The popularity of the lean-to conservatory is going to stay around for along time. A simple rectangle with a one sided sloping roof that can be constructed in next to no time on a very low budget. See more here: Large Lean to Conservatory Designs & Costs
A sensible thing to do if you are in the market for a new conservatory, is to go on the web and look to see the features, styles, options and average prices – how much the average conservatory costs.
If the foundations are not correct, then you room can sink, distort or in extreme cases simply fall apart. – this can add to the price, so you need to have agood idea of How Much do UPVC Conservatories Cost?