unlike some other types of conservatories and sun rooms, aluminium conservatories are so reasonably priced that most homeowners can easily afford them (cost guide here).
Furnishing a Large Conservatory
Go to www.conservatorypro.co.uk/large-conservatories where you can see more about large conservatories and then think about how to furnish your extension.
Common choice of furniture, therefore, are combination pieces like rattan with discretely coloured fabric cushions will provide a nice compromise in the conservatory space between the outdoors and inside.