If there's no way to place the panels, or they would always be in shade due to trees, then it's not required. Otherwise the builder can place the panels where

If there's no way to place the panels, or they would always be in shade due to trees, then it's not required. Otherwise the builder can place the panels where they want. And if for some reason they don't want them anywhere near the site, they can also purchase shares of community solar projects elsewhere. (Which is often a good option for existing homeowners, too.)