Modular Builder is a Godot editor plugin for creating modular buildings directly in your 3D scenes. Create square and triangular foundations, place walls by connecting vertices, and add square or triangular floors. Snap points help align pieces, and walls spanning multiple foundations are split at intermediate vertices. Add windows and doors to walls, or hatches to foundations and floors. Details can be created as openings or as separate editable objects. Generate a general concave collision shape for a structure and save or insert reusable building modules. The plugin is designed for Godot 4.7 and later. Measurements are shown in meters. Licensed under CC0 1.0 Universal.