The London Datastore publishes GLA Population Projections 2012 Round, Trend Based, Borough SYA annually in December.
It forecasts that the borough population will rise from 188,000 in 2011 to 225,000 in 2041 [20 %]. Greater London?s population will rise from 8.2 million to 10.5 million [28 %]. Hounslow?s will rise from 255,000 to 335,000 [31 %].
It also publishes GLA 2012 Round Population Projections: Intelligence Update 05-2013 which explains the methodology and the difference between this trend-based forecasts and the one based on a forecast of housing supply, the Strategic Housing Land Availability Assessment [SHLAA].
The SHLAA-based forecast for Richmond is a lot lower: 203,000 in 2041 [+ 8 %].
They write [p. 11]:
. . The SHLAA is much lower than the trend-based projection for many Outer London boroughs, but higher for a band of Inner and East London boroughs. Comparison of the SHLAA-based projections and the assumed development trajectories confirms the expected correlation between development and projected growth.
Where population growth is significantly higher in the SHLAA-based projection, growth can be thought of as being driven by new development. Conversely, where the trend-based projection is significantly higher, recent trends in population change outstrip the modelled capacity for further population increase. In these cases, it can be argued that increased pressure on housing could lead to increasing household sizes. This, in turn, would suggest that the existing SHLAA projection is excessively conservative and a more likely outcome may lie somewhere between the two projections.
The trend-based forecast of borough births falls from a peak of 3000 in 2010 to 2700 in 2017 and a minimum of 2600 in 2034 rising to 2700 in 2039. Hounslow?s births will peak at 4800 in 2014, then fall to 4600 in 2020 and rise again to 4800 in 2039.
London, which seems over-crowded already, is set to become a lot more crowded year by year - more like a third world capital in fact.