After building myself a DIY cat fence to allow my cats to enjoy my backyard without worrying about them escaping our property and facing the dangers of traffic, predators and other cats, my friend loved the idea and asked me to build one for him and that I could charge him the going rate. The thing is I have no idea what you would charge someone to build such a fence, I figure you would include the cost of the materials and labor but how much would labor cost? Is it per square foot?