Table of Contents
- What Silestone Thickness Options are in the UK Market?
- 4mm Vs 12mm Vs 20mm Thick Kitchen Splashback
- So…How Thick Should A Kitchen Splashback Be?
- Does Thickness of a Kitchen Backsplash Actually Affect Strength Or Heat Resistance?
- Thin Quartz Splashback Benefits (That Are Easy To Miss)
- When Going Thicker Actually Makes Sense
- A Small Real-Life Example
- Things To Remember When Installing Kitchen Splashback
- Compared To Tiles Or Glass — Does Thickness Matter More?
- Easy Kitchen Splashback Installation Mistakes People Don’t Think About
- Final Thoughts
- Frequently Asked Questions and Answers
I’ll be honest, when I first heard people talk about Silestone splashback thickness, I thought it was one of those things that doesn’t really matter. Turns out… it does. Not in an overly technical way, but enough that you notice it once everything is fitted. If you’re here searching for splashback for your home, you’re probably stuck between options like 4mm, 12mm, or maybe even 20mm, wondering, does this actually change anything?
We will find out!
What Silestone Thickness Options are in the UK Market?
Most suppliers in the UK will offer three main options:
4mm
12mm
20mm
That’s it. No long list, which sounds simple… until you try to choose. I remember looking at samples and thinking, “These don’t look that different.” But once you imagine them across a full wall, the difference becomes more obvious.
Check Out Silestone Slab Collection
MIAMI WHITE SILESTONE
£451.62
Miami White 17 Silestone is a durable slab that features a bright white surface with no visible patterns and designs. It is very robust, easy to maintain, and does not need any coatings or sealants. Furthermore, it complements any colour… read more
MARENGO SILESTONE
£425.21
Marengo Silestone is a plain grey slab that gives one the sense of uniformity. It is very robust, easy to maintain, and does not need any coatings or sealants. This work surface can blend into any kitchen or bathroom. Every… read more
ARIEL SILESTONE
£470.49
Ariel Silestone has a white base that is entirely covered with thread-like tiny grey veins. As the design is kept the same in all corners, a silestone slab with such design is the essence of uniformity. This slab blends perfectly… read more
4mm Vs 12mm Vs 20mm Thick Kitchen Splashback
Instead of making it sound technical, here’s how I’d describe them after seeing a few kitchens in person:
Thickness | What It Feels Like | Where It Works Best | Small Catch |
4mm | Very slim, almost blends into wall | Clean, modern kitchens | Needs proper backing |
12mm | Feels just right | Pretty much anywhere | Hard to go wrong |
20mm | Chunky, stands out | Bigger kitchens | Can feel a bit heavy visually |
One thing I didn’t expect: 20mm Silestone splashback thickness doesn’t always look “premium”. In a smaller kitchen, it can actually feel a bit too much. Almost like it’s trying too hard. If you’re also weighing up different materials, we’ve written a similar guide on Dekton splashback thickness, which looks at how the options compare in real kitchens.
So…How Thick Should A Kitchen Splashback Be?
If someone forced me to give one answer, I’d say 12mm. And that’s not a lazy answer, it’s just what works most of the time.
Fits both modern and slightly traditional kitchens
Installers are used to it
Doesn’t create design headaches
But then again… if your kitchen is very minimal (flat cabinets, no handles, that sort of thing), 4mm can look really clean. It’s one of those cases where thinner sometimes looks more expensive. Funny how that works.
Does Thickness of a Kitchen Backsplash Actually Affect Strength Or Heat Resistance?
This part confused me a bit at first. You’d think thicker = stronger = better. Right? Not exactly.
Silestone is already quite tough as a material. So:
4mm isn’t “weak”
12mm isn’t magically stronger
20mm isn’t bulletproof
What really matters is how it’s installed. I’ve heard of thinner splashbacks lasting perfectly for years and thicker ones having issues because they weren’t fitted properly.
So yes, thickness plays a role… but it’s not the main thing.
Next Read: Silestone vs Granite
Thin Quartz Splashback Benefits (That Are Easy To Miss)
I didn’t even consider thin splashbacks at first. But after seeing one installed, I sort of got the appeal. With 4mm, you get:
A flatter, more seamless look
Less visual clutter
It almost feels like part of the wall
In smaller kitchens, this slim Silestone splashback thickness can make a noticeable difference. The space just feels… calmer. The only thing is, it needs a proper surface behind it. It’s not something you just stick on any wall and hope for the best.
