The rise of London's skyline shows no sign of abating, with a total of 436 tall buildings now planned or under construction according to a new report. The number of buildings over 20 stories high in the pipeline has increased from 263 last year and 230 the year before, with housing a major driving force.

Indeed the annual report, from think tank New London Architecture and property consultants GLHearn, indicates that 73 percent of the tall buildings currently proposed are primarily for living accommodation. A significant number are also said to form parts of wider masterplans, in which multiple towers are arranged in clusters.

"London is in the middle of a population boom that shows no sign of slowing down and it's important we look at a range of options to achieve both the housing- and work-space need," says Deputy mayor of planning Sir Edward Lister. "Tall buildings can play a role in meeting some of that demand and the mayor has ordered a strategic approach to securing the world-class architecture of the capital's skyline to ensure they sit well in their surroundings and are of the highest standards possible."

The report defines tall buildings as those with 20 floors or more. It notes that 94 tall buildings were submitted for planning over the last 12 months, up from 72 in the 12 months prior to that. In addition, the number of tall buildings under construction has risen from 70 to 89. A further 233 tall buildings have planning approval but are not yet under construction and 114 are at the planning or pre-application stage.

Tower Hamlets and Greenwich are the two London boroughs cited as having the most tall buildings proposed, with 93 and 67 at the planning or pre-application stages respectively. The City of London (London's financial district) is also expected to see a number of additions to its existing cluster, with the proposed 1 Undershaft to become the tallest building in the City and a new design for 22 Bishopsgate also tabled.

According to the report, the average height of London's planned new tall buildings is around 30 stories, with around 60 percent of those planned between 20 and 29 storeys. Only eight buildings are said to have 60 stories or more.

Despite the large and accelerating number of buildings proposed, the report indicates that only 19 tall buildings were completed over the last year – up from six in the previous year.

The report has been published ahead of the major MIPIM property developer event that takes place in Cannes, France, from 15-18 March.

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