a cold water knob a counter face 204 also known as a valance is connected to a front edge of the countertop 203 the counter face 204 hides plumbing and the side units 100 from sight a lip 207 is disposed along a rear edge of the main body 200 the lip 207 abuts the rear wall of the stall the width of the main body 200 is approximately the same width or slightly narrower than the narrowest possible stall in which the adjustable width vanity is to be installed by sizing the width of the main body 200 in this way the adjustable width vanity can be guaranteed to fit in any stall furthermore by matching the width of the stall the amount of the side units 100 that is visible is minimized the shelf assembly 300 is an optional addition to the adjustable width vanity the shelf assembly 300 includes a plurality of shelves 301 the shelves rest on respective shelf frames 302 the shelf assembly 300 has shelf upper legs 303 and shelf lower legs 304 telescoping feet 305 telescope into the shelf lower legs 304 and allow the height of the legs to be adjustable fig7 shows the side unit 100 in detail the side unit includes a support top 104 a.