Zillow Advice: Zillow Questions - Before adding a detached 2-car garage I want to know what value it will add to my house. http://www.zillow.com/advice-thread/Before-adding-a-detached-2-car-garage-I-want-to-know-what-value-it-will-add-to-my-house/477575/ Zillow Advice | Zillow Real Estate