As long as they have a permit, they are working within the hours set forth by your county (usually 8am to 8pm) and they aren't breaking any noise ordinances, there is nothing you can do to get them to stop. You could always offer to pitch in on the project they are working on; the more help they have, the quicker the work will be done and the sooner you can go back to peaceful, quiet Sunday mornings.
When my neighborhood was being built, Sundays were quiet. So there was no building allowed on Sundays. I bet they don't have a permit. You need to explain to them this is the only day you have to relax and something else needs to be done. On the other hand, they may be doing this on Sundays because it's the only time they have to do it. See if there can be a better schedule worked out.