Where your objection relies on a subjective-public right, it can carry weight in the building procedure.
As a neighbour within the relevant range you can raise objections in the permit-required procedure under the Salzburg Building Police Act (Salzburger Baupolizeigesetz). These are only enforceable, however, in so far as they concern a subjective-public right, above all setbacks, building height and protection from impermissible immissions. You cannot rely on a pleasant view or a feared reduction in value.
What is decisive is that you raise your objections in time and preferably in writing. Have it checked which of your concerns relate to a subjective-public right and how to assert them effectively in the procedure.