Polmak Church was, unlike most other buildings in the county, not burnt down during the German retreat between October 1944 and May 1945. Hence the very first church service in liberated Norway took place in Polmak Church on18 March 1945.

As the post war reconstruction got underway there was a local demand for the church to be renovated and improved. The Directorate for Cultural Heritage required that it should be easy to see what was new and what was original and that the two should harmonize. It did not take long to agree that the new extensions should be built using wooden stud frames. The solution was that the extension to the west, replacing the old vestibule, was made slightly wider than the nave, thereby also allowing space for a small organ gallery without changing the slope of the roof.

The old turret was moved from the nave to the new extension to the west, but as its walls were open it was now given wooden cladding. Originally the church bell was accessed by external ladders, but now it could be accessed from inside the building. The new vestibule was inside the extension and the main entrance door has the same wide horizontal cladding as the old one. Even the old dry stone foundations under the church were replaced with site cast concrete.

The weather vane that sits on top of the spire shows the year 1853. The church bell is from 1739 and has the following inscription: "Me fecit Johan Barthold Holzmann Hafnia". Johan Barthold Holtzmann was a bell founder in Copenhagen. This bell has most likely been transferred from one of the other churches in the diocese.