Around where I grew up in the south east many of my parents friends could afford a nice detached 4 bed house on one average wage and take early retirement.
Now even if you have a couple of doctors that work full time they can just about afford a 3 bed ex local authority house. Two people on average wages full time can just about afford a small flat, but thats at their peak earning power - how can they bring up a family?
I know it's cheaper up north, but there are less jobs there and it breaks familys and people apart if they have to move hundreds of miles away from where they have always lived. I've know people move and then regret leaving everyone behind and do want to move back.