Work to install new pillars at the entrance to Swaffham’s town hall will take place next week.
Although the columns at the front of the London Street building, which also houses the town’s museum, have been repaired, officials say they now need to be replaced completely as the bases have rotted.
The new pillars are being made off-site and will be installed next week.
The museum will remain open during the work, but visitors will be directed through an alternative entrance on Cley Road.
Town clerk Richard Bishop said it was important that the work was completed before the peak tourist months of July and August.
He added that council staff would be working to decorate the columns once they have been installed.
Mr Bishop said: “First impressions count a great deal and we want the front entrance to the town hall and museum to be inviting and attract visitors to both the museum and tourist information centre situated within the museum shop.
“Every effort is being made to minimise any disruption to the museum for the main day when the new columns are put in position.”
Museum chairman Steve Gregory added: “We welcome the completion of the work and will work with the town council to ensure the museum remains open whilst work is in progress and that any visitors to the museum or TIC can get to where they want to be without any cause for concern.
“We will generally be very pleased to have the front portico of the town hall, which acts as the main entrance to the museum, looking at its very best for many years to come. This has to be good for all concerned.”
Originally built as a private home in the 18th century, the building was bought by the then urban district council in the 1950s, when it first became the town hall.