I second not putting it against the wall. It makes it harder to interact with company and probably poses a greater fire risk. We put in an L-shaped island with a drop-in charcoal grill. a LP side burner, and an empty area at the end of the island for another cooker (WSM, Genesis, camp stove for wok). The other cookers rotate through that area as needed. Our location and design carries some risk, but it did not violate any codes because it is not attached to the structure of the house.
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Running water and a sewage hookup
substantially drive up the cost of an outdoor kitchen. Unless the planned location of your outdoor kitchen is a long schlep from your indoor kitchen, I don't think it is worth the money, particularly if you live in a cold climate and pipe freezing is an issue. As for a refrigerator, we had one initially. It was a cheap dorm-room style. We did not spend the money for an outdoor-rated unit. I'm glad we didn't. We got rid of it after a few years and replaced it with more storage. A fridge runs 24/7, and even the energy efficient ones use quite a bit of juice. As much as we were entertaining back then, it still wasn't worth it. A tub of ice on a table works as well or better than a small fridge. I would also skip the side burner. Everyone told us to. No one ever uses them. I used it once or twice. Keep it simple. You need room for your cooker(s), work/serving space, storage, electrical outlets and lighting. Really think about electrical and storage. If you use an ATC or rotisserie (or may in the future) plan your outlets and storage accordingly (the roti ring for kettle and roti rods take up a lot of room).