(This applies to how your home looks as well as how it functions)
To achieve a result that will serve you well for the life of the home/project, a good understanding of this is very important. Things like space for children (present or future), storage options, furniture requirements, electronic item placement, and appliance sizes are all examples of items that fit into the “want vs. need” identification. Which category they fall into is different for everyone. Understanding the differences in these two things as they apply to you, will greatly enhance the building process!