Today’s homes have more square footage, baths, and garages:
The graph above, created by Mark Perry, shows that in 1973, a little more than half (52 %) of new homes built had either one garage (17%), a carport (13%) or no garage (22%), and only 48% of new homes included garages for 2 or more cars. In each of the previous ten years, 80% or more of new homes build have include garages for at least two cars (data here).
In 1973, 60% of new homes include two or more bathrooms. By 2005, 96% of new homes had two or more bathrooms (data here).
What is the bottom line? Perry explains:
A generation ago it was fairly common for new homes to be built with a single garage, single bathroom and no air conditioning, and today those types of new homes have become extinct. What are most common today are new homes with two or more bathrooms, two-car garages or bigger, central airconditioning, and 50% more square footage than new homes in the early 1970s (data here).