Three years after members of the City of London’s planning and transportation committee voted to approve it, the Square Mile’s tallest building has finally won formal consent.

Eric Parry Architects’ 305m tall 1 Undershaft won the backing of committee members in November 2016, but the consent has only been formalised in a letter this month – giving site owners five years to start work on the project.

The 19-page consent letter for the 73-storey tower, signed by chief planning officer Annie Hampson, contains 47 conditions on which the consent is dependent – one of them a post-construction Breeam assessment confirming that an “excellent” rating has been achieved.

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