Addressing people with titles

When speaking to those holding a particular position in a job (regardless of their status in relation to yours), is it appropriate to address them directly by their title?
For instance, would it be appropriate to call the head chef in a restaurant just 店長, or should I staple a ~さん or ~様 to the end? Or just call them ~屋さん?
Which is the most suitable in such a situation?
Another example would be 社長; do I just use the title, or should I add another honorific or something-or-other?

For me, I attach the ーさん when talking about the person to someone else.
If I’m directly talking to the person, I just call them, 課長、校長、社長。


Thanks for the reply!

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