The WA Greens have offered to work with the new Labor Government to achieve a version of one vote, one value electoral laws for the state's Upper House.

They also voiced their support for other Upper House reforms, including group voting changes similar to those introduced for the Australian Senate last year.

It potentially opens the door for substantial change to the way the Legislative Council is elected.

The comments follow Premier Mark McGowan's description of the current system as "fundamentally unfair", after Labor fell well short of an Upper House majority despite its landslide election win.

Labor nearly doubled its Lower House representation in last month's election, but won only three extra Legislative Council seats, giving it 14 MPs in the 36-member chamber.

As a result, it will need crossbench support to pass any legislation.

On the back of that result, Mr McGowan said his Government would look at electoral reform.

Labor has long complained about the Upper House malapportionment, with as many MPs coming from regional WA as from Perth despite the metropolitan area being home to a large majority of the state's population.

But that even split of members is the direct result of a deal between Labor and the Greens in 2005.

Greens MP Alison Xamon said her party now supported a one vote, one value system.

"We support one vote, one value but we also want to support the voice of regional Australia," she said.

"The Greens are always open to talk about how we can do governance better and certainly open to having discussions with the Labor Party about how we might want to look at reforms of the Legislative Council."

Ms Xamon said the Greens also wanted to abolish group voting tickets, in a reform adopted federally ahead of last year's election, in a bid to reduce the chances of minor parties getting elected with a fraction of the vote.

"What we've seen emerge over the last few years is blatant rorting of the group ticket system," she said.

McGowan attacked over 'grubby little deal'

But any attempt to reform the Upper House voting system, would also be met with opposition, with the Nationals saying they would stand strongly against anything that would reduce regional representation.

"I think Mr McGowan needs to deal with the hand he's been dealt, which he created in a grubby little deal that was done back in 2005," Nationals leader Mia Davies said.

Liberal electoral affairs spokesman Peter Collier also attacked Labor for talking about the possibility of electoral reform.

"He is talking about reforming an upper house system that his party created, give me a break," he said.

Electoral Affairs Minister Bill Johnston said the Government had no imminent plans for change, but would consider it.

"The result stands for itself and everything needs to be reviewed after the end of the election and we will have a look, but we don't have any plans at this stage to take any action," he said.