Poly-carbonate roofs are bery often changed at a later date for solid or glazed roofing by owners who have found that they don’t get along with poly-carb.
The best thing to do is to shop around for design ideas and prices beforehand, and this is where this website can help you out: www.conservatorypro.co.uk/how-much-does-a-cheap-3×3-conservatory-cost