Well, there are ways and there are ways. So far, I have been getting away with not locking up my hens most nights, but it would appear that my suburban neighborhood is very low on predator pressure. It might be ok where you are, or it might be a horrible tragedy.
My hens don't give much of a thought to going right over a meter high fence. If you think chickens won't/don't fly, you could be in for quite the surprise
I use deer netting as a lid to keep my girls from going to visit the neighbors, which can get us all into trouble when it happens.
Another point about putting a lid on - aerial predators. The other day my wife and I were out in the back yard, looking at the sprouting garlic and listening to the chickes, just generally enjoying one of the first nice days - and we noticed two Large hawks soaring about above us. They could definitely take on our hens, they would probably like to take on our hens - but, one, the hens may have noticed the hawks, because they were not out in the open anymore, and even if the haws tried - they would hit the deer netting and that, I hope, would prevent them from getting to the hens and make them not want to try again.
Which fencing in your area? So much depends on what you have to protect your chickens against. I am spoiled, and I appreciate it, in that, so far, we have had no predator problems.