Bidets come at an average cost of $1090. However, depending on the model, some could cost as much as $2500 or as low as $400. Different designs have different features, and this can affect the total cost. As such, you'll have to analyze and compare to get the perfect bidet that serves your needs. In addition to this, you'll have to consider the plumbing costs that are common with installations. While installing bidet toilet seats is much simpler and cheaper, installing stand-alone bidets may be more expensive depending on how much plumbing needs to be done. The national average plumbing cost for installing bidets is $1000; however, it could be as high as $2500 or as low as $400. In addition, note that if you aren't DIYer, then there is a possibility that you may need an electrician's services. The electrician will help install an electrical outlet in case you want to install an electrical bidet. Add all these charges, and you'll have gotten your answer on how much bidets cost and how much you'll need during installations.