As house prices have soared in the inner city so has the vote of the Greens.

The Greens have managed to win two inner city seats, Melbourne and now Prahran.There are worrying signs for Labor in once-safe seats of Richmond, Brunswick and Northcote where the party's primary vote continues to slide, while the Greens, without a huge campaign effort, continue to make ground.

Since 2006, the Greens have made gains in the inner city seats at Labor's expense.

In Richmond, new Planning minister Richard Wynne's primary vote was 46.4 per cent in 2006, at the 2014 election his primary had dropped to just 33 per cent.