See photo. 6.5 x 5.5 ft. space. Not shown is a chair to sit down on in front of the enlarger, plastic to protect the vanity from chemicals, Delta red safelight bulb (in regular light socket), and a Time-O-lite timer and footswitch. A paper safe is placed beneath the chair. Of course the window had to be blocked. I use the darkroom only at night.
Developer is on the toilet, stop bath and fixer on the sink, and water in the tray on the hamper (all 11x14 trays). I can't use the bathroom sink to wash because of the trays so when the print goes in the water tray, I leave the darkroom and wash the print in the kitchen sink. This works well, I've been using this setup for years but I am thinking of building a darkroom in the basement.