80% of the buildings that will be occupied in 2050 already exist. This fact reveals the true significance of the current retrofit initiative, and the importance of ensuring our current housing stock is maintained to a decent standard. Bringing ageing housing stock up to date with current standards is a complex and nuanced task, and one that constantly demands new approaches and methods.
Digital twins introduce a potentially transformative tool to the retrofit process. Emerging technologies mean that potential retrofit works can be digitally mapped before any material works begin, and alleviate the element of risk that can become prevalent in large scale retrofit projects.
As the sector grapples with net zero targets, tighter regulation and heightened scrutiny of resident outcomes, unlocking efficiency is one of the top priorities of today, and Digital Twins are rapidly becoming a vital tool when it comes to future-proofing existing housing stock.
Why retrofit exposes the sector’s blind spots
Retrofit inherently comes with pitfalls, especially larger jobs that have to account for a diverse housing stock. Many homes were built decades ago, with incomplete records and layered adaptations over time. Even where EPCs and surveys exist, they often fail to capture how buildings behave in use, particularly once insulation, ventilation and heating systems interact.
This is where blind spots are liable to occur. Blind spots arise as multiple moving parts interact, and once the retrofit begins it’s common to find out that the reality on site is very different to the picture painted by historic records. Digital twins help reduce this risk by giving landlords deeper insight before work begins, and by testing assumptions before they are locked into physical interventions.
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A strategic view
Digital twins give organisations the opportunity to create a 3D map of how these moving parts interact. Through the use of in-depth simulations, landlords and local authorities can be given an eagle-eyed view of the housing stock in question, complete with status updates, performance reports and allowing for scenario-testing, before any real life works begin.
Different retrofit packages can be modelled virtually, comparing cost, carbon reduction and occupant comfort before any work is commissioned, supporting more strategic prioritisation across portfolios, rather than reactive, property-by-property upgrades.
This unique vantage point isn’t just valuable for planning before works go ahead, it remains as an evolving source of truth throughout the retrofit process. This is extremely valuable as plans inevitably change, surveys reveal surprises, supply chains shift, and on-site decisions are made under pressure. Small hiccups like these can build up to have potentially project-altering consequences, and being able to map and keep track of ongoing decisions is invaluable.
An appreciating asset
Digital twins extend this vision beyond completion, and continue to provide valuable oversight during occupation. True success doesn’t stop at handover, and digital twin systems provide long-term evidence of the efficiency of the project. Smart meters and environmental sensors mean that landlords can continuously measure the rewards of the project, and ensure success is backed up by high-quality, real time data.
This kind of post-occupancy insight helps close the long-standing gap between design and performance, and gives providers evidence to satisfy regulators, funders and boards that retrofit investment is delivering value.
For social housing providers, digital twins are less about transformation through technology and more about risk management at scale. Used well, they can support better investment decisions, reduce disruption for residents and improve accountability across teams and supply chains.
The benefit for residents extends beyond fewer disruptions and improved efficiency, it can also streamline resident communications. Clear visualisations and data can be used to explain why certain works are being carried out, and how homes are expected to perform after the retrofit is completed.
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Sum of its parts
As with much of the technology we see today, however, digital twins are reliant on quality source data to function to the best of their ability. Digital twins are by no means a shortcut- an accurate understanding of housing stock and the elements at play within it are instrumental. Poor asset data will limit their usefulness, and skills gaps could see them become underused or misunderstood.
Digital twins can bring strategy and scope to a retrofit project, but they are only a piece of the puzzle. Their strength lies in optimising the decision-making process- the success of a project is still reliant on the resources and expertise necessary to make the project a reality. As retrofit moves from pilot schemes to a core organisational function, tools that help landlords understand homes as complex, lived-in systems — rather than static assets — are likely to become increasingly important.
