How thick should glass be for a partition wall?

10mm toughened glass is the standard choice for most partition walls up to 2500mm in ceiling height. For ceilings between 2500mm and 3000mm we recommend 12mm toughened, as 10mm panels can start to bow at that height. If sound reduction matters, choose 12.8mm acoustic laminated glass instead.

Is 12mm glass stronger or safer than 10mm?

Both 10mm and 12mm partition glass are toughened safety glass to BS EN 12600 and meet the same UK safety standard. 12mm is not stronger or safer in everyday use, it's recommended for taller partitions because the extra rigidity stops the glass bowing. For ceilings under 2500mm, 10mm gives you the same safety performance for less money.

Does 12mm glass give better sound reduction than 10mm?

No. The sound difference between 10mm and 12mm toughened glass is not meaningful in practice. If you need a partition to reduce sound, you should use 12.8mm acoustic laminated glass, which is specifically designed for sound dampening and reduces sound by 38dB in a single glazed channel or 46dB in a double glazed channel.

What is acoustic laminated glass?

Acoustic laminated glass is made from two sheets of 6mm glass bonded together with a specialist acoustic interlayer that dampens sound waves. The 12.8mm version reduces sound by 38dB in a single glazed partition channel and by 46dB in a double glazed channel. It's ideal for boardrooms, meeting rooms, HR offices and any space where private conversations need to stay private.

Why does an acoustic glass partition need a framed door?

A frameless glass door has a small gap around it where it pivots. That gap lets sound straight through, which defeats the purpose of the acoustic glass. A framed door seals around the leaf, keeping the sound reduction performance of the partition intact. The door panel itself is supplied in 12mm toughened glass rather than acoustic laminated, because the laminate interlayer is visible on the edges and looks unfinished on a door.

How Thick Should Glass Be for Partition Walls? | Toughened Glass Solutions

Short answer: 10mm toughened glass for most partitions, 12mm if your ceiling is 2500mm or taller, and 12.8mm acoustic laminated if you need to reduce sound.

That's the honest answer most people don't get. The full version, with the reasons behind each choice, is below.

The three options we sell

We supply three types of glass for partitions. Most customers end up with the first one.

Glass type	When to use it	Weight
10mm toughened	Standard partitions up to 2500mm ceiling height	25 kg/m²
12mm toughened	Ceilings from 2500mm up to 3000mm	30 kg/m²
12.8mm acoustic laminated	When sound reduction matters	32 kg/m²

For a real price on any of these for your opening size, use our glass partition calculator. It prices and orders the complete kit in one place.

Why 10mm works for most partitions

10mm toughened glass is the right answer for the vast majority of partitions. It's strong, safe (toughened to BS EN 12600), noticeably cheaper than 12mm, and lighter to handle on site.

That weight difference matters more than people realise. A 2400mm by 900mm panel of 10mm weighs around 54 kg. The same panel in 12mm weighs around 65 kg. Your fitter has to lift each panel into the ceiling channel, and 11 extra kilos per panel adds up across a partition.

There's a common assumption that thicker glass must be safer or stronger. For partitioning, that's not really the case. Both 10mm and 12mm are toughened safety glass and both meet the same UK safety standard. The difference is about height, not safety.

When you need 12mm

Once your ceiling height passes 2500mm, we recommend 12mm. At that height a 10mm panel becomes tall and slender enough that it can start to bow, and 12mm gives the extra rigidity to stay flat. Our maximum recommended height for 12mm is 3000mm.

Between 2500mm and 2700mm there's a small grey area. 10mm is still possible at the customer's risk, but 12mm is the safer choice. From 2700mm upwards 12mm is always our recommendation.

One thing worth clearing up: 12mm does not give you any meaningful sound reduction over 10mm. People sometimes ask for 12mm thinking it will quiet down a meeting room. It won't. If sound is the reason, you want acoustic laminated, which is a completely different product.

When to choose 12.8mm acoustic laminated

12.8mm acoustic glass is the only one of the three that's actually designed to reduce sound. It's made from two sheets of 6mm glass bonded together with a specialist acoustic interlayer that dampens sound waves.

The sound reduction figures are:

38dB when fitted in our single glazed channel system
46dB when fitted in our double glazed channel system

To put that in context, normal conversation is around 60dB. A 38dB reduction takes a 60dB conversation down to roughly 22dB on the other side, which is barely audible. A 46dB reduction makes loud meetings inaudible from outside the room.

Acoustic laminated glass works well for boardrooms, HR offices, consulting rooms, therapy spaces, and anywhere private conversations need to stay private.

It costs more per square metre than plain toughened, but the uplift over 12mm is modest. If you genuinely need the sound reduction, it's worth it. If you don't, it isn't.

Two important things about acoustic glass

The door has to be framed, not frameless. A frameless glass door has a small gap around it where it pivots. That gap lets sound straight through, which defeats the point of the acoustic glass. So acoustic partitions need a framed door to seal properly.

The door itself is 12mm toughened, not acoustic laminated. Laminated glass has a visible interlayer line around the edges. On a door, where you see the edges every day, that line looks unfinished. So when you order acoustic glass for the partition panels, the door is supplied in 12mm toughened to keep the edges clean. The framed surround around the door is what does the acoustic sealing.

A quick recap

Your situation	Recommended glass
Standard office partition, ceiling under 2500mm	10mm toughened
Tall partition, ceiling 2500–3000mm	12mm toughened
Meeting room, boardroom, or anywhere sound matters	12.8mm acoustic laminated with framed door

The simplest way to get a real price is to use our glass partition calculator. Enter your opening size, choose your glass type, and you'll see the full kit price in seconds. You can order the complete kit straight from the same page. It includes the glass, channels, gaskets, door hardware and delivery.

If you have your own glass supplier and only need the hardware, we sell complete kits without glass too. Next working day delivery for orders placed before 12pm.

Related guides

How much does a glass partition cost? — full UK pricing breakdown
Can I install a glass partition myself? — what's involved if you're fitting it yourself
Can glass partitions be soundproof? — full guide to acoustic options

Need help choosing? Call our advisers on 0800 772 3992 and we'll talk through your project.