There may be set back requirements for instance, my subdivision calls for no permanent structure within 5 ft. of property line but neighbor put fence right on line anyway. I didn't report him as he was the Personal Rep. for a company I was trying to get on at, I did. Neighbor behind did mow a couple of feet over my line right down into the dirt as said above and crocked. Got new neighbor, will see this year. I mow 3" high.
Walt Conner