For years, "smart building" was a marketing phrase. As of 2026, it is a legal obligation. The recast Energy Performance of Buildings Directive — Directive (EU) 2024/1275 entered into force on 28 May 2024 and must be written into the national law of every EU member state by 29 May 2026. For owners and operators of commercial property, that deadline turns building automation from a nice-to-have into a compliance requirement — and for the system integrators who serve them, into one of the largest retrofit opportunities of the decade.
This guide breaks down what the EPBD recast actually requires, who the Building Automation and Control Systems (BACS) mandate applies to, and why LoRaWAN® sensing has become the most practical way to bring an existing building into compliance without tearing open the walls.
What the EPBD Recast Actually Requires
The EPBD is the EU's central instrument for decarbonising buildings, which account for roughly 40% of the bloc's energy consumption. The 2024 recast is the most ambitious version yet. It is a directive, not a regulation, which means it does not apply directly — each member state must transpose it into national legislation by 29 May 2026. That single date is why the EPBD is "now law": from that point, the obligations below stop being Brussels policy and start being enforceable national rules with national penalties.
Four pillars matter most for commercial buildings: mandatory building automation (BACS), continuous indoor environmental quality monitoring, minimum energy performance standards (MEPS) that trigger renovation of the worst-performing stock, and the move to zero-emission buildings for new construction.
The BACS Mandate, Explained
The headline obligation for existing commercial buildings sits in Article 13. Non-residential buildings with a heating, ventilation or air-conditioning system (or combined heating/ventilation) above a defined power threshold must be fitted with a Building Automation and Control System, where it is technically and economically feasible.
Who it applies to — and when
The thresholds phase in over time, capturing progressively smaller buildings:
| Building type | HVAC threshold | BACS required by |
|---|---|---|
| Large non-residential | Effective rated output > 290 kW | Already in force (enforced via national transposition) |
| Mid-size non-residential | Effective rated output > 70 kW | By the end of 2029 (commonly cited as "by 2030") |
In practice, the > 70 kW step is the one to plan for. It pulls the majority of offices, schools, hotels, retail units, healthcare facilities and warehouses into scope well before the decade is out.
What a compliant BACS must actually do
Article 13 is functional, not prescriptive about technology. A compliant system must be capable of:
- Continuously monitoring, logging and analysing energy use, and allowing it to be adjusted.
- Benchmarking the building's energy efficiency and detecting efficiency losses.
- Detecting faults in technical building systems and informing the operator or facility manager.
- Communicating with connected technical building systems and other devices, and being interoperable across vendors.
Crucially, nothing in the directive requires this data to travel over copper cabling. What matters is the capability — continuous sensing, logging, analysis and alerting. That is precisely where a wireless sensor layer earns its place.
Why LoRaWAN Is the Practical Compliance Path
The buildings the EPBD targets already exist. Most were never wired for granular monitoring, and the MEPS provisions specifically push owners to renovate the worst-performing stock — buildings where running structured cabling to every meter, valve and room is slow, disruptive and expensive. LoRaWAN was designed for exactly this gap.
A single LoRaWAN gateway typically backhauls hundreds of devices, turning a disconnected building into a continuously monitored one over a weekend rather than a quarter. For a deeper look at network design, frequencies and scaling across the EU, see our Ultimate Guide to LoRaWAN Deployment in Europe.
Mapping EPBD Requirements to Sensors
Each functional requirement in the directive maps cleanly onto a category of LoRaWAN device. This is the practical shopping list for a BACS-ready building:
| EPBD requirement | What to sense | Device category |
|---|---|---|
| Continuous energy monitoring & sub-metering | Electricity use per circuit, load or tenant | LoRaWAN energy meters & current transformers |
| Indoor environmental quality (IEQ) | CO2, temperature, humidity, TVOC, PM2.5/PM10 | Indoor air-quality sensors |
| Demand-based HVAC & ventilation control | Occupancy, headcount, presence, temperature | Occupancy / people-counting sensors & smart thermostats |
| Fault & efficiency-loss detection | Flow/return temperatures, runtime, pressure, pulse counts | Temperature, pressure & pulse-counter sensors |
| Data logging, interoperability & alerts | Aggregation, backhaul, integration to BMS/cloud | LoRaWAN gateways & network server |
How It Fits Together: A Three-Layer Architecture
A BACS-ready LoRaWAN deployment follows the same three layers as any well-designed IoT system:
1. Sensing layer
Battery-powered sensors and meters distributed across rooms, plant and distribution boards, each reporting on a schedule or when a threshold is crossed.
