You are expected to pay a non refundable deposit before survey and given drawings and seen samples of doors /window. You therefore have no idea of what the door/porch/conservatory may look like but just given a quote by the salesman and the surveyor may not be able to meet this quote. Whilst the original Everest Company was reliable and their work did last and was the best, have grave concerns as to reliability of current company. If for medical reasons you have to withdraw before a survey you have six months to initiate a new contract before losing your money. Only use if fit and well and in current employment because once you say yes to the salesman you lose your deposit even though no items could have been ordered before the survey.