When it comes to single doors for the garage, most people have a good idea of how large they are. They tend to be between 8’ and 9’ wide, and they are between 7’ and 8’ high. When it comes to the double garage doors, the size is naturally going to be much larger. They will often be between 14’ and 16’ wide, although they could be up to 18’ wide in some cases. If you have an RV or an SUV, though, you might be wondering if the size of a garage door is going to be large enough to handle your vehicle. While the width might be fine for many of these types of vehicles, there can sometimes be a question of whether the height is going to work.