TECHNICALLY, it is a one-car garage with the space of a two-car garage. The question is how does one adjust for this? How many people buy a home with a two-car garage knowing that only one car will be stored in the garage with the remainder being used for bike and trash can storage?
Then we have to consider the appeal, or the apparent use of a large garage with only one garage door. Joe and Jane drive up to the house they want to buy and see the one garage door and say, "we can't park both cars in the garage" even though Joe's car has never seen the inside of a garage. Joe is a good guy and has never parked his car in the garage but hopes with this house he can.
If the contributory value of a garage space (traditional) is $8,000 in the market what is the contributory value of the space of a garage the same size without an additional door? Is it the cost of installing the door or is it similar to the traditional two-car garage? How about the "pride factor"? The neighbors look at his garage and say "he has a one-car garage", and I have a two-car garage. Does Joe want to own one of the few homes on the street with only one garage door even though the garage is the same size as most other garages with two doors?
How does an appraiser "adjust" for this in a quantitative manner? I doubt anyone could with SUPPORT.
The value of the Reconciliation comes into mind here.