The petitioning employer files and pays the charges published in the USCIS fee schedule, Form G-1055, including any applicable surcharges and optional premium processing. Where the specialist will work primarily at unrelated worksites, the file needs contractual evidence about control and supervision, and preparing that evidence is the additional cost.
Contract review is the line item people forget
Fee amounts move, so the schedule itself is the only figure worth citing. The predictable additional spending in an offsite case is legal and commercial review of the affiliate’s customer agreements, because those agreements have to say what the petition says. Where they were written by a sales team to close a deal quickly, they frequently describe a technician being made available rather than a system being delivered, and rewriting them properly takes time from more than one department.
There is also the cost of building an evidence set for the specialized knowledge itself, which usually means someone inside the company spending days retrieving records nobody has looked at in years. A request for further evidence on either point is expensive to answer late. Set against that, the cost of a refusal in a plan that has already promised farms a commissioning date is considerably higher.