House is just a place to sleep, so I won't comment on that. You've already gotten some good advice on it.
As for the GARAGES...
I strongly urge you to increase the size of your attached garage. Less than 22 feet wide, total will be a problem for you at some time. Do this - park your car and your wife's car side by side and open one door enough to get out between cars and one on the outside of each - not fully open but enough for ingress and egress. Leave the doors open and measure the width. Unless you have a prius and she has a honda fit, you will realize you need a wider garage. Go wide enough for an 18-foot wide door. I promise you won't regret it.
Also, since you are on a large piece of land, it might make sense to build a pole barn instead of the fancy detached garage. For the same money as that detached you could probably build a 40x80.