If you want to add some extra space think about the entire picture and how everything will look in the end, and do not avoid asking for recommendations from the team of home extension builders. Being experienced people they can see with another eyes your projects and can advise you in some different ways. Think about how you are going to use all the space you will have and based on that decide what is your next move. If you intend to rent or sell this house, then think about what needs it should cover.