Don't forget about this often-overlooked feature: an appropriately sized bathroom exhaust fan. Without proper ventilation, humidity gets trapped in the enclosed space. Over time, this moist environment becomes the perfect home for mold and mildew, and allows paint, grout, and metal to deteriorate. Whether you already have a fan or add one in your renovation, make sure to vacuum the vent clean of construction dust and debris before switching the fan on in your updated space.
Related: How To - Choose an Exhaust Fan