LAS VEGAS—A decade ago, home builders put up thousands of new spacious stucco homes in the desert here, with marble countertops, ample square footage, and walk-in kitchen cupboards. Then the recession hit, the values of these homes plummeted, and economists talked of the overbuilding of Las Vegas. Now, though, developers are building once again, on projects derailed during the recession , including master-planned communities such as the 1,700-acre Skye Canyon, the 2,700-acre Park Highlands, the 1,900-acre Inspirada, and 555 acres of luxury living in an area called Summerlin. The homes being built here and in many cities across the country look very similar to the ones built during the boom. Some, in fact, are even bigger. The average single-family home built in 2013 was 2,598 square feet, 80 feet larger than the average single-family house built in 2008, and 843 feet larger than homes built in 1978, according to Census Bureau data . Here in Vegas, many of the new homes going up are two-story tan stucco with garages that fit two cars and look pretty similar to the house next door. Others, like those planned for the development Ascaya , which bills itself as “a new level of luxury…