Home remodeling is exciting. New layouts, modern finishes, and improved functionality can completely transform how your home looks and feels. But beneath the excitement lies a risky truth—small design mistakes can quietly turn into expensive regrets. Many homeowners end up spending far more than planned, not because they chose luxury upgrades, but because of avoidable design and planning errors. This article breaks down the most common home remodeling design mistakes—not just what they are, but why they become costly and how to prevent them.