I have bantams and three sex-links and a EE, I have never had any problems with them going OVER my fence when ranging yard. We have a 4 ft. fence. However, my wyandotte bantam found a way to get under a gap in fence
we have just your basic wooden fence, and their run is open on top as well. they have never flown over it. they have perched on the fence of their run but its really low. you can see what im taking about on my page.
My BR hen liked to jump up and over my 4' fence when she was out - to visit the neighbors - she was very curious. I clipped one of her wings and that solved the problem - she was really too lazy or heavy to work hard enough to hop up after that.
I would recommend some research on different breeds. Usually the Mediteranian breeds are more noisy and flighty. Also most Bantams are good flyers and easy pray for hawks.
Asian breeds like the Cochins or Brahmas are heavy, quiet and will not fly over a 4' fence.
I also live in a residental area, with 6-ft high wood fencing. I've only had my hens for a couple of weeks. They spend most of their time in a covered run, but I let them free range while I'm out gardening (and the dogs are in the house). Well silly Penny decided the grass was greener and hopped up onto the fence and then over. Of course the other two hens were shocked and confused. Where did Penny go? Penny's the boss hen. Luckly it was into the vacant yard next door, otherwise it could have gone very badly! We have dogs on one side (though to her credit she did give a look around from the top of the fence before making the leap). No more free ranging
I was hoping to get our chicken tractor done this weekend, but our saw broke. Anyway, I was just mentioning it because they are medium sized hens, easter eggers, and she had no problem at all hopping the fence.
I'm now to scared to even try the one wing clip method, because what if she can still make it over and gets eaten buy a dog. She is a pretty bold/adventurous hen (she pecked my dog on the nose this morning).
I think that if you clip 1 wing you'll be able to keep her in the yard. She's a heavy enough breed - a game bird would be a different story.
I'm so thankful my girls haven't figured out that there *is* another side of the fence! I think they have a pre-Columbus viewpoint of the yard: the world ends where the fence begins.