Tiles & flooring· 3 min read
Diagonal Tile Layout: How Many Extra Tiles and When It’s Worth It
A 1.2 × 3 m hallway and a 5 × 4 m room with 30 × 30 and 60 × 60 cm tiles: how many extra tiles a diagonal layout costs and why the gap grows with tile size.
Tiles turned 45° look livelier, but every tile along the walls has to be cut. How many more tiles does that cost? “Always 15 % more” doesn’t hold — the difference depends on how big the tile is compared with the room. We’ll show it on a narrow hallway and a larger room.
The comparison
All examples use a 3 mm joint. The numbers are tiles in the layout, with a 10 % reserve in brackets.
| Area and tile | By area | Straight from a corner | Straight from the centre | Diagonal from the centre |
|---|---|---|---|---|
| Hallway 1.2 × 3 m, 30 × 30 cm | 40 | 40 (44) | 55 (61) | 53 (59) |
| Hallway 1.2 × 3 m, 60 × 60 cm | 10 | 10 (11) | 15 (17) | 19 (21) |
| Room 5 × 4 m, 60 × 60 cm | 56 | 63 (70) | 63 (70) | 71 (79) |
| Room 5 × 4 m, 30 × 30 cm | 218 | 238 (262) | 255 (281) | 259 (285) |
What the table shows
- Small tiles in a narrow hallway — a centred diagonal needs 53 tiles, a centred straight lay 55. If you want the hallway symmetrical anyway, the diagonal costs nothing extra in material; compared with a corner start, though, it is 13 tiles more.
- Large tiles in a narrow hallway — here the diagonal nearly doubles the order: 19 tiles instead of 10, and 16 of them are cut. 60 × 60 cm tiles in a 1.2 m wide hallway is the most expensive combination.
- A larger room — with 60 × 60 cm tiles the diagonal costs 8 tiles more than a straight lay; with 30 × 30 cm tiles only 4 more than a centred straight lay.
The rule: the larger the tile relative to the room, the more expensive the diagonal. With small tiles over a large area the difference is small; with large tiles in a small room it can be double.
Tiles & flooringCompare straight and diagonal layoutsWatch the centred straight lay too
A centred straight lay is not automatically neat. In the 5 × 4 m room with 30 × 30 cm tiles it leaves strips only 29 mm wide along two walls — almost impossible to cut. From a corner the narrowest strip is 61 mm. A diagonal has no such strips; its edge is made of triangles of different sizes. So when you compare straight and diagonal, look not only at the tile count but also at how thin the cuts are that the calculator shows.
In the 1.2 × 3 m hallway with 30 × 30 cm tiles, a straight lay from a corner matches the area count exactly (40), because the 291 and 273 mm strips are nearly whole tiles. A hallway a few centimetres narrower would change that — so always enter your exact dimensions.
More tiles also means more work
With a diagonal almost every edge piece is a triangle or a trapezoid that has to be measured and cut at an angle. In the 5 × 4 m room with 60 × 60 cm tiles, a centred diagonal has 40 cut pieces, a centred straight lay 28. If a tiler does the job, more cuts mean more hours.
When a diagonal is worth it
- When the tiles are small and you want a symmetrical room anyway — the difference from a centred straight lay tends to be small.
- When the look matters and you are happy to pay in tiles and time. Compare the exact numbers for your room in the calculator first.
- With large tiles in a small room, consider a straight or offset layout — you save both tiles and cuts.
Workshop tips
- For a diagonal, first mark two perpendicular lines through the centre of the room and set out the 45° line from them.
- Base the reserve on the layout count, not the area — the table shows how far apart they are.
- If you don’t like the triangles at the wall, try a straight border of whole tiles around the diagonal and count both parts separately.