The bathroom was the part Mark took most seriously. A treehouse home might sound playful, but plumbing, moisture, and hygiene leave no room for guesswork. He hired a local plumber for the connections and spent weeks making sure the walls were sealed properly before he installed anything permanent. It was the one area where he refused to improvise.
The finished bathroom is narrow but bright. It has a compact shower, a small composting toilet approved for the setup, a corner sink, and a high window that opens for ventilation. White wall panels make it easy to clean, while a slatted wooden mat keeps the floor from feeling cold after showers. A small shelf holds towels and nothing more, keeping the space calm. He also fitted a proper latch, because privacy mattered in a tiny home.
Mark saved money on almost every visible surface, but not on waterproofing. He knew one leak could ruin the whole house, especially in a structure raised above the ground. That choice is what makes the bathroom feel believable. It is not a spa, and it is not pretending to be one. It is simple, dry, warm, and built to last.