A report was commissioned by the Office of the Deputy Prime Minister to give independent advice for the examination of the draft South East Plan expected in November.
Assembly Chairman Keith Mitchell said 'These figures are pure fantasy. There is no clear evidence base behind the figures or the way they have been allocated across the region.'
'In contrast,' he added 'we have devoted more than two years to ensuring our plans are practical and deliverable, balancing the need for homes with environmental concerns and ensuring a high quality of life.'
Mitchell continued, 'Strong technical work and the country's largest regional planning consultation mean we have built a high degree of consensus behind the South East Plan - it is disingenuous of the Government to try to counter our democratic decision because they do not agree with it.'
Mitchell described the Government's report as 'back of the envelope stuff compared to the robust evidence base developed by the Assembly.'
'With the support of public opinion too, I am confident that we will have the strongest case at November's Examination in Public.'