This Government (possibly even more than the New Labour shower) are artificially inflating house prices. Even if they wanted to build houses to meet demand, they wouldn't, as this would depress prices.
This is due to a combination of factors, that include self-interest (the high proportion of BTLers and multiple home-owners in Parliament; the greed of baby-boomers and the associated levels of expected inheritance; and the sources of funding of the main political parties).
Osborne has succeeded in making it appear the UK economy is growing rapidly thanks to three factors; immigration (unorganic population growth), unsecured borrowing and property inflation. All these contribute to growing total GDP figures, without actually resulting in any more 'real' money per person.
The truly frightening thing is that this recipe for GDP growth is demonstrably and unarguably destined for failure. Not only is it unsustainable, but it is increasingly precarious.
As much as Osborne et al like to use the word 'investment' to describe foreign buyers snapping up prime London property to keep it empty, it is anything but. Much like the obssession with selling the family silver to foreign companies (Cadbury's, anyone?), the initial purchase appears on the books as 'investment', but any subsequent profits are rapidly sent offshore, usually to tax havens.
The current house-price scam is a bubble by every historical measure, and we will have to face a painful correction. It's a symptom of our imbalanced and unsustainable economy, and will fall along with the rest of the house of cards.
I say this as someone who owns a property in a leafy inner London suburb, so it's not from a position of blinkered self-interest.