Key Takeaways
Ensuring legal compliance in buildings is no longer just about avoiding penalties — it's a strategic lever for long-term performance, transparency and operational excellence. From certified metering to automation and reporting, each regulation brings both obligations and opportunities to build a future-ready energy infrastructure.
- Traceable, certified energy data is essential to comply with EPBD, MID and national schemes like Eco Énergie Tertiaire.
- Automation systems (BACS) help transform regulatory goals into actionable, energy-saving operations.
- Non-compliance can lead to financial, contractual and reputational risks — but also missed performance gains.
In 2023, buildings and construction accounted for 32% of global final energy demand and 34% of energy-related CO₂ emissions, according to the 2024/2025 Global Status Report for Buildings and Construction (UNEP / GlobalABC). Emissions from the sector are still increasing, whereas they should already have fallen by almost 30% by 2030 in order to stay on the Paris Agreement-aligned trajectory, according to the same source.
This gap explains why public authorities are tightening building energy codes, performance standards and measurement obligations.
For building owners and operators, legal compliance is no longer just a local incentive: it is part of a broader international effort to make all new buildings zero-emission by 2030 and all buildings zero-emission by 2050.
Energy performance and legal compliance: whose concern are they?
Facility Managers and Energy Managers
Owners, operators and Facility Managers use compliance-ready metering and monitoring to protect both budgets and assets:
- OPEX control
Addressing the current reality of commercial pressure on buildings in terms of cost allocation, tariff optimisation and the reduction of energy consumption is more important than ever.
- Validate your energy strategy with reliable, traceable data
Robust, traceable data forms the backbone of sustainable energy management strategies, enabling stakeholders to confidently navigate audits, support ESG commitments and optimise resource use.
- Comply with EU regulations, IT and cybersecurity requirements
An increasingly strict regulatory framework – at both European and national levels – is exerting growing pressure on buildings to monitor and optimise their energy use, while ensuring transparency for investors and occupants. Energy performance must be demonstrated.
Energy service companies (ESCOs)
Energy efficiency and legal compliance within buildings are key elements of ESCOs’ value propositions:
- Performance guarantees
Measurement systems provide the verified, time-stamped data required to validate savings and respect contractual targets.
- Rely on accurate and auditable energy data
ESCOs must provide reliable baselines for optimisation, which requires accurate and actionable data.
- Managing data complexity under growing regulatory pressure
Communication and absolute interoperability with different systems according to EN ISO 52120 is one perennial challenge for projects.
A regulatory environment driven by transparency
Building owners and operators need to comply with energy performance regulations
In Europe and across many other regions, regulations now require measurable proof of performance:
Mandatory efficiency trajectories
Directives and standards such as the Energy Efficiency Directive (EED), the Energy Performance of Buildings Directive (EPBD), the Alternative Fuels Infrastructure Regulation (AFIR) and the Measuring Instruments Directive (MID) define obligations for performance, monitoring and measurement.
Reporting on progress and actions
Buildings must demonstrate not only their current performance level, but must also demonstrate progress over time, backed by measured data.
Requirement for measured evidence, not estimates
Simplified estimates are no longer sufficient. Authorities, auditors and investors expect decisions and declarations to be based on actual measurements and auditable data trails.
BACS logic for smart buildings and automation
Building energy codes and BACS
Within the EU, Building Energy Codes such as the EPBD (Energy Performance of Buildings Directive) now require large non-residential buildings to integrate BACS (Building Automation and Control Systems).
This isn’t just about ticking boxes. It’s about using smart control to cut energy waste, improve performance and stay compliant - automatically.
What’s changing?
By 2025, all buildings with >290 kW HVAC capacity must be equipped with automation systems that can:
- Monitor energy use in real time
- Identify faults or inefficiencies
- Automatically adjust settings to optimise performance
No more manual fine-tuning - compliance becomes continuous.
Socomec's expert advice
"This regulation has two components: energy measurement and metering, and control and regulation based on continuous measurements. To achieve this, the different functional areas must be defined and their consumption measured. The BACS regulation therefore requires the implementation of a control system as well as measurement and metering equipment,"
Olivier Goujon, Area Business Developer – Energy Efficiency Solutions at Socomec.
A deployment gap between regulation and reality
Although BACS are mandatory above certain power thresholds, market observations show that the current pace of deployment will only equip a small share of the tertiary stock by the regulatory deadlines if nothing changes. Furthermore, where BACS are installed, many are not fully operational: initial commissioning is often incomplete, and re-commissioning to reflect changes in use or equipment remains the exception.
Without a clear organisational model and dedicated resources, the systems do not deliver their full energy performance potential.
