We decided not to bother with a Conservatory on the house we live in now, as the back wall of our Dining room where there would be space for one faces North East, as gets little Sun during the winter months.
Both of our neighbours, who's house design is different to ours opted to fit one, effectively doubling their downstairs space. The Neighbours to the left of us bought a really cheap Conservatory from B&A and erected it themselves, it's now looking in a bit of a sorry state as the Glass has started to fog within the Window panels, and the seals at the base of the Polycarbonate roof have come off allowing Algae to grow inside the layers of the Polycarbonate, leaving it the colour of a swamp!
The Neighbours to our Right, bought there's made to measure from a leading national Conservatory company, professionally installed, well built and still going strong after 22years! Both Neighbours agreed though that their lounges had been made much darker inside by the Addition of the Conservatories across the only lightsource of the original Patio doors and small side window. , something that a lot of owners do not realise until the Conservatory is completed, and shopping the Clear roof for a solid one can only make the problem worse.