*1. Decide how big a coop you want and multiply by at least 3. Mine became far too small after day one.
*2. Make the pop door high enough to keep it out of the snow. Mine is going to be too low (if we ever get a normal snowfall here in WI) I like the idea someone else offered to make the pop door close-able from inside or out. Mine opened outside. After considering how yucky locking and unlocking the door in the snow was gonna be, I made a sliding door I can open and close in the comfort of the coop. Also, it is more pest proof. LOVE it!
*3. DH started the coop with an 8X8 sand box the grand-babies outgrew. I added a floor of 1 inch hardware cloth to keep things under the coop out of the coop. Then added plywood floor with three coats of spar varnish for easy cleaning.
*4. I love the nesting boxes I have, but wish I could collect the eggs from the outside. Wish I had a space just inside the people door for me. Keep everything off the floor works well except -- I do have one tunnel-like space that harassed chickens can go behind to hide if desired.
*5. Hanging everything - keeps food and water clean, keeps grit and calcium out of the way.
*6. Electricity is a must IMHO. Lights to provide longer daylight and heated water containers.
*7. DH complains that the coop is "never done". I'm always coming up with something to add, change, or adjust. I love my coop and it is beautiful, but how do I convince DH that this "starter coop" was just a necessary tool in learning what to do differently with the next coop?
*8. Plan your siting. My big window faces due south - a good thing - but the pop door opens to the north - the cold, shady, windy north. That makes for a winter wind tunnel if I don't close the window when I open the door, but provides a cooling breeze during the summer.