You don't need to do a full bathroom renovation to completely change the look of the space. Instead, a new bathroom vanity can give you the fresh update you're looking for — as well as all of the extra storage space you've been lacking. A single-sink vanity can cost as little as $50 to $150, but the average cost is more likely to be in the range of $200 to $800. A custom vanity with multiple sinks can cost up to $1,500.