Back in the days before we built a new garage addition (roughly 15 years ago), I used to brew outside in my barn. It is about 200 feet from the house and I had to haul brewing water out to the barn, brew the beer, run a hose 200 feet from the house to the barn to chill the wort, haul the wort back inside inside to my fermmenter in my basement, and clean up the system with cold water (a real PITA to do).
It can be done and you can make good beer brewing outside. That said, I am glad not to have to haul all this stuff to and from the barn anymore and I it is great to have hot and cold running water in my "in the house" brewery to clean equipment.