The government charge depends on the path chosen: a port-of-entry application carries a modest admission fee, while an I-129 petition carries the USCIS filing fee listed on the G-1055 schedule. Professional fees, translations, licence confirmations and travel are additional and vary.
Price the path, then price the evidence
There are two government price points and they belong to different procedures. Applying at the port of entry costs the TN admission fee collected by CBP; filing an I-129 with USCIS costs the petition fee and any optional premium processing, all published on the fee schedule and subject to change. Choose the procedure first, then look up the current figures rather than relying on an amount quoted last year.
Evidence costs come next: certified translations of a French diploma and transcript, a letter of good standing from the professional order, and any credential evaluation the employer's counsel insists on. Ask what each evaluation is for; some are ordered by habit rather than need. Family applications are charged per person.
Keep the employer's contribution and the household's own outlay in separate columns so that a change of employer does not leave the family paying for documents twice.