The importance of BACS systems according to the UNI EN ISO 52120 standard
Building automation is now one of the cornerstones of modern construction. Systems capable of self-regulating based on environmental parameters or predefined needs are no longer simply an added value, but an essential component for ensuring energy efficiency, sustainability, and living comfort.
In this context, the UNI EN ISO 52120-1:2022 standard defines a clear framework for assessing and classifying the impact of automation and control systems on buildings, replacing the previous UNI EN 15232.
What does the UNI EN ISO 52120 standard establish?
The standard, entitled “Energy performance of buildings – Contribution of building automation, control and management – Part 1: General framework and procedures,” updates and expands on the content introduced over a decade ago by EN 15232.
Its objective is to provide tools for objectively assessing how automation systems – so-called Building Automation & Control Systems (BACS) – contribute to improving overall energy performance.
The update responds to the growing need for more efficient buildings, in line with the European Energy Performance Directives (EPBD), and introduces methodologies for classifying control, automation, and management functions based on the achievable results.
BACS System Classification
UNI EN ISO 52120 defines a classification scale that identifies the level of automation and control of a building, from class D (minimum level) to class A (maximum efficiency).
• Class D: systems with no or limited automation.
• Class C: standard level of automation and control.
• Class B: advanced systems with integrated and optimized functions.
• Class A: high-performance solutions with continuous monitoring, intelligent control, and interaction between multiple services.
The assessment covers both residential and non-residential buildings and considers functions such as air conditioning, ventilation, lighting, domestic hot water production, and solar shading management.
An Evolving Regulatory Framework
The importance of this classification is reinforced by EU Directive 2024/1275, which mandates the integration of BACS systems even in residential settings, favoring advanced solutions.
For non-residential buildings, the Minimum Requirements Decree (updated October 28, 2025) mandates the adoption of Class B systems for new construction or renovations, in line with the Minimum Environmental Criteria (CAM Edilizia).
Why UNI EN ISO 52120 is essential
UNI EN ISO 52120 is a valuable technical and operational tool for designers, installers, and energy assessors.
It allows you to:
• objectively measure the effectiveness of automation systems;
• estimate the energy savings achievable with more advanced solutions;
• facilitate access to incentives and tax deductions linked to the quality of the intervention;
• promote smarter, more sustainable, and more interconnected buildings.
Towards increasingly smart buildings
Automation and integrated control of systems are no longer an option, but a necessity for those who design and build forward-looking buildings.
The UNI EN ISO 52120 standard provides the common language and technical criteria to guide this evolution, contributing to the dissemination of BACS solutions capable of improving comfort, safety, and sustainability.
Allmatic, always focused on innovation and efficiency, closely follows regulatory and technological developments in the sector, continuing to develop solutions that integrate automation, control, and energy savings.