A woman is recovering in hospital tonight after the balcony of her home in Wollongong gave way as she stood on it.

The structure on a street at the Berkeley home collapsed at around 7am, with neighbours alerting emergency services.

Paramedics arrived to find the woman, aged in her 70s, covered in debris and suffering a fractured pelvis and lower leg injuries.

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"On arrival we were faced with a number of challenges as the balcony had completely collapsed, and we needed to safely extricate the female patient from the debris," Inspector Norm Rees from NSW Ambulance said.

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Paramedics including an ambulance helicopter attended the accident and the woman was airlifted to St George Hospital in a serious condition.

"NSW Fire and Rescue crews did an excellent job, providing the best possible environment for paramedics to safely treat our patient."