You should be able to validate whatever the client wants assuming you have a strong grasp of it, however, if you were hired to modify a client's existing website that was poorly coded you might encounter a situation where the website will not validate yet still work and the client might be satisfied with it as they might not care about the validation at all as long as the page renders since they probably don't want to pay extra for you to fix their previous coder's sloppy code.
If presented with such a scenario then you should explain to the client the importance of validation and if they are still not convinced, then simply leave it how it is as long as it works for the time being as that's what you're getting paid for, just make sure that the client is aware that you're not responsible for any conflicts with future browsers due to the lack of proper code.
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