Who did the controlled residential ventilation for you? For me, it was the plumber! I'm curious if there will be a controlled residential ventilation included in the offer. I suspect not, at least no central system.
HVAC technician. But yes, plumbers probably do that sometimes too. I've always preferred to bring in the professionals rather than "everything from one source." There may also be plumbers who lay tiles, it's not impossible, but in my opinion it's still a separate trade.
But I was more concerned about the price. 20+20 is pretty accurate, there won't be room for ventilation or tiles in that. Plumbing isn't just the nice fixtures at mafia prices from the showroom – half of it goes into the rough installation.