When pricing porcelain dental veneers, there are many factors, including current condition of teeth (gum disease? Root canals? Broken?), number of teeth involved (4 teeth vs 20?), material used, lab used (some just stain for color variation, some layer different colors of porcelain) and many more.
Most experienced cosmetic dentists do not quote a fee per tooth and opt for a case fee. The average 10 tooth veneer case will run from $13,000 to 20,000, which will include all initial lab work, photographs, study models and so forth.
If you only have a single tooth to veneer, the fee will be about the same as a single crown, whatever the going rate in your city is.