The term 'Bathroom Installation' refers to the process of installing a bathroom in a home or other building. The crossword solutions for this term include SPA, which stands for 'Specialty Plumbing Appliances'. This refers to the various plumbing fixtures and appliances that are used in a bathroom, such as toilets, sinks, showers, and bathtubs. These items must be installed correctly in order for the bathroom to function properly.