What is the cost of replacing a bathtub ?? WHAT DOES IT COST TO REPLACE A BATHTUB?? - Bath Art Refinishing.com Replacing a bathtub is time consuming and messy and usually involves 3 tradesman. Replacing the tub with a new one may involve a tile setter, a plumber and most likely a carpenter to repair unavoidable damage to the sub flooring and surrounding areas. A recent survey estimated the cost between $1,800 and $3,000. You can save up to 70% by having BathArt Refinishing refinish your old tub. - Bath Art Refinishing.com Replacing an existing bathtub with a brand new one can often involve more time and money than one might imagine. Several issues come into play that some people often do not think about when considering bathtub replacement : If the bathroom is small, it may be necessary to remove the toilet, sink, and cabinets before there is room to take the old bathtub out. If the original tub is very old, it may be necessary to replace much of the original plumbing.