The reason they are starting that early is because they can't do all that during high noon at this time of year. there is really no limit on when someone and when someone can't start construction work, it tend to be between 4am and 8pm, but it does depend on the contractor.

In a month or two it will start to get cooler, and they will start later. (but the foundations should be done by then, lmao)

by some ear plugs, lol