 Now, on the flip side, don't supersize your rug to the point it engulfs your entire space. You want your furniture to sit comfortably within the room, but that doesn't mean the rug should dominate. Many stores sell five by seven foot rugs. That's what you most commonly will find in stock. I know it's tempting to buy that size, but designers say that tends to be too small for a lot of our living room spaces.