2. Connectivity layer
One or more LoRaWAN gateways receive every uplink and forward it to a network server. In most buildings a single indoor gateway is enough; larger or multi-storey sites add a second for resilience.
3. Application layer
Data lands in a dashboard, BMS or analytics platform where it is logged, benchmarked and turned into alerts and control actions — the functions Article 13 requires. We cover reference designs in detail in our Solutions & Architecture hub.
From sensor to compliance, in three layers
How a wireless LoRaWAN deployment delivers everything a compliant BACS must do — without tearing open the walls.
CTs & sub-meters
humidity · PM
people count
pressure · pulse
Beyond BACS: The Wider 2026 Picture
BACS is the obligation with the nearest deadline, but it sits inside a much larger compliance landscape that the same sensing layer helps you address:
- Minimum Energy Performance Standards (MEPS). Member states must renovate the worst-performing 16% of non-residential buildings by 2030 and 26% by 2033. Continuous monitoring data is what proves a building has moved out of the worst-performing band.
- Indoor environmental quality. The recast adds provisions to monitor and improve IEQ. CO2-based occupancy estimation enables proportional ventilation — cutting energy while keeping air healthy.
- Zero-emission buildings (ZEB). All new public buildings must be zero-emission from 2028, and all new buildings from 2030 — designs that assume dense, low-power sensing from day one.
- Smart Readiness Indicator (SRI). Currently optional, but the Commission is due to report on it by mid-2026, with a possible delegated act extending it to large HVAC buildings. A connected building scores far higher on the SRI.
A Practical Compliance Checklist
- Confirm your national deadline. Check how your country has transposed Article 13 and which thresholds and exemptions apply.
- Establish HVAC rated output. Determine whether each building sits above the 290 kW or 70 kW threshold.
- Baseline your data gaps. List what you already meter versus what Article 13 requires you to monitor continuously.
- Specify the sensing layer. Use the requirement-to-device table above to build the bill of materials.
- Plan coverage. Size gateways and run a quick site survey before rollout.
- Integrate and document. Feed data into a BMS/dashboard and keep the logs that demonstrate compliance.
Frequently Asked Questions
The questions we hear most from facility managers, building owners and integrators preparing for the EPBD recast.
When does the EPBD recast actually become law in my country?
Directive (EU) 2024/1275 entered into force on 28 May 2024 and must be transposed into national law by 29 May 2026. The precise rules, thresholds and penalties you must follow are the ones adopted in your member state's transposing legislation, so check the national text.
Does the BACS mandate apply to my building?
It applies to non-residential buildings whose heating, ventilation or air-conditioning systems exceed the power thresholds set in Article 13 — above 290 kW already, dropping to above 70 kW by the end of the decade. Residential buildings are out of scope for the BACS requirement, though other parts of the directive still apply.
Can I meet the requirements with wireless sensors, or do I need wired BACS?
The directive defines BACS by function, not by cabling. As long as the system can continuously monitor, log, analyse, benchmark and flag faults, and is interoperable, a wireless LoRaWAN sensing layer feeding a control/analytics platform is a valid approach — and usually far less disruptive to retrofit than wired alternatives.
Is indoor air quality monitoring mandatory under the recast?
The recast strengthens indoor environmental quality provisions and many member states require IEQ monitoring in new and renovated non-residential buildings. CO2, temperature and humidity sensing is the practical baseline, and it doubles as the input for demand-controlled ventilation that lowers energy use.
How disruptive is a LoRaWAN retrofit?
Minimal. Sensors are battery-powered and mount with brackets or adhesive, so there is no structured cabling and little downtime. A typical building needs only one or two gateways, and most sites can be instrumented in days rather than weeks.
From Deadline to Opportunity
The EPBD recast reframes building monitoring from optional to obligatory — but the same data that proves compliance also cuts energy bills, extends equipment life and makes spaces healthier to occupy. The owners who treat 2026 as a deadline will scramble; the ones who treat it as a prompt to instrument their buildings will come out ahead on both compliance and operating cost. A LoRaWAN sensing layer is the fastest, least invasive way to get there.
This article is general guidance, not legal advice. Compliance obligations are defined by your member state's transposition of Directive (EU) 2024/1275 — confirm the specifics for your jurisdiction before acting.
Preparing a Building for EPBD Compliance?
Our engineering team helps owners and integrators across Europe specify, source and deploy BACS-ready LoRaWAN sensing — pre-configured and ready to ship.