SRI – Smart, Simple, and Fair
When the European Commission refers to smart buildings, it mainly means ordinary buildings that run heating, cooling, ventilation and lighting more intelligently. The In practice, the SRI rates how well a building’s technical systems can sense, control, inform, and respond—to reduce energy waste while safeguarding comfort. It sits alongside the Energy Performance Certificate (EPC) and draws its mandate from the revised Energy Performance of Buildings Directive (EU 2024/1275). It is aligned with the revised rules on building performance, which also strengthen attention to technical building systems including building automation and control alongside indoor environmental quality.
Across the EU, about 85 percent of buildings were built before 2000 and roughly 75 percent still have low energy performance. Most of these buildings will still be in use in 2050, which is why practical improvements to existing buildings matter more than futuristic new builds.
As with harmonised EPCs, using a common method supports comparability of capabilities and outcomes, independent of specific products. Comparable data can show where simple digital controls would bring the biggest comfort and cost gains, including in social housing, rather than assuming every upgrade needs to be high-tech or expensive, facilitating large-scale adoption of smart building technologies.
How does SRI data help cities decide which older buildings to upgrade first without expensive automation?
In OpenBEP4EU, QUE develops the open-source calculation engine that translates EPB standards and SRI-related information into consistent, transparent results. Our role is to make these assessments technically usable and comparable, so that cities and housing operators can base decisions on evidence rather than assumptions.
Seen through this lens, SRI data is most valuable as a diagnostic tool. A low score does not point to failure, but to opportunity: it shows where basic, proven controls are missing and where simple upgrades can quickly improve comfort, stability, and energy use.
When SRI data is combined with energy performance calculations in open-source software, it helps public authorities focus their efforts on older and social housing buildings where simple measures can make the biggest difference for residents.
Why This Matter in Older
and Social Housing
Most Europeans live in existing buildings, not new ones, and a significant share live in publicly supported or cooperative housing. This makes social housing a natural test bed for practical energy and digital upgrades. These buildings are managed collectively, cover many ages and types, and house people most affected by energy costs. In these settings, solutions that are easy for caretakers and facility teams to operate and maintain tend to deliver the most durable gains. If smart-readiness measures work here, they can work anywhere.
Social-rental housing makes up roughly 8 percent of Europe’s dwelling stock, though shares vary by country. Denmark’s non-profit sector houses about one in five households, among the highest in the Union, while Spain’s social housing remains below 3 percent, and Greece and Poland run only small municipal schemes. These contrasts show why a common assessment such as the SRI matters: it lets Member States with different housing structures see where digital upgrades would deliver the greatest social and environmental benefit.
In each case, the SRI’s value is diagnostic, not judgmental. A low score doesn’t label a building as bad, instead it points to where small affordable improvements could make the biggest difference.
Consider a 100-year-old apartment connected to district heating, with manual radiator valves and simple windows. Its SRI would record low smart readiness, yet a few targeted additions could improve comfort and stability: thermostatic valves to maintain steady temperatures, a heat or sub-meter to help balance flow, and small sensors to prevent dampness. Such steps work locally, need no constant internet link, and leave residents in control of their space. They show that smart readiness is less about technology and more about fairness, helping people in older buildings gain the same comfort and efficiency that new construction offers.
How can simple smart controls improve comfort and fairness in social/common/non-profit housing?
From Euphyia’s point of view, the biggest gains in comfort and fairness come from simple, proven controls applied where they matter most, not from complex automation. In social and non-profit housing, residents often have little influence over building systems, yet they are the most exposed to poor indoor comfort and high energy bills. Smart Readiness Indicator (SRI) data helps make these imbalances visible and actionable.
In many cases this requires starting with inexpensive solutions that stabilise daily living circumstances. Without altering people’s lifestyles, persistent overheating, cold spots, and stale air can be eliminated with thermostatic radiator valves, simple hydraulic balancing, and timed or demand-based ventilation. These steps are particularly effective in older blocks where energy is constantly wasted, and systems are still operated manually.
Targeting, not uniformity, is the source of fairness. Low SRI scores can support small improvements that swiftly increase comfort throughout entire blocks in Denmark, where non-profit housing is common. In Spain, where there is a shortage of public housing, SRI data can assist towns in prioritising straightforward controls over expensive display systems in aging apartment complexes. Due to Poland’s limited financial resources, SRI can direct investments toward sub-metering and fundamental controls that manage peak demand before more extensive improvements are even taken into consideration. The indicator might highlight Greece’s pressing need for indoor air quality monitoring and shading in order to alleviate heat stress in public buildings. Similarly, in Cyprus, where energy poverty and the risk of overheating frequently coexist, SRI can enable the targeted implementation of shade, ventilation control, and basic cooling management to reduce severe summer temperatures in social and municipal housing.
