We have four bantams in a wooden coop which cost £140 on Amazon three years ago (it was bought as a place to put our indoor only cats on sunny days outside so that we could have doors wide open), and which is supposed to house 5-6 full sized chickens. This sits on concrete (which means foxes can't dig underneath it... and nor can rats), which can be pressure washed every now and then, as needs be. They also have a lawn run, which cost £50 and a lawn run shelter (which they all complain about and pretend to loathe... but which they all lay eggs in, so they don't hate it that much!), which cost £30. They don't sleep in this overnight, however, as it's on the lawn and... well, mine are spoiled birds (plus we have a lot of outdoor cats, and wandering foxes in the vicinity, so I'm not running the risk).
All told, my four chooks cost less than my two children do, to feed, individually each week. And, frankly, the cuddles my rooster gives me each day, the eggs my hens lay, and the fact that I don't have to beg them to eat their green leaf veggies... makes it all worth it. If the dog didn't already hold the title of "favourite child", then it would belong to my rooster. I'd not be without them. And as I had a serious phobia about chickens until these four flew into my life? That's saying something! Until these, I didn't know that chickens were even capable of individual personalities! Or voices! But now? Now... I know.
My daughter tries to convince me to be rid of them on a near weekly basis (we've had them since August), because she doesn't understand their quirks. Because she won't spent time watching or being around them. Maybe try getting your DH to sit and observe them for a while? Talk to him about how Hen A is bossy, whilst Hen B is a little nervous around X... and does he have any ideas how her confidence can be built up so that she's not nervous anymore?, for example. Didn't work with my daughter... but it did with me! And if I, a chicken-phobe (I was attacked by a flock at a very young age whilst carrying a feed bucket for them), can now not only be around, pick up and cuddle, but also dive into the middle of a rooster squabble for dominance with a bolshy hen, without second thought... yeah, it's doable.
Good luck.
And welcome to the joyful madness that is sharing your life with chooks!