If you’re thinking about choosing a quartz worktop for your kitchen renovation, you might be wondering how thick quartz worktops usually are, and what is the best thickness for your home. 

Our worktop experts have put together this guide with everything you need to know about quartz worktop thicknesses to help you make your decision. 


What thicknesses do quartz worktops come in?

Quartz slabs are generally available in 2 thicknesses. You can choose between a 20mm and a 30mm thick slab. A typical quartz slab size is 3000mm x 1400mm, but this can vary slightly between different manufacturers. 

The thickness of your kitchen worktop will depend on your budget, your kitchen design, the durability you require, and the look you want to achieve. We’ll discuss this in more detail below. 


20mm vs 30mm quartz worktops

When it comes to choosing the perfect worktop thickness for your kitchen or bathroom, there are a couple of different factors you’ll need to consider.

Strength and durability

Although both 20mm and 30mm worktop thicknesses are durable, a 30mm quartz worktop has superior strength and can bear more force. 

Structural stability 

A 30mm quartz countertop offers more structural support than the 20mm thickness. This means a 30mm worktop can support up to 300mm of unsupported material compared to a 20mm worktop, which can only support 250mm. So, a 30mm quartz work surface is the best option if you plan to create a breakfast bar. 


If you’re looking for a high-end, luxurious look, the chunkier appearance of a 30mm worktop will probably work the best. However, if you’re designing a modern kitchen or want a more delicate look, a 20mm worktop might work better. It all depends on the look you want to create in your kitchen or bathroom. 


Although both thicknesses are suitable for kitchen worktops, a 20mm quartz slab can also be used for splashbacks and upstands. This is because it’s thinner and more versatile, so it can be used in various applications. You’ll need to consider where you intend to use your quartz worktop. 

Sinks and hobs

A 30mm quartz worktop offers better support for your sinks and hobs than a 20mm thick worktop. So, if you’re installing a heavy sink or large induction hob, you’ll need to consider this. 


20mm quartz slabs are cheaper than 30mm slabs, so the thinner worktop is a more cost-effective option. So, this might be the best thickness if you want the high-end look of quartz surfaces but you’re on a tight budget. You’ll also be able to use the same slab for your splashbacks and upstands, which can also help save money. 


How to choose the correct thickness

If you want to create a luxurious and elegant look in your kitchen, a 30mm quartz worktop is the best choice. This thickness also offers better durability, structural integrity and strength, so you can install a breakfast bar, a heavy sink and a large induction hob without any problems. Many quartz colours and patterns work better with this thickness as it’s the standard option. 

However, if you want a quartz splashback or upstand, you’ll have to buy a thinner slab for this part of your kitchen, as 30mm slabs are too chunky and will stick out from the wall too much. 

A 20mm quartz countertop might be the better option if your budget is limited. These slabs cost less and can be used throughout your kitchen, including for splashbacks and upstands, helping you save money.


Premium quartz worktops by Mo’s StoneX

Whether you’ve decided on a 20mm or 30mm quartz worktop, it’s guaranteed to make a stunning addition to your home! If you’re looking for a beautiful quartz worktop professionally installed by a team of experts, Mo’s StoneX should be at the top of your list!

We have over a decade of experience supplying, templating, and installing luxury quartz kitchen worktops. You can choose from our wide range of popular quartz colours, so it’s easy to find the perfect fit for your kitchen or bathroom. Whether you opt for a bold, sparkly colour or an elegant marble-inspired pattern, the result is guaranteed to look exceptional. Plus, all our quartz countertops can be customised with your choice of finishes and edging. 

You can rely on our friendly team to guide you through the entire process – we’ll even get you started with a free quote! Fill out our online enquiry form for a free quote, or get in contact with our team if you’re still unsure about the best quartz thickness to opt for.