Clarify why it is needed and what question it would address. Do not assume every L-1B case requires the same evaluation merely because another visa category did.
Match preparation expense to the actual requirements
Separate credential work from the knowledge explanation, professional review and current official fees. Buying an evaluation does not create specialized knowledge or guarantee that the blanket professional condition is met. Ask precisely what legal requirement, if any, a credential evaluation would satisfy for this particular case, since that kind of report answers an academic-equivalency question that may have little to do with a claim built on knowledge of the organization's own processes.
Compare its cost against an alternative such as a detailed account of the employee's work history and internal training, which can sometimes address the real question more directly and at lower cost. Confirm that any evaluator's engagement is scoped for immigration use specifically, rather than only for academic or professional-licensing purposes, since a report written for the wrong audience may need to be redone entirely. Buying the evaluation before answering these questions risks paying twice: once for a report that does not fit the case, and again for the work that actually does.
Ask the immigration adviser to confirm in writing whether the specific requirement at issue can instead be met through a detailed description of the employee's role, since that alternative sometimes removes the need for any outside evaluation at all.