One of the key challenges that Tier Consult faced on the project was how to successfully extend the frame of the existing building by three storeys. In order to do this, the team needed to carry out a detailed load assessment to determine what extra load the existing steel frame could carry.
The addition of the two new blocks at the rear of the building posed their own challenge as there was a part constructed basement that required partial demolition. However, the topography of the site required the existing wall to remain in an unpropped condition during the construction.
Careful consideration to the practical construction of the two new buildings had to be given as the courtyard would become fully enclosed upon completion of the buildings.
Other challenges included the existing substation on the site as it was required to be kept in operation, but new foundations were required to be constructed around it at a lower level. There was also a live sewer from adjoining properties across the site and negotiations with Yorkshire Water were needed so that the sewer could be relocated under a build close agreement.