POST WITH CORRECTED FIGURES:
Omega 3 - "but does your inference that all immigrants get allocated social housing have any truth to it?"
I have never inferred any such thing!
As you may have seen in other threads, I have posted precise details of the impact that immigrants are currently having on social housing.
According to statistics presented in the EHRC study "Social housing allocation and immigrant communities", which was carried out essentially to try and debunk the "urban myth" that immigrants can "jump the queue" for social housing, immigrants are not formally eligible for social housing until they have been resident for five years.
However, around 11% of immigrants who have been resident in the UK for less than five years DO live in social housing, because of some special circumstance that overrides the normal eligibility rule (e.g. they may be asylum seekers).
So, the argument that is often put forward by those defending immigration, implying that because immigrants don't qualify for social housing they can't be putting any pressure on it, is simply not true.
According to the latest quarterly long-term migration statistics, the total long-term immigration to the UK in the year to June 2011 was 593,000, of which 505,000 were non-British and 88,000 were British citizens. A large proportion of the 505,000 are students who will stay for a few years of study then return home. This outward migration of returning students at the end of their courses, plus a few other migrants who also decide to return home again, makes the net annual migration figure around 250,000.
Every one of these extra residents requires somewhere to live, and on average 11% of immigrants are allocated social housing within the first five years after their arrival, with the percentage of immigrants living in social housing rising to 18% in the longer term.
On the basis of these numbers, social housing is being taken up by newly-arriving immigrants at a rate of over 30,000 a year. A further 25,000 immigrants who have been resident for longer than five years (thus making them eligible for social housing) also move into social housing.
Assuming an average household size of 2.5 (higher than the UK average) that means that immigration at its present rate would be 'consuming' social housing at a rate of around 22,000 units each year.
According to the DCLG report linked above, the number of new housing completions for Housing Associations and Local Authorities has been running at a mean of 22,500 a year over the past 20 years.
That indicates that immigration at its present level, with the current rate of allocation to immigrants, is effectively cancelling out all social housing construction.
Or, to describe it in another more contentious way - in numerical terms virtually every new social home being built would appear to be taken by an immigrant household.
The rest of the immigrants also require housing, so they go into the private rental market (64%) or become home owners (17%).
These additional households increase the demand for open market housing too, and as we all know increased demand leads to higher pricing, reduced housing choice and reduced housing availability. According to the DCLG report, private housing completions have been under 90,000 a year for the past two years.
At an average household size of 2.5 (larger than the UK average) the extra housing required by immigrants would be 100,000 a year. So again, in numerical terms every new house currently being built is needed to be able to accommodate the number of immigrants arriving each year.
So, there is no way that immigration can be seen as a positive thing for any aspect of housing supply in the UK, either private or social.
I don't know where you got your figure for emigrating British residents from, because it is somewhat exaggerated. According to the latest figures for YE June 2011, 143,000 British residents emigrated and 88,000 returned here from overseas, making the net emigration figure 55,000.