Lessons from Southgate House
Refurbishment works within occupied tower buildings present a unique set of challenges. Whether in commercial offices, educational estates, or mixed-use environments, live buildings demand careful planning, clear communication, and rigorous safety management to ensure successful delivery with minimal disruption to daily operations.
Our recent CAT A refurbishment at Southgate House in Cardiff demonstrated this well. A multi-storey office tower, fully occupied, with people working above and below the floors we were refurbishing. The building had to keep functioning throughout.
A live tower refurbishment environment
We were appointed to strip out and refurbish multiple floors – the 5th, 7th and 11th- in a building occupied across several levels, with tenants working both above and below our active construction zones. This meant every decision about timing, sequencing and access had to account for the people using the building.
All disruptive works were carefully sequenced and programmed, including out-of-hours demolition and drilling, early morning and evening working windows, and weekend operations where required. These aren’t just programme logistics; they’re about making sure people can actually work during the day without impact drills overhead.
Working safely around occupants
One of the more complex aspects was installing new building services that required us to work within and pass through occupied floors. Routing new HVAC pipework vertically through service risers, core drilling within occupied suites, installing AC infrastructure and fire stopping. All whilst people were at their desks.
We also installed new fire alarm communication cabling, routing systems back to the main fire alarm control panel in the ground floor reception. When you’re working on life-safety systems in an occupied building, there’s no room for error.
The approach required advance notifications, escorted access arrangements, protection measures to occupied spaces and strict permit-to-work controls. These procedures ensured life-safety systems remained fully operational whilst upgrade works progressed.
Logistics in constrained tower buildings
Tower refurbishments in city centres bring their own constraints. At Southgate House, we had access through the main reception and passenger lifts. There was no dedicated laydown area, and fire escape stairwells became our route for larger materials.
Every delivery and waste removal needed pre-planning and time control to avoid peak building use. Skips were placed on the public highway under council permits, with full segregation, hoarding, and pedestrian safety controls to protect the public realm. These constraints don’t make projects impossible; they just require more thought up front.
Delivering modern, sustainable environments
Beyond logistics and phasing, the refurbishment delivered fully modernised CAT A accommodation, incorporating updated lighting and mechanical systems focused on energy efficiency, automation and sustainability.
This included new VRF heating and cooling systems, LED lighting with intelligent controls, upgraded fire alarm infrastructure, and enhanced power and data distribution. These upgrades significantly improved environmental performance, occupier comfort and long-term operational efficiency.
Managed through integrated project delivery
The scheme was delivered under a fully integrated Design & Build model, managing design coordination, engineers and specialist subcontractors, compliance and certification, and health and safety in a live building environment.
Key compliance outputs included NICEIC electrical certification, BAFE fire alarm approvals and Building Control sign-off, ensuring a fully compliant, tenant-ready handover.
What makes these projects work
Projects like Southgate House reinforce what we’ve learnt over years of working in live environments. Early stakeholder engagement matters. Detailed phasing strategies that account for how people actually use the building matter. Robust logistics planning matters. Out-of-hours working capability that doesn’t just exist on paper but actually happens matters.
The technical delivery has to be right, but so does the coordination with everyone using the building. By combining technical expertise with live-environment planning, refurbishment works can be undertaken safely, efficiently and with minimal disruption.
