If you have the option to expand your garage, either by going from a two-car garage to a three-car garage or adding some extra depth, go for it. You’ll never regret having too much garage space, and even two or three feet in either direction will make a difference. This goes double if you use your garage for storing more than just cars (as most of us do), since bikes, tools, yard appliances, and all the other belongings that end up in there take up a whole lot of space.
Building a new home means you get a ton of control over the features it includes, so take advantage! A lot of these features pay big dividends, both in form and function while you live in the house and resale value if you end up selling later on. Talk to your builder to see what’s possible.