Towards Consistent On-Site SRI Assessments

As buildings become smarter and more closely connected to the energy system, consistent assessment of their smart capabilities is increasingly important. A new CEN Technical Specification provides a standardized framework for on-site Smart Readiness Indicator (SRI) assessments, combining a common assessment process, harmonized assessor competences and a shared technical basis.

Why does Europe need a common framework for on-site SRI assessments?

Imagine two qualified SRI assessors evaluating the same building. Should they reach the same conclusions?

For building owners, investors and authorities, the answer is clearly yes. Yet consistent results are not automatic. Modern buildings combine heating, cooling, ventilation, lighting, renewable energy systems, electrical storage, electric vehicle charging and Building Automation and Control Systems (BACS). Assessing how these systems interact requires more than confirming that equipment is installed. It requires understanding how technical building systems operate, how automation supports them and how their functionality contributes to smart readiness.

The Smart Readiness Indicator (SRI) provides a European methodology for assessing the smart capabilities of buildings. While the existing methodology defines what should be assessed, practical experience has shown the need for a common approach to how on-site assessments are performed. Differences in procedures, interpretation and assessor expertise can all affect the outcome.

To address this need, CEN/TC 247 is developing a Technical Specification that sets out a common framework for on-site SRI assessments. Its provisions aim to improve the quality, consistency, transparency and comparability of assessments across Europe.

Isn't there already guidance for SRI assessments?

Yes. In 2025, the CEN-CENELEC Workshop Agreement (CWA 18193) introduced the first common guidance for on-site Smart Readiness Indicator (SRI) assessments. It defined a shared assessment workflow, described the knowledge expected of SRI assessors and established common terminology for smart readiness. The CWA has therefore supported the first practical SRI implementations across Europe.

However, a Workshop Agreement captures emerging knowledge and practical experience. As SRI moves from pilot projects to wider implementation, consistent and reproducible assessments become essential. An SRI assessment should not depend on the assessor or the Member State in which it is carried out. Consistency builds confidence among building owners, investors, authorities and training organisations, and ensures that results are comparable across Europe.

To support this next phase, CEN/TC 247 is developing a Technical Specification (TS). Its purpose is not to redefine the Smart Readiness Indicator, but to standardize how on-site SRI assessments are performed. Building on the experience gained with the CWA, the TS establishes a common European framework based on three complementary pillars:

·         a common assessment process;

·         harmonized assessor competences;

·         a shared technical foundation.

Together, these three pillars form the core of the Technical Specification and are discussed in the following sections.

How does the Technical Specification improve assessment consistency?

An SRI assessment is more than completing a checklist. Assessors must reach conclusions that are transparent, evidence-based and comparable, regardless of who performs the assessment. This requires not only technical expertise, but also a common assessment process.

Assessors collect building information, identify applicable technical building systems, determine which smart-ready services are present, evaluate their implemented functionality levels and document the evidence supporting their conclusions. A structured process ensures that every assessment follows the same logical sequence, regardless of building type or assessor.

The Technical Specification defines a common assessment process covering the full assessment lifecycle: defining the scope and objectives, collecting data, conducting the on-site inspection, analysing smart-ready services, reporting results and discussing possible improvement measures with the building owner or operator.

A key principle is that the assessment must be evidence-based. Existing documentation is a valuable starting point, but it cannot by itself prove that smart functions are implemented or operating as intended. During the site visit, the assessor verifies the installed technical building systems, implemented control strategies and available functionality, so the assessment reflects the actual building rather than only its design documentation.

Each step supports a consistent, transparent and evidence-based assessment whose conclusions can be understood, verified and compared. By following the same sequence, documenting assumptions and recording evidence consistently, assessments become clearer for building owners, authorities and other stakeholders. This increases confidence in individual results and supports harmonized SRI implementation across Europe.

What makes a competent SRI assessor?

Unlike many building assessments, an SRI assessment is not limited to individual technical systems. It evaluates how technical building systems interact through automation and control to improve energy performance, occupant comfort and interaction with the energy grid.

Building automation cannot be assessed separately from the technical processes it controls. Before evaluating an automation strategy, assessors must understand the underlying technical process it is intended to control.

For example, assessing a heat pump control strategy requires knowledge of the heating or cooling process. Similarly, evaluating demand-controlled ventilation requires an understanding of both the ventilation system and the control philosophy that regulates airflow based on occupancy or indoor air quality.

Modern Building Automation and Control Systems (BACS) increasingly integrate multiple technical disciplines. Heating, cooling, ventilation, lighting, renewable energy generation, electrical storage and electric vehicle charging are no longer isolated systems; they work together to optimise building performance. In Zero-Emission Buildings (ZEB), this integration is even more important as buildings coordinate local energy generation, storage and consumption. Demand-side management (DSM) and demand-side flexibility (DSF) add a further dimension by enabling buildings to respond intelligently to external signals from the electricity grid.

An SRI assessor therefore needs a broad interdisciplinary understanding of technical building systems, automation and operational processes. The aim is not for assessors to design or commission these systems, but to enable them to recognise implemented functionality correctly, evaluate its level of smartness and assess it consistently.

For this reason, the Technical Specification defines a harmonized competency framework covering both technical knowledge and practical assessment skills. By establishing a common competency profile, the TS helps ensure that SRI assessments are conducted with a comparable level of expertise across Europe.

Where does the technical foundation of SRI come from?

Competent assessors also need a common technical reference. For building automation and control functions, one of the main foundations is EN 15232, which later evolved into EN ISO 52120-1.

The Smart Readiness Indicator (SRI) was developed through technical support studies that translated the objectives of the Energy Performance of Buildings Directive (EPBD) into a practical assessment methodology. To assess building automation and control consistently, the developers used several existing technical references. A principal foundation was EN 15232, the European standard that classified building automation and control functions according to their contribution to building energy performance. Using this established engineering framework avoided the need to create a new classification of automation functions.

As EN 15232 evolved into EN ISO 52120-1, the technical basis for assessing building automation also evolved. The forthcoming Technical Specification continues this development. Rather than introducing new technical criteria, it provides a common reference for applying existing automation and control functions during on-site SRI assessments. In this way, it links the SRI methodology to an internationally recognised engineering standard and supports consistent interpretation and comparable assessment outcomes across Europe.

What does this Technical Specification mean for the future of SRI?

Buildings are becoming increasingly interconnected. Building automation no longer controls individual installations in isolation; it coordinates technical building systems to optimise energy performance, occupant comfort and interaction with the energy system. As buildings become smarter, assessing their smartness also becomes more demanding.

The forthcoming Technical Specification gives stakeholders involved in smart buildings a common European framework for on-site SRI assessments. It brings together a structured assessment process, a harmonized competency framework and a shared technical foundation in one methodology. This improves the quality, consistency, transparency and comparability of results, benefiting assessors, building owners, system integrators, training organisations, certification bodies and public authorities.

Beyond supporting current SRI assessments, the Technical Specification creates a foundation for future developments. The transition towards Zero-Emission Buildings, greater integration of renewable energy sources, energy storage, electric mobility and demand-side flexibility will further increase the importance of intelligent building automation. A common assessment framework enables these developments to be evaluated consistently and gives confidence that smart building capabilities are assessed using the same engineering principles across Europe.

Ultimately, the value of the Technical Specification lies not only in the methodology it defines, but also in the confidence it creates. When assessors follow a common process, apply the same technical reference and have comparable competences, SRI assessments become more transparent, comparable and meaningful for building owners, investors, policy makers and the wider smart building industry.