Ty Sharp, a 26-year-old software consultant from Aspen, Colo., is building a 2,876-square-foot vacation home in Ventura, Calif. The four-bedroom, four-bathroom custom home, for which he’s paying ...

Set on a vineyard in California’s Napa Valley, a compound intended to entertain a large family is in the early stages of design. In addition to the main residence—in what Oakland, California-based ...