My RV barn is 18x44 with a 14x14 sectional door and Chamberlin Liftmaster opener. Lexan upper level windows on the east and south sides. 50 amp service and a macerator pump. Now it is fully insulated. It adjoins the 2 car garage and 'house' so just 30 ft from door to door. Probably cost around $10k, but just part of a total rebuild after 2011 wildfire. We lived inside the RV parked inside the barn for a number of months until the house was finished. Original fire damaged garage slab is visible in front of the truck.