NHS estates teams are facing a difficult challenge.
They need to keep ageing hospitals safe and operational, reduce carbon emissions in line with NHS net-zero commitments, and do all of this while managing significant financial pressures.
Traditionally, retrofit conversations have focused on measures such as insulation, glazing upgrades and other building fabric improvements. These projects can play an important role in long-term decarbonisation, but are they always the best place to start?
Analysis by Schneider Electric and JLL indicates many organisations may be overlooking some of the quickest and most cost-effective retrofit opportunities available.
Their analysis of seven hospitals worldwide found that, in many cases, some of the fastest and most cost-effective energy and carbon savings came not from major construction projects, but from improving how buildings are monitored, controlled and operated.
Hospitals have a different energy challenge
Unlike offices or commercial buildings, hospitals operate around the clock.
Energy consumption is driven not only by heating and cooling, but by ventilation systems, clinical equipment, IT infrastructure and the demands of maintaining safe healthcare environments 24 hours a day. As a result, a hospital’s energy performance often depends just as much on how systems are operating as on the building fabric itself.
For estates teams, that presents an opportunity to reduce energy consumption without necessarily starting with major capital works.
Many hospitals already have Building Management Systems (BMS), meters and control infrastructure in place. However, these systems are not always fully optimised or used to their full potential. Improving visibility and control can reveal inefficiencies that would otherwise remain hidden.
Measures such as BMS optimisation, advanced metering, occupancy-based controls, continuous commissioning and real-time performance monitoring can help estates teams identify where energy is being wasted and respond quickly.
The case for an optimisation-first approach
The study assessed nine different Energy and Carbon Conservation Measures across seven hospital sites, evaluating them against three key criteria:
- Energy savings
- Financial return
- Whole-life carbon impact
One finding stood out.
A relatively straightforward package of digital and operational improvement measures consistently delivered strong results across multiple hospital environments. This “core retrofit bundle” achieved:
- Up to 18% energy reduction
- Return on investment in under five years in most regions
- Whole-life carbon payback in less than one year
For NHS Trusts working within tight capital budgets, that is a compelling result.
Rather than waiting for large-scale building projects, estates teams may be able to unlock significant savings from existing infrastructure first.
Looking beyond financial payback
Energy savings tend to dominate retrofit business cases, but carbon performance is becoming an increasingly important consideration.
Many traditional retrofit projects involve significant construction activity and material use, creating substantial embodied carbon before operational benefits are realised.
Digital retrofit technologies often tell a different story. Because they typically require less material and can be deployed quickly, they combine low embodied carbon with meaningful operational savings.
In several scenarios assessed in the study, carbon payback was achieved within a matter of weeks rather than years.
For organisations under pressure to deliver measurable progress towards net-zero targets, that speed of carbon payback is hard to ignore.
Four reasons retrofit programmes underperform
The research also highlighted several common challenges that can reduce the effectiveness of retrofit programmes.
1. Starting with fabric first
Investing in fabric improvements first can sometimes mean committing significant capital before fully understanding how efficiently existing systems are operating.
2. Treating projects as standalone initiatives
The strongest outcomes were achieved when multiple technologies worked together as part of an integrated strategy rather than as a series of isolated projects.
3. Overlooking operational improvements
Activities such as BMS tuning, recommissioning, and ongoing performance monitoring can often deliver meaningful savings without major disruption to clinical services.
4. Ignoring embodied carbon
Looking solely at operational energy savings risks overlooking the embodied carbon impact of retrofit choices. Whole life carbon considerations are becoming increasingly important when evaluating long-term sustainability outcomes.
Where should NHS trusts start?
If estates teams are beginning or revisiting their decarbonisation plans, the evidence points towards four practical priorities:
- Optimise existing Building Management Systems
- Improve energy monitoring and metering
- Introduce occupancy-based controls where appropriate
- Establish a process for continuous commissioning and performance review
These measures typically require less capital, can be implemented more quickly and cause far less disruption than major construction projects.
From fabric-first to a balanced approach
The findings do not suggest that hospitals should abandon fabric improvements. Far from it.
The key takeaway is not that fabric upgrades are unnecessary, but that organisations may achieve better results by optimising first and investing in larger upgrades later.
By first understanding how buildings are performing, improving visibility and optimising existing systems, NHS Trusts can often capture immediate savings while building a stronger business case for future investment.
That approach can deliver:
- Faster energy reductions
- Earlier carbon savings
- Greater operational resilience
- Better infrastructure visibility
- Improved occupant environments
- Stronger foundations for future electrification
In an environment where every pound of capital investment is scrutinised, finding the quickest path to measurable results is increasingly important.
For many NHS organisations, the most attractive retrofit opportunity may not be the next major capital project. It may be unlocking more value from the systems and assets already in place.
Read the full whitepaper
Download the Healing Healthcare Infrastructure whitepaper to explore the research findings in more detail and discover the digital retrofit strategies helping healthcare organisations accelerate their sustainability goals.
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