There is no one definitive answer to this question. Rather, the cost of having a plumber install a tub will vary depending on a number of factors, including where you live, the specific brand and model of tub that you select, and the level of plumbing experience and expertise that your chosen plumber brings to the job. That said, as a general rule of thumb, you can expect to pay somewhere in the range of $200 - $500 for installation of an average-sized tub. Keep in mind, however, that this is just a ballpark figure and that prices may vary significantly depending on the aforementioned factors. So it's always best to get quotes from multiple plumbers before making your final decision.

Generally, a plumber will charge around $75 to $150 to install a tub, depending on the complexity of the job. However, it's always best to get a few quotes before hiring someone to do the work.