26.3 Slab and Stair Backport
by Tectre
26.3 Slab and Stair Backport adds stairs and slabs to Minecraft 1.21.1 on Fabric, bringing back block shapes for that version.
What it does
Stair and slab blocks are added to the 1.21.1 game, so builders on that version can place block shapes that are otherwise not available there. The mod is a Fabric mod and is published only for 1.21.1, with the latest file, 1.1, dated 2026-08-06. Servers that run it need every player to install it too. The code is not open source and is covered by All rights reserved.
Key features
Backported stairs
Stair blocks are added to 1.21.1 so they can be placed in builds on that version.
Backported slabs
Slab blocks are added alongside the stairs, for matching flat and half-height edges.
Wool and concrete variants
The mod's blocks are added for wool and concrete, letting builders mix the new pieces with existing color palettes.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Wool Stairs and Slabs Early is a Fabric mod for 1.21.8 – 26.1.2 under All rights reserved, so it targets newer builds than this one. Vanilla+ Verticals also runs on Fabric for 1.21.1 – 1.21.10 but is released under the Creative Commons Attribution Non Commercial 4.0 license. More Block Variations (Vertical Slabs) is open source under the MIT License and targets 1.21.3 only.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| 26.3 Slab and Stair Backport | Fabric | 1.21.1 | Client and server | 2026-08-06 |
| Wool Stairs and Slabs Early | Fabric | 1.21.8 – 26.1.2 | Client and server | 2026-06-04 |
| Vanilla+ Verticals | Fabric | 1.21.1 – 1.21.10 | Client and server | 2025-10-20 |
| More Block Variations (Vertical Slabs) | Fabric | 1.21.3 | Client and server | 2024-11-16 |
Questions
Does 26.3 Slab and Stair Backport need to be installed on the server?
In the catalog
26.3 Slab and Stair Backport is one of 12,078 Decoration mods on ModsFinder, and one of 6,982 Decoration mods for Fabric. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
A quick mod I popped together for my Fabric Cobblemon server, as there were no 1.21.1 Fabric backports for wool or concrete stairs and slabs.
Official listing
- Modrinth page
- modrinth.com/mod/26.3-slab-stair-backport
- Owner
- Tectre
- Published
- 2026-08-03
- Updated on Modrinth
- 2026-08-06
- Facts verified
- 2026-10-15
