The ageing asbestos roof on the Beaton Park Tennis Club is reaching the end of its life and will be replaced, with work starting next week.
Wollongong City Council said contractors had performed a survey on the roof and decided it needed to be replaced.
The building is about 50 years old, and its interior was refurbished eight years ago.
The Wollongong Tennis Club will be closed while the work takes place from Monday and is expected to reopen by January 30.
The council's director of infrastructure and works, Mike Hyde, said the replacement work was essential to maintain an ageing building and help extend the life of the tennis facilities.
"Council has more than 155 sports buildings throughout the city," he said.
"Many of these are ageing and require essential and expensive maintenance."
The project is expected to cost about $150,000.