Orangeries are a combination of a traditional built up extension of brick and a conservatory. They give you the privacy of a brick room, as well as the permanence and security. However, because of the large and plentiful windows, it does not come at the expense of the brightly sunlit rooms that a conservatory provides. Speaking of expense, the cost of installing orangeries is much lower than the price of putting up a built up extension! This makes them value for money substitutes for both a built room and a regular conservatory.