I'm not who you're replying to... but: it cost me $2-2.5k to build my coop two years ago which houses 5 hens, and they cost roughly $10-20 per month to feed, change bedding, etc. Realistically my household eats 4 dozen eggs a month. Even with current egg prices I'm not saving any money for a long, long time.
Still absolutely worthwhile for my mentally though and one of my major life goals
It's probably best not to get specific instructions. They constrain you too much.
The cheapest way to build a chicken coop is to go to the local rubbish tip, or tip shop if the top doesn't let you fossick. Be a little imaginative with your design. For example, you can build them out of PVC water pipes. They are light, don't rot, wire can be pop riveted to them, and they are very easy to glue.
I also turned a 80 litre rubbish bin into a chicken feeder. Getting the design reliable was a few of weekends work of trail and error. However once done my time was paid back over and over again. A rubbish bin can hold an entire 30kg bad of food. It takes my chickens 3 months to go through a bag, so the reduces feeding to once per month. (We also gave then table scraps, which is a daily chore.) I also built a automatic water station out of an old office bin and a toilet inlet valve. The net result of all that is the chickens can got for months without you touching them, which is far longer than any family holiday.
Like some others here, I don't quite get the cost aspect. A carton of 12 eggs in about $6 here, and 3 chickens produce about 2 cartons a week. The food costs about $10/month. If you have a yard, food costs can be reduced by about 1/2 allowing them out during the day. Allowing them to graze can automated too - you just need a 12v electric car window opener connected to a battery, solar cell and timer. Again, if you get these things second hand they will cost you less than the $60 of food they save in a year.
All that said, yes it will take a few years to repay the costs, and even if you automate to the degree I did taking the table scraps out to them and getting the eggs remains a daily chore. To me the engineering project of "how can I automate this at least cost" was as interesting as the chickens themselves.
Chicken wire doesn't actually protect chickens from predators... Half inch or smaller hardware cloth is needed to keep them safe. The coop itself is a 4x8 (about 4' tall) building on stilts because that's roughly the minimum space that's healthy to keep in the winter if they get snowed out of their run. And I dont know where/when you've seen chicks for less than $1 per bird lately, last time I saw that was on broilers last year when the local feedstore accidentally ordered like 3000 instead of 300 and they were literally giving them away. Otherwise chicks are $4-5 each
>I'm not who you're replying to... but: it cost me $2-2.5k to build my coop two years ago which houses 5 hens
These numbers are absurd. You need a wooden box and some chicken wire, and chicks cost less than $1/bird. I don't understand why this always comes up on HN, where people are spending thousands of dollars on chickens. It's the simplest animal you can possibly own and they should pay for themselves almost immediately.