Ask which filing fees apply to this particular petition, since L filings carry more than one charge and some depend on the size and composition of the employer's workforce. Confirm current amounts against the USCIS fee schedule, and budget separately for the corporate records and accounting work the file requires.
The petition fee is rarely the largest line
Employers usually ask what the filing costs and stop there. The filing charges are real and there can be more than one on an L petition, with some depending on employer characteristics, so they should be confirmed against the current published schedule rather than estimated. Around them sit costs that are easier to underestimate.
Corporate counsel time to produce and, where necessary, correct share registers. Accounting time to reconstruct payroll for the qualifying year and to produce financial statements for the receiving entity. The cost of premises, insurance and payroll for a United States company that must be visibly trading.
Where a case is expedited, that is a further charge. Then there is the cost of getting it wrong: a request for evidence is answered with documents that should have been in the original file, at the price of both professional time and several months of delay against a construction schedule. Ask for an estimate that covers all of it.