A worker has been rushed to hospital after being buried in debris and rescued by volunteers after scaffolding collapsed from a concrete pour at a development site on Hotel Rottnest .

St John Ambulance said the man fell three metres from on top of the scaffolding and was flown to Royal Perth Hospital, while a second person was less injured in the incident on Wednesday morning.

The man was working at the rear of the popular heritage hotel on the new Hotel Rottnest Resort development. Credit:Nine News Perth

The man was working at the rear of the venue on the new Hotel Rottnest Resort development, which will see 80 new rooms on two levels, two courtyard pools, a new function centre and beach club added to the popular heritage pub, which recently underwent extensive refurbishments to its main bar and dining area.

Workers told a source familiar to WAtoday that "some concrete had fallen from the top floor" of the new resort development after a concrete pour, hitting the scaffolding the man was on and trapping him underneath debris before he was rescued by career Fire and Rescue Service firefighters and private volunteer firefighters.