There is no simple answer to that question, it depends on what you consider a quote to be. If it involves fault diagnosis or labour to provide the quote, i.e. removing bath panels or similar, in order to find out where the problem is, it is fair to expect a cost. In saying that the Tradesperson should inform you of this before they attempt to carryout any of the work & ensure they have your concent, & at no point are you under any obligation to pay for anything that has not been agreed in advance. Nore are you under any obligation to accept any quote. I hope this has been of help.