The Duncan Pavilion in Castlecliff is in need of repair with Whanganui District Council estimating it has just eight years of life left.
The building is owned by the council, which leases it to community group, Progress Castlecliff (PCC).
At PCC's recent annual meeting, chairwoman Mary Ellen Goodsir said the group has been told by council the foundations of the pavilion were deteriorating.
Property attributions manager for the council, Sandra Woodhead, said the deterioration was due to the age of the building and the harsh coastal environment.
Woodhead said the council estimated the building's remaining life span to be eight years.