The move comes as construction union Ucatt staged a demonstration outside the developer’s head office in the capital today.

Union officials claimed that workers on some Land Securities sites were paid just £7 an hour – well below the London Living Wage of £9.15 an hour.

Jerry Swain, Regional Secretary for Ucatt London and the South East, said: “The London Living Wage is the minimum that workers need in order to live in London.

“Ucatt will continue protesting until this commitment is made.”

A spokesperson for Land Securities said: “We pay Living Wage to our directly employed staff and London Living Wage to full-time service partner staff in our London managed office portfolio.

“London Living Wage is not currently a compulsory part of our tender process, but we work closely with our contractors to raise awareness of the Living Wage as standard.

“In partnership with our contractors we’re making positive progress – for example, during the construction of Trinity Leeds we monitored wages against National Living Wage rates and were pleased to find that most workers both on and off site were paid above that level, and we rectified the few instances where this wasn’t the case.

“However,  the construction supply chain is complex so further investigation is required before taking a position on how we should support, encourage, or enforce specific wage rates upon our contractors.”