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When Going Thicker Actually Makes Sense
Now, thicker splashbacks aren’t wrong. They just suit certain setups better.
20mm tends to work if:
Your worktop is also thick
You want that solid, statement look
The kitchen has enough space to carry it
I once saw a large open-plan kitchen where everything was chunky: worktop, island, and splashback. It worked there.
Would it work in a compact kitchen? Probably not.
KENSHO SILESTONE
£502.86
Kensho Silestone is an almost nonporous, stain-resistant slab ideal for kitchen worktops, splashbacks, bathroom vanities and shower claddings. Its plain grey base creates a calming outlook, while its durability ensures a long lasting aesthetic. This grey slab does not require… read more
POBLENOU SILESTONE
£552.97
Poblenou Silestone has a grey base which looks stunning in residential and commercial properties. The surface shows hints of white in between the stone slab, placed randomly. Our consumers have always been wowed by the beauty of silestone slabs. They… read more
CORAL CLAY SILESTONE
£354.73
Coral Clay Colour Silestone has a brownish-cream base which features shiny, and flaky whites scattered all above the surface. This slab gives one the essence of uniformity as the design is similar in all corners of the slab. The brown… read more
A Small Real-Life Example
A friend of mine recently redid their kitchen (nothing fancy, just a clean upgrade). They were set on going thick — 20mm — because they thought it would feel “luxury”. The installer gently pushed them towards 12mm instead. End result? Looked better than expected. Not bulky, not too thin… just balanced. Funny thing is, if they had gone with 20mm, it might’ve made the space feel tighter.
Things To Remember When Installing Kitchen Splashback
This is where it gets practical.
Silestone splashback thickness affects more than just looks:
Heavier slabs = more wall support needed
Cutting around plug sockets gets trickier
Costs go up with thickness
Installation can take slightly longer
It’s not dramatic, but it adds up.
If you’re already stretching your budget, this is worth thinking about.
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Compared To Tiles Or Glass — Does Thickness Matter More?
A bit, yes. With tiles, thickness isn’t something you really notice because of grout lines. With glass, everything is already quite slim. But with Silestone:
Thicker = more solid feel
Thinner = more seamless finish
Even at 4mm, it usually feels more “premium” than tiles just because of that smooth, continuous surface.
Easy Kitchen Splashback Installation Mistakes People Don’t Think About
Not a long list, just a few honest ones:
Picking thickness without thinking about kitchen size
Assuming thicker automatically looks better
Ignoring installer suggestions
Not planning for sockets and cut-outs
Choosing based only on what looks good in a sample
That last one… easy trap to fall into.
Next Read: Most Durable Kitchen Worktops for Everyday Use
Final Thoughts
If I had to keep it simple… Most people won’t regret choosing a 12mm Silestone splashback thickness. It’s the safe middle ground. But if you’re after a cleaner, more modern look, thinner can surprise you in a good way. And thicker? It works, just not everywhere. A kitchen splashback is something that, once installed, becomes one of those details we notice every single day.
Here is our Silestone Collection for you to choose from.
And 10+ surface options in case you are still exploring options.
Dial 0330 113 5868 to discuss in detail.
Frequently Asked Questions and Answers
Is A 4mm Splashback A Bad Idea?
We have installed 4mm kitchen backsplashes in ultra-modern homes. You need expert stone installers who have great experience in handling them and provide good support.
Is 20mm Too Thick For A Splashback?
I wouldn't say so. It is one of the popular thicknesses when it comes to natural stones, but the final choice depends on where you are installing it – is it for a modern kitchen or a classic one? – and other factors. Let's chat – call us on 0330 113 5868.
What Is The Most Popular Silestone Splashback Thickness In The UK?
For marble and granite it is 20mm but with Silestone it has to be the 12mm thick ones.
Does Thickness Make A Big Difference In Cost?
It does increase the cost, especially when you include installation. Thicker usually means more material and more effort.
Should Splashback Thickness Match The Worktop?
You can match it, but you don’t have to. Mixing thickness can actually look more interesting.
