If your bathroom fixtures are more than 15 years old, the first renovation you should undertake is an upgrade in performance and water efficiency by installing WaterSense-labeled fixtures [1]. Switching in a new water-saving faucet allows you to re-accessorize the room while reducing water flow by at least 30 percent without a downgrade in performance. Smarter showerheads provide spa-style amenities while using less than 2.0 gallons of water per minute. And high-efficiency toilets (HETs) are now the norm in up-to-date, resource-conscious homes, conserving more than 4,000 gallons of water per year. If you make any or all of these green bathroom renovations, highlight them in home listings and open house materials so that shoppers know they're looking at lower utility bills as well as new fixtures.
Links:
[1] http://www.moneypit.com/article/watersense-labeled-products-lower-water-bills