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Normally it should be vous avez besoin de ... , monsieur.
But is it possible to say tu as besoin de ... , monsieur in any context without being rude to the other person or without being considered uneducated? Does it make a difference for 'madame' or 'mademoiselle' ?
It is not acceptable at all. Those civility titles imply respect, distance and always a minimum of formality ; the use of the second person singular, which reflects always a certain degree of familiarity with which the two persons treat one another, is incompatible with the terms of address "madame", "mademoiselle" and "monsieur".
However, someone unaware of this fact can safely err and use the second person singular as well as one of those terms; there is nothing rude implied, no insult; people usually understand that the person given to such usage has not yet become conscious of this convention. The failure to abide by this principle is characteristic only of people of origin other than French.
