Typical Budget for a Family of Four. It is often said that life changes when you have a family to raise and there are many ways in which this could be true. When it comes to finances, you can always expect to pay more once children come along. It's important to take a look at the basic, minimal budget needed for ... Jul 17, 2017 · Pool builders are typically willing to build in-ground pools to the size and shape that best fits the homeowner's budget and available space. Common sizes for rectangular in-ground pools range from 10 feet by 20 feet at the low end to 20 feet by 40 feet at the larger end of the scale. Average Home Size is Shrinking. According to a United States Census Bureau study conducted in 2009, the average size of the American home is actually shrinking. After increasing continually for 30 years, the average size of single-family homes constructed in the U.S. peaked at 2,521 square feet in 2007.