What Depth Tile Trim Do I Need? The Complete Tile Trim Depth Guide
21/08/2026
Choosing the correct tile trim is one of the most important decisions you'll make before starting any tiling project. Whether you're installing bathroom wall tiles, a kitchen splashback, or porcelain floor tiles, selecting the right tile trim depth ensures a professional finish, protects exposed tile edges, and prevents costly installation mistakes.
This comprehensive tile trim depth guide explains everything you need to know so you can confidently select the right trim for your project.
Why Does Tile Trim Depth Matter?
The primary purpose of tile trim is to protect the exposed edges of your tiles while creating a clean, decorative finish. However, choosing the wrong tile trim depth can lead to several problems:
The trim sits lower than the tile edge.
The trim protrudes above the tile surface.
Tile edges remain vulnerable to chips and cracks.
The finished installation looks uneven.
Using the correct tile trim depth ensures your tiles sit neatly against the profile, creating the sleek finish every tiler aims for.
What Depth Tile Trim Do I Need?
Your tile trim should usually be slightly deeper than the thickness of your tile.
This extra depth allows room for the tile adhesive beneath the tile, ensuring the tile sits flush with the trim after installation. As a general rule:
1mm–1.5mm larger than the tile thickness for wall tiles
1.5mm–2mm larger than the tile thickness for floor tiles
Top Tips
Measure your tile thickness using a tape measure.
Add 1.5mm to 2.5mm for the tile adhesive bed underneath.
Always select a trim depth that finishes flush or slightly under the glazed face of the tile; never let the trim sit higher (proud) than the tile surface. If you are caught between two sizes, round up to the next available trim size.
Common Tile Thickness to Trim Depth Conversions
6mm tiles (thin wall/ceramic): Use an 8mm trim depth.
8mm tiles (standard wall/floor): Use a 10mm trim depth.
10mm tiles (thick porcelain): Use a 12mm or 12.5mm trim depth.
12mm+ tiles (natural stone/large format): Use a 12.5mm to 15mm trim depth.
Tile Trim Depth Guide by Tile Thickness
This tile trim depth guide provides a useful starting point for selecting the correct trim.
Tile Thickness | Recommended Tile Trim Depth |
4mm | 5mm–6mm |
6mm | 7mm–8mm |
8mm | 9mm–10mm |
9mm | 10mm–11mm |
10mm | 11mm–12mm |
12mm | 13mm–14mm |
15mm | 16mm–17mm |
20mm | 22mm |
Remember that this tile trim depth guide should always be used alongside your tile adhesive manufacturer's recommendations. Make sure you check the datasheet of your chosen adhesive for all up-to-date information.
How to Measure Tile Trim Depth
One of the easiest ways to determine the correct tile trim depth is by following these steps:
Measure your tile thickness using a tape measure.
Consider the adhesive bed thickness.
Add approximately 1–2mm depending on whether you're tiling a wall or floor.
Select the closest available trim size.
Popular Tile Trim Sizes
Explore a wide range of trim sizes suitable for almost every project, including:
Alongside different depths, you'll also find a wide variety of finishes and profiles, including round edge, square edge, straight edge and angle trims to suit every design style.
At Premium Tile Trim, you'll find an extensive range of high-quality tile trims in multiple depths, materials and finishes to suit every project. With expert advice and one of the UK's widest selections of tile trims, choosing the right tile trim depth has never been easier.