How many times have you read the dimensions of a room on a floor plan and then realized your existing furniture doesn't fit like you thought into the finished room? Measure your existing furniture before deciding on final sizes for a home. If you're not sure how large of room you need, measure your existing furniture, tables and walking area to determine how much space you REALLY need in your next floor plan. Add on additional area if you're trying to add space to your next home.
While you can change your floor plan in the future, remember you can't change the location. With this in mind, don't make the mistake of falling in love with a floor plan and forgetting about the property and surroundings of your home. If you fall in love with the layout of a master bedroom in floor plan, but don't like how it looks out over the street in the model home – chances are your home in your location will have a totally different aesthetic, view and therefore feel different. Remember when choosing a floor plan; ensure the interiors will fit with your location.