Operator, Brennan Webb, 36, was working for Febrey Structures of Bristol, on the Marine Parade shelters regeneration scheme.
He was unloading and placing sheets of shuttering ply to the upper floors when the accident occurred.
The boom of the JCB telehandler was fully extended when it toppled and its load smashed onto three beach huts. No one was hurt.
Town clerk Mike Lewis said: “The main contractor promptly notified the Health and Safety Executive (HSE).
“A team of senior executives from the company including the in-house health and safety officer and external H&S advisers attended the site within two hours, from which an incident report will be compiled, in addition to that of the HSE in due course.”