It would never occur to me cleean for workmen coming in, unless there was a very good reason.
CH boilers were serviced on Monday, I moved the laundry basket and scales in the bathroom to give maximum access to the boiler, otherwise did nothing. As for the one in the garage, I did nothing.
I know the service man well, we get the same one every year. The company he works for are a local company with offices a couple of hundred yards away and, after 25 years, we are all on christian name terms.