So who's a chicken person on Urban? And can you recommend a good book to get us started?
I've git chickens. If you want to build your own house, look for the 'gold cockerel' book of DIY poultry house construction (there are some in the 'smallholders DIY' by the same people too). Theres loads of books out there, the chapter in Seymours' book'd do if you have it.
Poultry need: Food, water, somewhere to nest (lay), somewhere to roost and protection from charlie (I have a 'leccy fence, but lots of people shut em in at night and let em out in the morning). As long as you can provide em that, you wont go far wrong. I've got a few books - cant remember looking at 'em since I first got my hens though.
A cheap way to house your birds might be to 'mod' an old shed if you can lay your hands on one. I got a nice wooden henhouse on freecycle, wouldve been about £300 new - I had to scrape off the old chicken shite, repair some perches and get it out from where a horse yard had been built in front of it (over some fences and onto me pick-up), bargain. I think the previous owner had given up on hens cos of the bird-flu scare.
You can find pullets from day-olds to point-of-lay and various stages in between. If you are beginning, I'd get 'em at point-of-lay. You can pay silly money these days for 'breed' birds. Ask yourself what you really want em for - as with most things, I've ended up with a raggle-taggle of half-breeds cos I'm a sucker for a deal. Mine all lay well, and look as though they will produce edible offspring, albeit somewhat small, however there's only two of us, so that don't bother me. You could also rescue battery hens for nowt, but I've always been put off cos my instinct is to buy healthy stock and those things look awful, but I'm sure you would feel good about yourself for doing it - they are unlikley to produce offspring that are any good for eating though being pure laying machines.
I did see on that 'countryfile' that chicken keeping is a massive growth passtime, and demand will drive prices up, sure as eggs is eggs. But, like anything, you can still do it on the cheap if you put your mind to it.