Fully fitted conservatory prices start from around £4,000 for a small room up to £20,000 + for bigger, more bespoke rooms. To get an idea on how much you can expect to pay for your new conservatory, you can use our conservatory cost calculator. It will provide you with a unique online guide price based purely on your own specifications. Fully fitted conservatory prices will vary from company to company and is also very much dependent on design.