If they're still in the demo phase, then you'll hear the jackhammers for a while. After that the loudest thing is usually the big hammer machine that sinks the foundation beams (if they're doing it that way). Bam, bam, bam all day. That only lasts a few weeks though usually. Once the foundation goes in, it gets a lot more quiet. Cranes and power tools aren't that loud.

It is still loud/noticeable, but definitely not as bad once the exterior is complete (and windows are installed). I second the suggestions for noise-cancelling ear plugs (comfy ones to sleep in and bluetooth for working). I will also say, you may adjust after a few weeks - I don’t get woken up anymore when it starts in the morning because my system is just used to it.

Pretty much everyone who lives in DC has had construction near them at some point.