Converting a 1 Car Garage into office and shed?

I am purchasing an older home with a detached 1 car garage. The garage was built when smaller cars were the norm and most people in the neighborhood only use it for storage. We are thinking about eventually converting the garage into an finished office and separate storage space (like a shed for garden type storage items). Would this be a mistake in terms of re-sale?

Converting a 1 Car Garage into office and shed?
No, this would make the house/land more valuable. Anybody can take it and make it what they want if they don't want the office/storage space.