The Treasury has still not explicitly said it will prevent homeowners from using Government-backed mortgage guarantees to buy second homes, after ITV News exposed the loophole. It is also feared the cost of the scheme could be passed onto borrowers.
The FTSE 250, which contains most the main housebuilding firms, bounced a bit after the Budget measures were announced.
But one property firm told me that help is needed now - and by January the mortgage and housing markets could have completely changed.
George Osborne faces criticism that his mortgage guarantee plan might actually make houses less affordable.
The Treasury has still not explicitly said it will prevent homeowners from using taxpayer-backed Mortgage Guarantees to buy second homes.
It opens up the possibility of buying a house to millions who don't have a deposit but they might have to pay more for the privilege.