I am a design remodel contractor with 30 years experience and a real estate broker. This is a very cost effective way to add square footage to a home. I would build it so it could easily be removed when you sell. Take pictures off how it is build so potential buyers can see how to remove the wall if desired. For this reason I would leave the garage door in place rather than do siding. Spend some money on an insulated garage door with windows for natural light and a upgraded design that fits your home to add extra curb appeal. I built a great man cave hangout with a TV and sports hang out for a client and it was great to be able to open the door and have friends and neighbors come over and hang out, BBQ and enjoy the weekend.
Vince Meichtry new dwelling real estate + Living Green Remodeling