WA's peak business body has called for a radical change to trading hours over Christmas, with shops to open from 6am Monday to Saturday and for 12 hours on public holidays.

Under the Chamber of Commerce and Industry WA proposal, Christmas trading hours would apply from December 1 to January 31, with 100 shopping hours each week.

The proposal, obtained by The West Australian, is part of the chamber's submission to a State Government review of Christmas trading.

It also calls for trading from 8am to 8pm on Boxing Day, New Year's Day and Australia Day.

A spokesman for Commerce Minister Michael Mischin would not reveal this year's Christmas trading regime ahead of an imminent announcement.

But there are expectations of further deregulation, following a letter sent by his parliamentary secretary, Paul Miles, to a regional council this month.

"Metropolitan Perth's Christmas trading hours are likely to be considerably broader than the hours currently prescribed by legislation," said the letter, dated October 10.

Shadow commerce minister Kate Doust said the CCI plan would put undue pressure on small mum and dad-owned stores. She said it would benefit only big retailers and have limited customer appeal.

"I can't imagine anyone wants to shop at 6am on Monday or 9pm on Saturday," she said.

"It would amount to deregulation by stealth."

But CCI WA chief executive Deidre Willmott said there was broad support for further reform, including the proposal for shops to open at 6am instead of 8am.

She said almost 60 per cent of respondents in a recent consumer survey supported the full deregulation of trading hours.

The survey showed most had taken advantage of late-night weeknight trading (69 per cent) and Sunday trading (82 per cent) since their introduction in 2010 and 2012 respectively.