As the UK charts its course towards a legally binding net-zero target by 2050, the built environment presents both a challenge and an opportunity when it comes to making progress. The built environment accounts for almost two-fifths of global carbon emissions and has an important role in propelling progress towards net zero – particularly given that the Climate Change Committee’s new report points to the inadequacy of the UK’s preparations for climate change.
Ultimately, every new development and retrofit project is a pivotal moment to lock in low-carbon performance and enable progress – provided we wield the right tools.
The power of whole-life performance modelling
Whole-life performance modelling (WLPM) transforms design from art, intuition, and good intentions into a data-driven science that drives environmental and financial benefits. By simulating every aspect of a building’s lifecycle from design and construction through to operation, WLPM enables teams to make decisions about measures such as HVAC systems and electrification and occupant comfort across seasons – and the impact that these have on building costs, energy usage, and carbon emissions.
With these insights, stakeholders can optimise building designs and retrofit projects for real-world performance, not just theoretical standards.
Virtual trials of emerging building measures
Whether you are weighing the merits of air-source heat pumps to help navigate the UK’s damp winters or rooftop solar panels under Greece’s sunnier skies, WLPM provides a virtual testbed before building designers, owners, and operators decide on the measures to take. This type of modelling enables decision-makers to:
- Compare options side by side in consistent scenarios
- Assess interactions between different measures, such as renewables, thermal storage, and building fabric
- Evaluate upfront investment against long-term operational savings and carbon reductions
- Replace guesswork with simulation, enabling projects to proceed with confidence
Weighing complex trade-offs
Of course, design and retrofit decisions invariably involve trade-offs – whether that means looking at insulation levels, glazing choices, electrification, or other measures. Dynamic tools let engineers and designers:
- Run “what-if” analyses that examine comfort, cost, and carbon metrics
- Explore sensitivity to fuel prices, occupancy changes, and extreme weather circumstances
- Identify optimal solutions that balance budgetary and sustainability goals
The cost of failing to compare
In 2025, whole-life performance modelling has real-life business implications for building professionals that go beyond environmental impact. This could look like a future of inflated energy bills, a need for expensive retrofits to rectify underperformance, or even reputational damage when buildings fail to meet net-zero pledges.
Early adoption of advanced modelling technology brings the evidence and yields buildings that perform better from day one, reducing operational emissions and lifecycle costs.
Case in point – deploying digital twins for Dublin City Council
IES created a digital twin of three social housing blocks, originally built in 1962, in Dublin, on behalf of Dublin City Council. The aim was to assess the full carbon impact and efficiency of four potential renovation strategies and discern the best way to reduce carbon emissions from these decades-old buildings.
After modelling each potential scenario in detail using IES’s digital twin technology, deep retrofit was selected as the best option to optimise the whole-life carbon of the buildings. The analysis identified that over a 60-year life period, each residential block can achieve around an 85% reduction in cumulative emissions through this strategy – proving the value of investing in the evidence before executing the measures.
Designing for net zero from day one
As discussed, decarbonisation starts at design, but it must continue to be put into practice throughout a building’s entire lifecycle. Whole-life performance modelling provides the clarity needed to make bold, data-driven decisions that reduce lifetime costs, enhance comfort, and slash operational emissions – enabling adjustments to be made along the way to ensure benefits are realised. As the UK accelerates towards its 2050 net-zero goal, harnessing advanced digital twin and simulation tools will be key to creating a built environment that treads lightly on our planet – today and for generations to come.
Find out more about whole-life performance modelling at IES’s website: https://www.iesve.com/