How easy is it to move a garage and attach it to a house?
Moving a garage is not very difficult. Here are a few pointers:
(1) In most cases, you will have to add some temporary structure to keep the garage from falling apart while it is being moved. For example, you might have to "tie" the walls together to prevent them from spreading out.
(2) You may be able to skid the garage on the ground by lifting the existing wall plates onto some wooden skids and then pulling the garage to the new location. The pulling can be performed by a vehicle or a "come-a-long" (a very useful too