We tapped experts to fill us in on the most common living room layout mistakes. Many of us decide on a living room layout and never really question it again (at least, until it’s time to buy a new couch). Keep reading to see what interior designers say are the most common living room layout mistakes to avoid. Her expert tip for creating a comfortable and visually appealing living room layout? She recommends planning the living room layout around the main walking areas to avoid obstacles and ensure the space doesn't feel cluttered.