in the region or you just want to sleep more soundly, go for 10 mm without hesitation. Anything above that (like 12 mm) is overkill for most cases and the glass gets so heavy it can put stress on the hinges over time.

What nobody really mentions much is that the frame type matters a lot too - a 10 mm glass in a weak frame does you no good, you need the whole structure properly reinforced or the door will give way anyway!

The rigidity of the frame really is fundamental, like someone already said, but there's a practical detail that changes everything: try asking the installer to show you the classification certificate (like BR or SP - you'll find it in the glass documentation) before you buy, because not all 10 mm glass is the same and some have more resistance capacity than others depending on the composition. What works well in practice is 10 mm for most houses with decent security, but if your entrance is right on the street with a lot of traffic, going with 12 mm is worth the extra cost - thicker glass is not only more resistant but also dampens traffic noise better, and that's a bonus nobody expects!

You have to go by the numbers, but you also have to understand what they mean. When I see recommendations of 8 to 10 mm, people are usually thinking of standard laminated or tempered glass. Now, ballistic glass is a different thing entirely - it's multi-layered, with resin between the layers, and then 6 or 8 mm of ballistic glass offers more resistance than 10 mm of regular glass. The problem is that a lot of people confuse these two categories and end up paying more or buying inadequate protection.

There's one practical thing nobody wants to admit: you're going to pay considerably more for each extra millimetre, and the truth is that 8 mm of ballistic glass with BR3 or BR4 rating (which is what you're looking for in a residential entrance) is enough in most cases. You only go for 10 or 12 mm if you're really in a high-risk area or if you want to sleep more soundly even though statistically the risk is low. The thing about the frame that someone mentioned is 100% real - it doesn't matter at all if you have 15 mm ballistic glass if the frame is weak, but that's assumed when you contact credible installers.

Before you decide, get three quotes from companies with verifiable track records and demand that they include the classification certificate on paper. It's not about blindly trusting - it's about confirming that what they're selling you is really what they say it is. A price that's way too low is a red flag, but excessive price can also mean they're selling you unnecessary thickness.