Mr Edman said dozens of people were lined up to enter Rockingham Shopping Centre from 10.45am each Sunday.
He said business owners, whether retails giants or small business, should be allowed to decide when they wanted to open.
�It�s not up to the government to say when they can or cannot open, it�s ludicrous,� he said.
�By the time many shops open at 11am, half the day has gone already.�
Mr Edman has surveyed dozens of local shops and said there was growing support for extending Sunday trading hours.
�It�s hard enough for business at the moment, we shouldn�t be dictating to them,� he said.
Mr Edman said full deregulation of trading hours was some way off but extending Sunday trading hours was what retailers and shoppers wanted now.
�After 5.30pm on weekdays, it�s only the big retailers that stay open,� he said.
�Small retailers have survived.
�Some businesses chose not to open at all on Sundays and they should be allowed to do that, but at the moment shopping centres won�t allow stores to open before 11am.�
Rockingham Kwinana Chamber of Commerce chief executive Tony Solin said he supported extending trading hours.
�We will support our businesses for increased flexibility of working hours, for both employers and employees,� he said.
�However, we do acknowledge the additional pressure that penalty rates place on small businesses, and how difficult these make competition with larger corporate groups.