How to design a chicken coop?

Now you know how to choose chicken coop materials, let's move on to discuss about how to design a chicken coop?
There are quite a lot of chicken coop designs that you can find on Internet. But the truth is: many so called "free chicken coop designs" are not convenient to use and will cost you a lot of money to fix in the future or wasted too much money on useless materials or functions.
What is a good chicken coop design? How to design a chicken coop?
When building a chicken coop:
1. Make sure your newly built one are easy to clean. You don't want your beatiful chicken coop became too dirty to clean one day. Or you have to spend several hours cleaning them right?
A good checken coop design is a win-win situation both for you and for you chicken. They love it and use it at ease, so do you, that you can clean them very easily.
2. Bright enough.
Most of you love sunshine, we need sunshine not only because it can turn some elements into Vitamine D but also it keeps us healthy and happy. So does chickens at day time, enough sunshine will enable them to be healthy and happy, and can do more things for you.
3. Ventilation
If you live in a little house with a lot of people, you are more easily to get infected especially when there's not enough ventilation. The situation is just the same, if your chicken coop has not enough ventilation, the chickens will be more easily to get infected.
Now I have told you how to sign when you build a chicken coop, we'll move on to some more exciting stuffs.