# New Block Kit layout block

By Steven Van · 2026-10-29

Developers can place section, image, actions and table blocks side by side in one grid, and older Slack clients show fallback blocks.

Slack has added a [layout block](<https://docs.slack.dev/block-kit/>) to Block Kit. It arranges other blocks into a grid of rows and side-by-side items, so a single message or view can show multi-column content instead of one vertical stack.

## What it is for

Slack points to summaries, detail panes and metric strips, anywhere a column of stacked blocks would waste horizontal space. Related fields can sit next to each other instead of being stacked, which Slack says makes output denser and easier to scan.

## How it works

- **Existing blocks drop in.** Section, image, actions, table and other blocks can go inside a layout item with no changes.

- **Layout hints.** Items are declared as narrow, standard or wide, and Slack handles the rest rather than requiring pixel measurements.

- **Self-contained.** The grid lives entirely inside one block, so reordering the parent blocks array won't break it.

- **Fallback.** Older clients render the fallback blocks you supply.

The linked Block Kit overview does not cover the layout block's JSON fields. It describes blocks as the components stacked in a blocks array, with up to 50 blocks per message and 100 in modals or Home tabs.

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Sources

[Original source](<https://docs.slack.dev/changelog/2026/10/29/block-kit-layout-block>)

[Read New Block Kit layout block on Creators Toolbox](<https://creatorstoolbox.com/blog/slack-new-block-kit-layout-block>)

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Canonical source: https://creatorstoolbox.com/blog/slack-new-block-kit-layout-block