The truth is, that if you call a company on the phone, you are unlikely to get conservatory prices including installation because there are way too many variables that can impact the final cost & it could be a bad idea, as far as the installer is concerned, to give you even a rough price without actually seeing the place where the conservatory is to be built.
For example, what if you gave a deposit based on a verbal quotation and then the builder came to your home and found that the foundations for the conservatory ran over a drain? The extra cost of managing just this situation could be a shock and make the job way over the budget you had planned.
Go to a comparison site like www.localconservatoryprices.co.uk and get free quotes from certified installers.
You cannot underestimate the value of getting the site inspected and having proper written quotes for the work –
never go off a verbal quote to part with cash!