1. You can certainly sue the structural engineer for professional negligence for the design and calculations for your house extension, as they were performed in a careless manner and were not such that a reasonably competent structural engineer would do. You can recover the £2,000 you had to pay for a new engineer to do a fresh series of calcs and for any associated damages you suffered. It was careless to put the main support against a ventilation shaft and the onus was on the structural engineer to satisfy himself that all was in order with the design he prepared. This he did not do and as a result he can be successfully sued in negligence for the losses you have suffered. You chances of winning are excellent and you should get a solicitor to sue on your behalf if the structural engineer will not accept liability for the careless work he carried out.
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