Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the bathroom_generator zip.

Usage

1. Open the Bathroom tab in the 3D viewport sidebar (N). With nothing selected, click the picture to choose one of the 113 designs, or browse the families (Rooms, Bathtubs, Toilets, Sinks, Showers, Mirrors, Rails, Tiles), and add it at the 3D cursor. You can also use Shift+A, Mesh, Bathroom.
2. Select a design to edit it. The card at the top shows its picture, size and face count. Surprise makes a new design of the same kind, Vary changes the current one a little, the palette button picks random materials and the arrow resets the design.
3. Rooms show one icon tab per part: Room (layout, size, window), Tiles, Bathtub, Shower, Toilet, Sink, Mirror and Towel Rail.
4. Materials holds every finish; Detail & Output holds the detail level, the seed, Convert to Mesh and Delete.