Mr English said the move was temporary due to technicalities of relevant legislation but the Government would ultimately like to make it permanent.
Video: Budget 2014: Brian Fallow's analysis
He defended it as "another step yet a significant one" in what he said had been a three year programme which would run for a further five years, "to allow more New Zealanders into a housing market where they're shut out mainly by poor planning."
But Mr English said the biggest factor affecting home affordability was interest rates.
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"The best thing that Government can do is limiting its own spending to take pressure of those rates."
He warned a Labour Greens Government with less disciplined spending could push interest rates to over 10 per cent, which for those wanting to buy their first home, meant "their dream is dead".