I find house prices interesting, because it isn't just down to wages; it's down to other things, as well. The banks' role in it, I find interesting because it isn't much talked about.
I knew a couple who bought their first house for £300 in the 20s. They had to have minimum 10% (£30 deposit). They didn't have that, but were able to borrow £5 from their parents. They could also only borrow 3x salary, and he earned around £100, less than the national average. Even if the wife had been working (she had 2 small children), then they wouldn't have counted her salary in the calculations.
So what happened?
In the case above, he earned around £100. The maximum they could borrow was £300, and then they'd have had to have £30 deposit.
So the maximum house they could have bought was £330.
Once banks took the 2nd wage into consideration, let's say she was earning half him, they could have borrowed £450, assuming they could get a £45 deposit.
So the maximum house they could have bought was £495.
Then banks started lending more times salary, and requiring less deposit. If we say 8 x salary, and a 100% mortgage.
Then they could have bought a house costing £1200-approximately 4x the first example)
So looking at that, it looks ever so nice that they can buy a much nicer house.
But it isn't as simple as that, because everyone else can also have 2 wages, 8x salary. So then the house that was at £330, suddenly there's the same people who have £1200 to spend, but the same houses for sale. So vendors ask (and get) more money for houses.
Person A is selling their house, and last year it went for £300, this time they put it on for £400 but someone wants to make sure they get it, so they offer over at £440.
Person B sees that and decides to put their identical one on the market. The estate agent sees the other house went for £440 so they put it on for £450... and that's one way how prices get pushed up.
As with anything, you get winners and losers. The winners are the people who get on the chain early, and gain from the first bank increasing the amount they can borrow. And everyone thinks how wonderful it is that it's easier to get a mortgage and buy a house.
But once it's standard thing, then it doesn't increase house ownership because the prices just rise to reflect that the same people have more money.