A man has been charged with murder after he allegedly acted as a lookout in the gangland execution of crime figure Hamad Assaad.

Just after 6am on Thursday, officers from the Bass Hill Region Enforcement Squad banged down the front door of a home in Greenacre in Sydney's south-west.

Homicide Squad detectives then arrested 24-year-old plumber Osama Hawat inside.

He was taken to Bankstown police station and charged over the alleged murder of Mr Assaad last October.