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HVAC Retrofit at 1 Stephen Street: How WS Swift Delivered a Live Building Upgrade with Flame-Free Pipework

WS Swift, a specialist in HVAC system upgrades and mechanical pipework in London, has completed a live retrofit project at 1 Stephen Street — a landmark 265,800 sq ft office and retail building. The project involved upgrading the existing chillers to air source heat pumps as part of a drive toward more sustainable construction practices in London. Carried out while the building remained fully occupied, the retrofit required innovative solutions to meet both performance and safety requirements. Delivering a Live HVAC Retrofit in Central London Undertaking a large-scale HVAC retrofit in an operational building presents significant challenges, especially in London’s high-demand commercial property sector. WS Swift needed to avoid disruption to tenants, minimise installation time, and ensure safety on-site — all critical in a live building retrofit environment. By partnering with Victaulic, WS Swift adopted a flame-free pipe joining system, eliminating the need for welding. This method reduced installation time, removed the risks associated with hot works, and allowed for easy pipework modifications during phased commissioning. [...]

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