Paramedics were called to the site in Roberts Avenue after reports that a builder had fallen four to five metres from the site about 8.20am.
The man died at the scene.
The builder was working on a construction site being built for a supermarket, a gym and office space, next door to St George Maso’s.
A man working next door said he saw a group of men working on the top of the building before he heard sirens.
A Woolworths spokeswoman said the company was an incoming tenant to the development.
The supermarket is expected to open in mid-2013.
Romanous Construction, based at Hurstville, is responsible for the construction site.
A report will be prepared for the coroner.