Clarify the relevant evidence and translation requirements before commissioning broad work. The answer depends on the documents actually needed. Ask whose decision creates each cost. The employer decides how much of a technical corpus is reviewed and redacted, which is where translation bills grow; the applicant decides how much personal record-gathering to delegate. Neither should commission bulk work before counsel has said which facts need proving. Volume is the easiest thing to buy and the least likely to help.
Budget for the evidentiary purpose
Ask which facts the material would establish and whether the quoted review includes technical documents. Separate professional work, translation and official charges. Document volume does not guarantee a stronger claim or approval.
Cost follows evidentiary purpose, not page count. Translating a full procedure manual to establish a point two supervisor letters would settle is money spent on the wrong instrument. Ask counsel to name the propositions the file must support, then price only the documents that support them.
Confirm whether a quoted review covers technical material, since specialized documents often sit outside a standard scope and reappear as a separate invoice. Where an outside vendor holds part of the record, find out early whether retrieval is charged. Government charges change independently of any case, so confirm current figures from the official source rather than from a previous year's budget.