Pasadena, CA - Complete Bathroom Addition to an Existing House For this Master Bathroom Addition to an Existing Home, we first framed out the home extension, and established a water line for Bathroom. Following the framing process, we then installed the drywall, insulation, windows and rough plumbing and rough electrical. After the room had been established, we then installed all of the tile; shower enclosure, backsplash and flooring. Upon the finishing of the tile installation, we then installed all of the sliding barn door, all fixtures, vanity, toilet, lighting and all other needed requirements per the Bathroom Addition.