Premier Colin Barnett has admitted the bi-partisan deal to extend retail trading hours is complicated and not perfect but he's happy the state is moving towards deregulation.
Mr Barnett said there are still details to iron out in the agreement which was struck with Labor this week.
Under the deal shops will be able to open until 9pm on weeknights and a Small Business Commissioner will be appointed.
There will also be shopping centre lease registers and Sunday trading for "durable consumer goods" including white goods.
But it is the definition of "durable consumer goods" which has caused confusion.
Mr Barnett said the problem was untangling 100 years of regulation.
"Look I don't think there's any more confusion other than for the fact that we've had 100 years of regulation," he told reporters.
"We're now trying to untangle a complex set of laws to give consumers choice. That is why I've had a simple approach. Let's take one step at a time and let's have week night shopping across the metropolitan area," he said.
The Premier said he was frustrated by the lack of agreement within the retail sector on what deregulated trading should look like.
"It's interesting in that Harvey Norman jumps in with an opinion and immediately ... what you get is disagreement from the retail industry," he said.
"That's the problem I have to deal with. The retail industry is totally divided over this issue. The government is trying to find a way through the middle," said Mr Barnett.
Mr Barnett also said that he didn't expect full Sunday trading within this term of the Liberal government.
"I guess going into a second term of government if we're successful we'd look at Sunday trading," he said.
He was confident legislation extending weeknight trading would be in place before Christmas.
