With most housing things, people like to blame everything else except for supply restrictions, you can also see this in the other replies to the comment you replied to. It's way easier to blame ghosts than it is for any politician to piss off the homeowner constituency.
It's (unfortunately) rational for politicians to respond to home owners, as they stay in one place for longer, and therefore are more likely to vote for you in the future.
But it's also significant infrastructural deficits (water and power) that are downstream of incredible debt taken on by the government as a result of the 2007 crash (as well as a planning system where dogs have the right to object to planning applications).
EDIT: It's fascinating that I'm downvoted for this. I wonder if the voters also live in Dublin?