 Well, adding a backyard deck is one surefire way that you can increase your home's living space. But if you're not careful, it's really easy to make some costly mistakes. So here's what you need to avoid. First of all, you've got to think about traffic flow and convenience. Now, most people like their decks to be just off the kitchen for obvious reasons. Now, if you're going to build a wraparound deck, you want to try to have the door to the deck just off of the kitchen, which is going to make all of that summer barbecuing and even wintertime grilling a breeze.