Refurbishment of a Commercial Building with Single Level Basement and PiledFoundations for a 70% Increase in Floor Area and Structural Carbon Rating Scheme (SCORS) "A".Â-PPT Presentation

PPT Presentation

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The presentation describes the redevelopment of One Triton Square through the reuse and extension of its existing structure. The project responds to a new planning context and the client’s sustainability ambitions, while making use of the building’s generous stairs, high loading capacity, spare structural strength, extensive records and existing basement.<br /><br />The proposal adds three to eight storeys, increasing floor area by around 70%: from 19,100 m² to 32,100 m² (30,800 m² to 47,300 m² gross). Existing provision for plant space is maintained. The added floors require new load paths and structural interventions, including piles, a new raft and strengthening or replacement of columns.<br /><br />The construction sequence involves stripping out the building, installing monitoring, piling within the basement, removing further slabs, strengthening the existing structure, connecting new work to retained piles, and constructing the new raft, pile caps and superstructure. Careful detailing is needed to connect the new foundations and structure to existing elements, while managing groundwater.<br /><br />Reuse is central to the project’s environmental performance. Approximately 35,000 tonnes of concrete and 1,900 tonnes of reinforcement and structural steel are reused, with cement replacement of up to 70% (about 65% on average). The structural embodied carbon is estimated at 6,400 tCO₂e—390 kgCO₂e/m² for the new floor area and 136 kgCO₂e/m² across the refurbished building, compared with a cited benchmark of 350 kgCO₂e/m².<br /><br />The project demonstrates how coordinated design and collaboration across the client, insurers and project team can extend an existing building’s life while substantially increasing its capacity and limiting embodied carbon.

Keywords

One Triton Square

redevelopment

reuse

extension

embodied carbon

structural strengthening

sustainability

retrofit

piling

concrete reuse