If your job requires materials, parts, permits, parking, etc., your Pro will advise you in advance to get approval or to not proceed. If approved, these costs will show up on your invoice in the 'Additional Costs' line item.

If your job required additional labour (say, for a heavy mirror to be hung), your Pro will also advise you in advance to get approval or to not proceed, but this additional cost will show up in the 'labour' line item on the receipt.