The machine work should be billed out separately, in my opinion. I can see where the advice comes from, and there is logic in it, but there also logic in billing for it, especially on a square footage bid. If it was a full job bid, then yeah, the machine is part of the job. But by the foot is basically t&m but not as unprofessional looking. That machine is time, and time is money, let alone maintenance, rental fees, or paying someone with a big ass trailer to transport it. I would charge for it. But I’m not you. I know you feel you should, or you wouldn’t be asking here, but if you feel like it’s a bad idea, or may hurt your name in the long run just call it a cost of doing business and ignore it on the bid.