MID compliance – a key enabler for accurate energy performance
Building energy performance and accuracy
Getting on track for 2030 requires energy-related emissions from buildings to fall by about 0.77 Gt CO₂ every year - roughly 11% per year - and energy use intensity to decrease by 5.1 kWh/m² annually. Achieving this level of reliable energy performance starts with trusted measurements. The Measuring Instruments Directive (MID – 2014/32/EU) defines the legal framework for all meters used in billing or cost allocation across the EU.
For building operators, using MID-compliant meters is not only a regulatory requirement - it’s a guarantee of accuracy, transparency and consistency in energy data.
*Global Status Report
A regulatory must for energy cost allocation
The use of MID-certified meters is mandatory wherever electricity is measured and re-invoiced.
For example:
- Tenants in multi-occupancy buildings
- Business units in industrial facilities
- Charging points for electric vehicles (EVs)
Consumption allocation across zones, tenants and processes
Detailed sub-metering supports fair chargeback models and allows each stakeholder to see the impact of their own actions on energy performance.
Fairness and transparency for financial chargeback
Transparent metering and clear allocation rules reduce disputes between landlords and tenants or between internal cost centres.
Socomec’s expert advice
“When installing measuring equipment, it must be sufficiently accurate and reliable, with repeatable measurements. The instrumentation must be of good quality because what is measured will guide companies' choices and investments. If the data is not sufficiently accurate and reliable over time, this can lead to incorrect diagnoses and investments in unsuitable solutions" advises Olivier Goujon.
Legal compliance – from regulation to action
European energy regulations are evolving fast
Whether through the deployment of BACS systems, the enforcement of MID-compliant meters, or the implementation of EN 17267 monitoring plans, one principle remains constant: energy performance begins with reliable measurement.
At Socomec, we support building owners and energy managers in navigating this complexity. Drawing on extensive field experience - from industrial sites to large tertiary buildings - our teams observe a common challenge: how to make compliance a driver for long-term performance.
Field observations:
- Measurement is often fragmented or inconsistent, making it difficult to link actions with results.
- Non-certified meters weaken the credibility of cost allocation and ESG reporting.
- Metering systems rarely meet EN 17267 requirements, especially in terms of traceability and long-term accuracy.
- BACS are underused, even though they offer proven savings when correctly deployed and monitored.
“Reliable energy measurement and monitoring is the foundation of energy sobriety and regulatory compliance.” Olivier Goujon
When systems are well specified, correctly installed and based on traceable data, the results are clear:
- up to 14% energy savings in real buildings
- a potential 10–15 TWh/year in national savings, as shown in recent industry studies.
From obligation to opportunity
When approached strategically, regulatory compliance becomes a driver of operational excellence. It enables the deployment of EN 17267–compliant metering architectures, where KPIs are clearly tied to reliable and well-documented measurement points. Using MID-certified meters secures billing, cost allocation and ESG reporting in line with the Measuring Instruments Directive (2014/32/EU). It also provides a robust basis for monitoring and verifying energy savings, particularly for ISO 50001 or performance-based schemes. When combined with BACS and accurate sub-metering, this framework unlocks demand-side flexibility, with national studies such as GIMELEC pointing to potential savings of 10–15 TWh per year.
Use our infographic to quickly see which EU regulations apply to your buildings, the key actions you must take, and the main risks and penalties if compliance is not met.
FAQ
What does legal compliance for buildings mean in terms of energy performance?
Legal compliance for buildings covers all obligations linked to energy performance, measurement and monitoring throughout the life of a building. It includes European regulations such as EPBD and EED, national requirements like the BACS decree in France, and rules on sub-metering and the use of MID-compliant meters when energy data is used for billing or cost allocation.
How do energy measurement and sub-metering support legal compliance in buildings?
Energy measurement and sub-metering provide the detailed consumption data required for regulatory reporting, audits and performance verification. Main meters capture total building consumption, while sub-meters monitor specific areas or uses such as HVAC, lighting, data rooms, EV charging or individual tenants.
When do I need MID-compliant meters for sub-metering and tenant billing?
MID-compliant meters are required whenever sub-metered energy data is used for financial purposes. This includes tenant billing, invoicing for EV charging and any regulated energy cost allocation based on measured consumption.
How do EU directives such as EPBD, EED and AFIR impact your energy performance strategy?
EU directives such as EPBD, EED and AFIR make energy performance a strategic and regulated requirement for buildings. They impose continuous efficiency improvements, mandatory automation and accurate metering, with local implementation deadlines. Buildings must demonstrate performance to regulators, investors and occupants to protect asset value and avoid penalties.
How can building owners, Facility Managers and ESCOs prepare for future regulations and audits?
Preparing for future regulations requires treating legal compliance as a continuous process. This includes designing a metering and sub-metering plan aligned with regulations and internal KPIs, selecting MID-compliant meters with scalable architectures, and enabling renewables, EV charging and energy flexibility to increase on-site energy self-consumption.