The district council replaced ageing wooden louvre window slats and re-pointed much of the ancient brickwork.
A full survey of the medieval building, which was built between 1403 and 1412, was also carried out to secure its long-term future.
District archaeologist, Simon West said the clock had also been repaired.
“The clock wasn’t working, the automatic winder had gone so we had to have that repaired too.
Story: BBC News | Photo: BBC News