Simon Hart MP has learned that the owner of Carmarthen's dilapidated Old Infirmary has been given another 20 months to carry out its restoration.
Developer Dorian Davies was served with a notice by Carmarthenshire County Council ordering him to carry out work on the Grade 11 listed building by July this year.
But Mr Davies challenged the notice saying that it did not give him enough time and his appeal was due to be heard in January.
However Mr Hart has now been told by Eifion Bowen, head of planning at the council, that the two parties have avoided a court case and Mr Davies now has until September 2016 to complete the work.
The Carmarthen MP said: "What worries me is that this is no guarantee that the work will be carried out and if it does not happen soon then the building will crumble away before our eyes.
"The owner could have started restoration work while he was challenging the notice but instead chose to delay repairs by another seven months.
"I appreciate that the Council wanted to avoid an expensive court case but I fear that the whole problem has just been swept under the carpet for another year."
Simon Hart MP
House of Commons
15, St John St
or 0207 219 3000