Think green home design is a fad? Well, think again. Sustainable home designs are gaining popularity at a breakneck speed. In 2017, green homes accounted for more than 60 percent of family home builder's portfolios, according to a survey conducted by the National Association of Home Builders.  But what is really driving green home designs? In this post, we explore five trends shaping sustainable homes.  1.    Energy Efficiency  Home designs that cater to consumers' need to reduce utility bills continue taking center stage. From net-zero energy homes to energy conserving products, home buyers want to save money. Moving forward, industry…