PrefabKit

PrefabKit adds prefabs to the Unreal Editor. Select actors, click Create Prefab, and the selection becomes a prefab asset with a thumbnail. Drop the asset into any level as often as you like, nest prefabs inside other prefabs, edit one instance and save it back to the asset - every other instance in the level picks up the change.

Prefab collections hold weighted lists of prefabs. A prefab actor that points at a collection picks one entry from its seed, so a single placed actor can become a different building, prop cluster or room every time you press Randomize. A Randomizer actor re-rolls the whole level (or a chosen list of prefabs) in the editor or at runtime, spread over several frames, and Seed Linker actors keep groups of prefabs on the same roll.

At runtime, Blueprint nodes spawn, randomize, re-assign and unlink prefabs. The optional construction system turns a Player Controller into a builder: a ghost cursor with snap points for floors, walls and objects, build and remove tools, a ready-made build menu widget, and save/load of player-built levels to a save slot.

PrefabKit is part of the Alpha XP utilities collection for Unreal Engine 4.27 and 5.8. Every feature is exposed to Blueprints and C++, it ships with styled HTML documentation, and it is compiled and verified warning-free against clean UE 4.27 and UE 5.8 projects.

Key features

• Create Prefab from the current selection (toolbar button or viewport right-click menu)
• Prefab assets with automatic thumbnails, placeable by drag and drop
• Nested prefabs: prefabs can contain other prefabs
• Save Prefab to Asset updates every other instance in the level (can be switched off)
• Prefab collections: weighted random variations chosen from a per-actor seed
• Randomizer actor that re-rolls all or selected prefabs, spread over frames, with a
• Seed Linker actors that keep several prefabs on the same variation
• Blueprint nodes: Spawn Prefab, Randomize Prefab, Set Prefab Asset, Unlink Prefab, Find
• Event Listener class per prefab asset that runs after a prefab and its children are
• Runtime construction system: ghost cursor, floor/wall/object snap points, build and
• Ready-made build menu widget and data asset for categories of placeable prefabs
• Save and load player-built levels to a save slot, including the player's position

Blueprint & C++ API

The API is organised into these entry points:

Callable runs when executed · Pure no exec pin, returns a value

Construction 13

PrefabKit 12

Events & delegates

Bind these in Blueprint (drag off the object → Bind Event) or with AddDynamic in C++.

Options & enums

Compatibility

One ready-made build per engine version is included in the download — copy the one that matches your project.

Technical details

What's in the download

Quick start

1. Unzip the download and pick the build that matches your engine (4.27 · 5.8).
2. Copy the PrefabKit folder into your project's Plugins/ folder (create it if needed).
3. Open the project, enable PrefabKit under Edit › Plugins and restart the editor.
4. Right-click in any Blueprint graph and search Construction — or include the public headers from C++.
5. Package for your target platform (Windows).

Good to know