Linear infrastructure overbuild guide

In November 2018 WSP published Out of thin air – building over London’s rail lines , which identified the potential for creating overbuild sites for as many as 250 000 residential units (100 m2 per unit) in London. The supporting analysis was rigorous and based upon several general assumptions. Subsequently WSP published an update in 2019. Following the publication of the first report, the Buildoffsite Rail Hub decided to look at how offsite methods could be used to maximise this opportunity, with the objective of making such projects more interesting to a wider range of developers and offsite construction specialists. The result is this collaborative piece of work with contributions from numerous Buildoffsite members, with different industry leaders providing each chapter. This guide aims to help industry practitioners understand the challenges of overbuild projects and plan them more effectively, with more confidence in the outcomes, hopefully bringing the viable size of projects down.