How the SRI Is Measured?
The EU provides a common methodology, while Member States decide how to apply it nationally. The SRI focuses on three key capabilities: improving energy performance in use, adapting operation to occupants’ needs, and responding to external signals such as grid demand or variable tariffs.
To assess these capabilities, the methodology looks at how a building supports a set of desired impacts. These include comfort, health and well-being, ease of operation and maintenance, access to information for occupants, and the ability to use energy more flexibly. Together, these impacts explain what “smart readiness” actually evaluates in everyday terms.
- Energy assessors examine nine technical areas of a building, such as heating, cooling, ventilation, lighting, electricity, and monitoring and control.
- Within each area, assessors look at specific services — for example, how heating is controlled, whether systems can detect faults, or whether operation adapts to use.
- Each service is assessed on a functionality scale from 0 to 4, ranging from no smart functionality to advanced, automated operation.
- Services are weighted according to their relevance and combined into an overall score.
- The result is expressed as a percentage score and class band, ranging from below 20% up to 90–100%.
- The assessment is descriptive rather than predictive: it records what is installed and operational at the time of inspection. Actual performance also depends on correct setup, commissioning, and ongoing adjustment.
Concrete Examples
- Lower SRI (around 20–35%): systems rely mainly on manual control, with limited automation, no system-level monitoring, and no diagnostic or feedback functions.
- Medium SRI (around 50–65%): systems include basic automatic control, time scheduling, room-level sensing, and simple fault or performance notifications.
- Higher SRI (around 80–90%): systems adapt operation to occupancy or external signals, integrate multiple building services, support diagnostics, and allow secure interaction with wider energy systems.
How City Teams and Investors
Can Use Low SRI Scores
SRI data can act as a planning tool. A cluster of schools lacking ventilation, apartment buildings with uneven heating, and public buildings with low lighting control, all scoring low on the SRI, can be first in line for simple indoor environment quality sensors, time-controlled ventilation, thermostatic valves, or flow balancing by scheduling timers or occupancy sensors. The aim is practical: start where simple controls fix daily problems for many people.
Some refurbishment and energy-service contracts increasingly value buildings that can monitor and verify performance and interact with flexible energy systems. An SRI that documents monitoring, safety updates, and demand-response readiness can reduce uncertainty for those contracts as Europe adds more variable renewables and needs greater demand flexibility.
What About Security and Privacy?
People reasonably ask how connected devices affect privacy and resilience. More connectivity can increase exposure to cyber-attacks, and outages should not disable core functions. EU guidance therefore emphasises secure-by-design approaches, including secure development practices, controlled updates, and proportionate data use for connected products. Good practice also includes segmented networks and role-based access, so that only the necessary data and functions are exposed.
In buildings, many controls operate on local networks; when external links are used, traffic passes through a gateway — a secured bridge that applies encryption and access rules between the local system and the outside world. If external connections fail, core functions should remain safe and operational without reliance on cloud services.
The guiding principle is proportionality. Digital functions should be added where they support comfort, reliability, and cost control, without making buildings dependent on constant connectivity. Digital control cannot compensate for a poorly performing building envelope: insulation and windows still matter first. The SRI does not dictate renovation order; it provides information that helps combine physical improvements with selective controls for the best cost-to-benefit.
From an implementation perspective, what makes the Smart Readiness Indicator useful for building owners and public authorities?
Used well, the SRI works less like a label and more like a practical roadmap. It translates ‘smart building’ into specific, assessable services – how systems monitor, control and communicate – while reflecting outcomes that matter day to day, such as energy efficiency, comfort, maintenance and flexibility. That helps owners and cities identify the most relevant upgrades for each building, and it encourages solutions that are robust in operation and easier to verify over time.
In Summary
In practice, buildings that score low often have the most room for useful gains. A low SRI means limited installed capability, not low potential or intrinsic quality of the building. Many older buildings are straightforward to upgrade with selective controls that stabilise room temperatures, reduce waste, and help occupants without changing daily habits.
Using a common assessment method for smart readiness is not about gadgets. It is about small, careful changes that make older buildings easier to live in and cheaper to run. When measured in the same way across Member States, the data can help direct support to the places where simple measures will help most, including in social hous-ing, and help avoid unnecessary demolition.