TBC.London Reuses 1930s Structural Steel in Major Commercial Circular Retrofit
Structures · Construction methods · Low-carbon materials
The TBC.London retrofit incorporated approximately 40 tonnes of 1930s structural steel reclaimed from an Oxford Street building, blending it with new steel to adapt an existing concrete frame. Material verification required destructive and non-destructive testing under guidance for pre-1970 steel, achieving an embodied carbon rating below 300 kgCO₂e/m² for modules A1–A5.
In London's Tower Bridge Conservation Area, the TBC.London commercial development retained and adapted an existing concrete frame using structural steelwork to reconfigure cores and construct new floorplates. The project incorporated roughly 40 tonnes of reclaimed 1930s steel salvaged from a former department store on Oxford Street, making it a pioneer in pre-war structural steel reuse at commercial scale in the UK. According to structural engineering firm Webb Yates, incorporating century-old steel during ongoing construction required reassessing designs without altering spatial or performance specifications. Because the salvaged sections lacked contemporary certification, engineers subjected them to tensile, chemical, metallographic, and carbon-equivalent-value tests, applying guidance for pre-1970 steel reuse to verify load paths, tolerances, and custom connection detailing. In addition to the 40 tonnes of reused steel, the scheme utilized 600 tonnes of new steelwork with at least 56% recycled content. The project reported modules A1–A5 whole-building embodied carbon below 300 kgCO₂e/m² and secured BREEAM Outstanding (95.6%), WELL Platinum, and NABERS 5-star ratings. Experience gained from verifying and integrating the historic steel also prompted the launch of the Engineers Reuse Collective in 2024 to share technical practices across the industry.
Key takeaways
- Approximately 40 tonnes of 1930s steel reclaimed from Oxford Street were incorporated into the TBC.London commercial retrofit alongside an adapted concrete frame.
- Because the century-old steel lacked modern certificates, engineers conducted tensile, metallographic, chemical, and carbon-equivalent tests under pre-1970 steel reuse guidance.
- The project specified 600 tonnes of new steel with at least 56% recycled content, achieving whole-building embodied carbon under 300 kgCO₂e/m² for modules A1–A5.
- Technical lessons from testing and fabricating the reclaimed steel led to the 2024 establishment of the non-profit Engineers Reuse Collective.
Source：Construction Management Read the original ↗
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