The Frankston Mechanics' Institute was expanded in 1915, with a 22 x 50 feet brick addition to its street frontage, at a cost of £529. The 1915 brick addition is now the oldest extant part of the building after the 1881 hall section had to be rebuilt in 1956 due to fire safety concerns. It became the eighth building to receive a blue plaque from the Mechanics' Institute of Victoria in 2004. In 2009, Frankston City Council undertook a A$2.5 million restoration of the building to its 1915 design.