View source for Seventy Wilson, London

==[[Structural_steel_design_awards|Structural Steel Design Awards]] 2018 - Merit==
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A 1980s [[Multi-storey_office_buildings|office building]] has been fully refurbished and now benefits from a 25% increase in floor area. The space has been rationalised and two new storeys have been added, all with an efficient [[Design|structural design]] dramatically reducing the [[Life_cycle_assessment_and_embodied_carbon#What_is_embodied_carbon.3F|carbon footprint]]. 

The works involved extending the height of the building from five to seven storeys, building a four-storey addition to one elevation and remodelling the circulation [[Concept_design#Concrete or steel cores|cores]] to provide more office space and an additional lift.

The exposed [[Braced_frames|steel frame]] in this modern ‘raw’ building is painted bright red to emphasize and celebrate the structure.
 
{|class="wikitable" width=400px 
|-
|'''Architect'''||astudio
|-
|'''Structural Engineer'''||Heyne Tillett Steel
|-
|'''Steelwork Contractor'''||TSI Structures Ltd
|-
|'''Main Contractor'''||Willmott Dixon
|-
|'''Client'''||Stanhope
|}

==Judges' comment==
The team cleverly added 25% floor area to this 1980s office without needing to strengthen the existing steel structure. The original steelwork, previously encased in concrete, was exposed to make it a statement of the building. This two-storey extension is a fine example of how testing and good engineering can give a steel building new life.

[[Category:Case studies – Multi-storey office buildings]]
[[Category:SSDA]]