I know that half the stuff I thought was needed or was recommended to me ended up being useless or more hard work than anything. So lets get posting and myself and the mods can edit this first post with anything essential... Like how much space is needed, saftey features, feed, etc etc

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1) Neighbours and permissions.
Some rented accommodation and even some owned properties might have clauses which forbid you from keeping Hens. Also, if you are close to neighbours they may object to the noise / smell.. even though Hens aren't noisy as a rule and shouldn't smell. I suggested to my neighbour to get Hens a few years ago and she started muttering about the noise and smell and when I asked if mine were noisy or smelly she was flabbergasted to learn we even had any! Other neighbours might not be so cool... so something to consider when placing your hen house next to someone's bedroom wall!
2) Holidays & Delays
Who will look after your Hens when you go away? Also if you commute who can you call on to go and secure the Hens should there be a delay? Some places that sell hens also provide Holiday Boarding, it's worth thinking about all of this before getting Hens.
3) Bye bye lay-ins
Unless you have an automatic pop-hole then you can wave bye bye to sleeping until 11am on a weekend. Even in the dark of Winter Hens get up pretty early and will need to be let out, fed and watered. (then you can jump back in to bed!)
4) Housing
5) Food and Water feeders & storage containers
ok that's the kind of thing I was thinking.. will let others add their ideas and then we can start to paste some ideas to this top list. If anyone disagrees with what I have put in so far then say so below as of course it's just what I think and everyone is different.