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On what basis did they do this please?Alex
Ok. Then they would have needed your permission and I'm any event it may be that a party wall notice would be required.
You can seek a court order requiring them to stop works, put it back or comply with the party wall act. You would need to complete form n1
The court will set the matter down for a hearing and decide whether to make the order. If the court does make an order and they breach it, this could be contempt of court which they could be warned, fined or sent to prison.
Can I clarify anything for you about this today please?