Choosing the Right Thickness

Neolith is produced in several thicknesses, each suited to different applications. For kitchen worktops, the two main choices are 12mm and 20mm. Neolith’s countertop technical manual also lists laminated combinations such as 6+6mm, where thinner layers are bonded to build up thickness. Thinner 3mm and 6mm formats are mainly used for furniture, wall cladding, flooring and facades.

The thickness you choose affects the look of your kitchen, the strength of the worktop, how far it can overhang, its weight and its cost. There is no single right answer. The best choice depends on your kitchen style, layout and budget.

This guide compares the thickness options using Neolith’s published data so you can decide with confidence.

All Neolith Thickness Options

Weights are taken from Neolith’s countertop technical manual. Neolith’s thickness guidance recommends 3mm for furniture and interior tiling, 6mm for flooring and exterior tiling such as ventilated facades and 12mm for demanding applications such as kitchen worktops.

12mm vs 20mm at a Glance

Overhang figures are taken from Neolith’s countertop technical manual and depend on the exact layout and whether a cut out is nearby. Your fabricator will confirm the right approach for your design.

To explore the Neolith designs we supply and fit, visit our Neolith Worktops page for homeowners across Bedford and the surrounding counties.

The Case for 12mm

A 12mm Neolith worktop has a slim, refined profile that suits modern, minimalist and handleless kitchens. It is lighter, which can make installation easier. It also generally costs less than 20mm. When fully supported by the cabinets beneath, it is more than strong enough for everyday kitchen use.

The main limitations are overhangs and edge vulnerability. Unsupported overhangs are shorter than with 20mm, so breakfast bars may need brackets or supports. A slim edge also offers less material to absorb impacts, so an eased edge profile is worth considering.

The Case for 20mm

A 20mm worktop feels solid and substantial. It suits classic, shaker and transitional kitchens and gives more flexibility for islands with seating. Neolith’s technical data shows a breaking strength roughly three times that of 12mm. Its manual also allows longer unsupported overhangs.

It is heavier and generally costs more, both in material and fabrication time. Neolith’s 2024 silica free formulations were also launched first in 20mm, starting with Arctic White and Abu Dhabi White, which may influence your choice if silica content is a priority.

Creating a Thicker Look With Mitred Edges

If you want the appearance of a very thick worktop, such as 40mm or more, the edge can be built up by mitring a strip of Neolith to the front edge. This creates a bold, architectural look without the weight of a solid thick slab. Full Body designs work especially well for mitres because the colour and veining continue through the material.

Mitred edges require precise fabrication and add to the cost, so they are often reserved for islands and feature areas where they make the biggest visual impact.

Support and Installation

Whatever the thickness, proper support is essential. Neolith’s manual recommends a continuous supporting surface over kitchen furniture for straight edged worktops and reinforcement around the perimeter for mitred edges. Joins need additional support and cut out corners must be radiused with a minimum radius of 3mm, never left at 90 degrees.

At Precious Marble our team follows manufacturer guidance on support, cut outs and overhangs, so your worktop performs as it should for years to come. We also check cabinet levels before fitting, since even small variations can create stress points.

How Thickness Affects Cost

Thickness influences both material and labour costs. A 20mm slab contains more material and takes longer to cut and finish. Mitred edges add further labour and material. For many kitchens, choosing 12mm for perimeter runs and 20mm or a mitred edge for the island balances cost and impact beautifully.

Mixing thicknesses in one kitchen works well when planned carefully. The difference is most noticeable where two surfaces meet, so your designer will usually keep each thickness to a separate area such as the island and the back wall.

Thickness for Other Areas of the Home

Thickness choices extend beyond the main worktop. Splashbacks and upstands are often made from thinner material, which keeps weight down on walls and gives a neat finish behind the worktop. Bathroom vanities commonly use 12mm for a clean, modern profile, while shower walls and wall cladding use thinner formats that are easier to fix to vertical surfaces.

Furniture such as dining tables and coffee tables often uses thin Neolith bonded to a supporting base, which keeps the piece light enough to move while delivering the same heat and stain resistance as a worktop. Outdoor kitchens typically use 12mm or 20mm depending on the design and support available.

Questions to Ask Before Deciding

Before settling on a thickness, ask your fabricator how the choice affects overhangs in your layout, whether the design you like is available in both options and how the edge will look. Ask whether a mitred edge would suit your island and how the cost compares with a solid 20mm slab. These questions quickly clarify which option gives you the best result for your budget.

Explore Related Guides

Thickness and format go together, so read Neolith Slab Sizes and Lengths to see which slab sizes are available. For a full breakdown of how thickness affects your budget, our guide Neolith Worktops Cost UK sets out typical prices.

Edge durability varies with thickness and profile, which we explore in Does Neolith Chip or Scratch.

For answers on every aspect of choosing Neolith, the Neolith Worktops Guide brings all of our articles together in one place.

See the Difference in Person

The best way to choose a thickness is to see and feel the options. Visit our 200 square metre showroom in Elstow to compare 12mm, 20mm and mitred edge samples and talk through your kitchen layout.

Call us on 01234 348 590 or request a quote online and we will provide a clear, fixed price with 0% finance available.