Thickness changes how a worktop looks far more than most people expect. Here is how to choose between 20mm and 30mm quartz.
20mm: sleek and modern
20mm is our standard and what most of our London kitchens use. It gives a slim, crisp edge that suits handleless and contemporary kitchens, and it is the most cost-effective option. It is plenty strong for kitchen worktops, splashbacks and islands. We do not offer 12mm quartz.
30mm: chunky and substantial
30mm gives a heavier, more traditional look. It suits Shaker and classic kitchens, and large islands where you want the stone to feel solid. It costs more because each slab contains more material.
Things to check
- Printed quartz is 20mm only. Stones such as Golden Thunder and Summer Daze come in 20mm.
- Waterfall ends look great in either thickness, because the mitred edge hides the thickness.
- Matching splashbacks and upstands are usually cut in 20mm, whichever worktop thickness you choose.
How thickness changes the look
Thickness affects proportion. A 20mm edge looks light and precise, which suits slim handleless doors and modern appliances. A 30mm edge reads as solid and generous, which balances heavier framed or Shaker doors. On a large island, 30mm can stop the top looking thin against a big expanse of cabinetry, while on a compact kitchen 20mm keeps things feeling airy.
Edge profiles
Most of our clients choose a simple eased or slightly rounded square edge, which suits both thicknesses. 30mm also takes chamfers and bevels well. A mitred edge can make 20mm look thicker on an island without the cost of a full 30mm slab, which is a useful trick when only the island needs to look chunky.
Weight and support
30mm stone is heavier, so base units need to be sound and level, and large overhangs need proper support. We check this at templating and will tell you if any supports are needed for breakfast bar overhangs.
Splashbacks and upstands
Splashbacks and upstands are normally cut in 20mm, even when the worktop is 30mm, because they do not need the extra thickness and it keeps them neat against the wall.
Our advice
If in doubt, choose 20mm. It is the modern standard, suits most kitchens and keeps the cost down. Choose 30mm if you want a traditional look or a statement island.
In short
- 20mm: slim, modern, our standard and the best value.
- 30mm: chunkier and more traditional, costs more.
- Printed quartz is 20mm only.
Frequently asked questions
Is 20mm quartz strong enough?
Yes. 20mm quartz is strong enough for kitchen worktops and islands when supported correctly.
Is 30mm quartz more expensive?
Yes, because each slab contains more stone.
Do you do 12mm quartz?
No. We fit 20mm as standard, and 30mm on request.