From The Guardian:
… the Morgan Stanley report, headlined “The help to buy premium – and its unintended consequences”, drily unpicks the data, revealing how the beneficiaries have been the major developers.
Researchers compared the price of new-build houses in 2013, when the scheme began, with the price of existing or “second-hand” houses. There has always been a small premium for new-build; people will pay extra for spanking-new kitchens and bathrooms. But since 2013, that premium has rocketed.
“The divergence between new-build and second-hand prices is higher than it’s been since records began,” says the report. It says that the price of new-build has outstripped second-hand by 15% since the start of help to buy. “We are now around 5% points away from the level at which new-build prices have diverged by the full amount of the government’s equity loan (20% of house price across England).”
I suppose it's possible that for every £100 of HTB subsidy, homebuilders get more than £100.
Let's say there are 10 new homes with an original price of £100 each, now inflated to £115.
There's £100 of subsidy on offer.
Four of the new homes are bought by people using an HTB to loan, i.e. £25 each.
The other six new homes are bought without HTB.
The builder actually makes an extra profit of £150, being 10 x £15.