Council chiefs have been left with a £700 repair bill after two windows and a door were smashed at Chorley Town Hall.
Revellers are believed to have caused the damage in three separate incidents.
No attempts were made to get inside the building and nothing was taken.
Police and council bosses are examining CCTV footage to find out who was responsible for breaking the two windows and the glass panels in a side door at the building in Market Street.
It is thought separate people punched windows overnight on Boxing Day and Sunday, January 5, while an alcohol bottle was thrown through a glass door panel on Tuesday, December 30.
Coun Peter Wilson, deputy leader of Chorley Council, said: “Each of these incidents was mindless vandalism by people who’d had too much to drink, but it’s costing us hundreds of pounds to repair.
“This has to be met by council tax-payers and we’d much rather spend that money on benefitting the people of Chorley.
“We’re looking at our CCTV and that of nearby businesses to see if we can find the culprits. When this has happened before, vandals have been identified and the last time they were prosecuted and the council awarded compensation.”
PC Nic Barff-Lewis, from Chorley neighbourhood policing team, said: “We want people to have a good time in the town centre, but there is no reason why they should be breaking windows.
“If anyone has any information or if anyone saw anything, please contact us.”
You can call police on 101 or Crimestoppers, anonymously, on 0800 555 111.