Major south-east Queensland stores will be able to open longer with the state's industrial relations commission unanimously granting an extension of trading hours.

The changes, which will come into play on December 1, will mean major retailers can open from 7am to 9pm Monday to Saturday.

The National Retail Association cited independent economic research during the hearing that suggested the move could add $111 million to the state's economy and create 1000 jobs.

"It allows consumers the choice as to where they shop," Chief Executive Officer Dominique Lamb said.