St. James’ Square – London



Architectural Detailing



Blou construction , Propak, Edmonds, ADS Joinery, Paye Stone, Richardon’s Roofing

Total Build Cost

£ >20m

We worked with the contractor to deliver the thermal, airtightness and leadwork design packages on this project in St James Square, London. It involved the retention of the listed façade and complete demolition and redevelopment of the internal structure to provide new commercial and office space.

As part of their construction works, we were employed to develop the overarching architects’ work as part of the Contractors Design Portion for the Thermal envelope. It included detailing of the walls to provide an insulated and air tight box to meet building regulations. This work included coordination with the existing historic fabric, meeting the needs of the structure (which had already been inserted into the building prior to our appointment) and ensuring that the fire stopping was feasible within the spaces allocated. Within this work, we also undertook interstitial condensation and U-Value calculations to ensure the building performance was met as part of the final SBEM calculations.

Coordination of the thermal and airtightness and detailing with fire, structure, retained façade and the original architects design intent around the doors and windows, floors and ceilings was complex. Although it was a worthwhile and rewarding challenge which enabled the architects’ vision and the building’s history to both be intact.