The Frederick Messer estate is a 66 unit residential development on the Frederick Messer Estate near Seven Sisters station in Haringey. The development consists of three six storey blocks fronting the seven sisters road. The lower blocks sit over the Victoria line tunnels which are approximately 15m below the surface.

CRE8 Structures are the civil, structural and geotechnical engineers for the development and have led the discussions with Transport for London (TfL) regarding the principles and details of building over. Ground movement analysis has been undertaken on the basis that a raft foundation will be used and have shown that the effect on the tunnels from the build over is to remain within tolerable limits. The ground investigation has also been agreed with TfL and carried out so that insitu soil data has been used in the impact assessment of the build over. Works will commence shortly.

The overall project is envisaged in reinforced concrete although opportunities for MMC are being explored on all buildings. The structural frame are to be of reinforced concrete with thin slabs and blade columns with stair cores used for stability. The foundations will be continuous flight augured piles founding in the London Clay strata. The floor slab thickness is being minimised to reduce building weight and to save material. The overall embodied carbon of the project is being monitored with the target of net zero being the aim.