The Opera House in Mount Pleasant Road needed to be repaired after part of the roof collapsed in 2020.
It had been discovered that the dome ceiling on the century old building was in need of restoration to ensure it did not degrade further.
The roof had been repaired once before after it was bombed during World War II.
The building has stood in the town since 1902 and was designed by Edwardian architect John Briggs.
As its name suggests, it was built as an opera house before becoming a cinema, a bingo hall and finally a pub when Wetherspoons took over in 1996.
The chain, which has reputation for restoring Grade listed buildings, says it spends millions each year on renovating many of its public houses.
Wetherspoon’s property manager, Craig Beardmore, responsible for overseeing the project at the Opera House, said: “Wetherspoon invests heavily in its historic buildings for future generations, almost providing a civic service and duty to ensure the upkeep of some incredible landmark premises.
“Each project is site specific i.e. no two pubs are the same, with the timescale and cost of the work dependent on the condition and exact requirements needed to repair and restore.
“These works are undertaken not because the ceilings are in a poor or dangerous condition, but, as with all historical buildings, essential improvements are required to ensure that they never reach that critical stage.”
Ross Markwick, pub manager at the Opera House, added: “Our pub is housed in a local historic landmark enjoyed by so many people and, as the current custodians, Wetherspoon is responsible to ensure its preservation for now and the future.
“This most recent investment, helping to keep this iconic building looking its best, highlights that commitment and we are proud to be a part of the Tunbridge Wells community at Opera House.”
