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How to keep chickens in a backyard
Buy a premade chicken coop for an easy option.
To save money and space, see if there is an existing structure in your yard that can be converted into a chicken shelter. It costs a good deal of money to hire people to build a shelter, so converting space can help with this.
Something like a small playhouse, staircase, or the space beneath a deck may work. See if you can make use of an existing structure.