If you are considering raising your own chickens you will need a chicken coup, or poultry pen. The following chicken coop and poultry pen plans are free. Consider your chicken coop or poultry pen requirements and available space, then you can either use one of these chicken coup or poultry pen plans or modify one to make it suit your specific needs and requirements.
Good instructions and general information on this poultry pen. Other designs and photos of poultry pens are shown. As well as good information on raising chickens.
This link is to the North Dakota State University and contains close to 100 plans pertaining to raising poultry. There are plans for poultry barns, brooder barns, feeders, shelters, laying houses, and nests.