How to decarbonise a live public building without disrupting operations

The question that usually sits behind most early conversations is how the building continues to operate while the work is being carried out.

On public sector sites especially, shutting down completely is rarely straightforward. Schools have term times to work around, leisure centres run on memberships and bookings, healthcare environments operate continuously, and housing is obviously occupied. That operational reality shapes the way the project is approached long before the plant is selected.

A useful starting point is to understand how the building runs across a typical year. Not just technically, but practically. When are the busiest periods? Are there holiday windows? Are there planned maintenance weeks already in the diary? Even small shifts in occupancy can create opportunities for more intrusive works to be scheduled carefully.

Sometimes there is a clear window where changeover activity can take place with minimal impact. In other cases, there isn’t really any gap at all, and the project needs to be planned around the building remaining live throughout. Knowing which of those scenarios applies early on makes a significant difference to how the programme is structured.

Once that operational picture is clear, sequencing becomes the main focus.

Wherever possible, enabling works are carried out while the existing heating system is still running. Electrical upgrades, groundworks, plant bases, pipe routes and preparatory civils can often be separated from the final plant replacement. Taking that approach reduces the pressure that would otherwise sit around the changeover itself.

There’s often a perception that the switchover is the most disruptive part of the job. In practice, it tends to be relatively contained, provided that the groundwork has been handled methodically beforehand. If electrical capacity has already been upgraded and distribution routes prepared, the removal of old plant and introduction of the new system becomes a planned technical step rather than a compressed logistical exercise.

On larger estates, the sequencing isn’t always linear. It might make more sense to prepare one building fully while another continues operating as normal, or to phase works around occupancy levels rather than simply moving geographically across the site. The order is shaped as much by how the buildings are used as by their physical layout.

Access is another consistent consideration.

Working in a live environment means managing deliveries, lifting operations and storage space carefully. Parking may already be limited. Other contractors might be operating in parallel, particularly on funded projects where insulation, lighting upgrades or solar PV installations are happening alongside heating works. Coordination across trades becomes as important as the installation itself.

Occasionally, something is uncovered that requires the programme to pause in a specific area. In older public buildings, asbestos is not unusual. When that arises, it is assessed properly and dealt with through the appropriate process before works continue. If any part of the design needs adjusting as a result, that is reviewed and agreed before proceeding. Maintaining control of the sequence is more important than maintaining speed.

Clear communication underpins all of this.

Facilities teams need to understand what is happening and in what order. Site managers need visibility of timings so they can plan around them. Building users generally want reassurance that essential services such as heating and hot water will remain available throughout the works.

When that sequencing is visible and expectations are managed early, the project tends to settle into a steady rhythm rather than feeling disruptive.

We delivered a leisure centre project recently where the building stayed open throughout. Parking was limited and other energy upgrades were taking place at the same time, including insulation improvements and solar PV installation.

From a heating perspective, the system itself wasn’t unusual. What required most attention was everything around it – access, coordination with other contractors, and sequencing around how the building was being used.

The aim was simply to complete the work while the centre continued operating as normal.