I agree with HomeBuyerStrike.
Did I just say that out loud?
LOL
Those spare rooms will start to fill up, and its happening already. Its exactly what you'd expect when there is a supply shortage and high rental and purchasing costs. Like others have said, when demand is increasing through population growth and supply isn't keeping pace, price has to rise. Its the most simple of economics demand/supply curves. There is no option.
BUT, if prices are at the limit of affordability in some areas then the only options are to:
1. Earn more money.
2. Pool with others to buy.
3. Pool with others to rent.
There's a lot of people already working on option 1. You see it whenever affordability gets tight. People taking on that extra job to keep that roof over their head. And option 2 can be as simple as sending the missus back to work so you've got dual incomes like we just did. We needed the improved servicability for our development so my wife just went back to work now my boy is 5. The extra $80K a year will really help.
And, option 3 is actually really common too. My IP in Narrabeen was let to 4 young guys who all lived together and split the $750pw rent between them. They moved out a month ago and it was re-let at the first open for $800pw to three young professional girls. You're on another planet if you think shared rentals won't be on the increase. All those GenYs who want to move out of home but can't afford $800pw themselves will pool with mates.
I don't understand the issue. This will just force rental yields up to where they need to be based on current prices. When they go far enough, prices will kick off upwards again.
That property of mine in Narrabeen is yielding 4.5% which isn't too shabby for something worth a touch under a million.
Happy days as an investor.
Cheers,
Michael