ProcBuilder

ProcBuilder is a Blender add-on for procedurally assembling rectangular, box-style buildings from reusable modules.

Build with bottom, middle, top, roof, underground, and balcony modules on an N×N m grid. Select and replace individual blocks, add variations such as balconies, and export the finished building as a clean single mesh in FBX format for Unity and other game engines.

ProcBuilder also includes a separate Tools section for post-processing arbitrary geometry, including parapets and mesh cleanup.