Ireland’s building automation requirements for non-residential buildings

Ireland has a current building automation and control requirement for part of the existing non-residential building stock. The duty comes from S.I. No. 393 of 2021, as amended by S.I. No. 642 of 2024.

The 2024 amendment changed the programme from a broad product requirement into a clearer operational test. It also moved the completion date, so an older specification can now be wrong about both the functions and the timetable.

The current Irish duty should be assessed separately from the later 70 kW and lighting-control stages in the recast Energy Performance of Buildings Directive (EPBD). The directive sets the destination for Member States. Irish regulations and technical guidance set the enforceable detail for a project in Ireland.

Current Irish scope and deadline

Regulation 5(c) of S.I. No. 393 of 2021 applies to an existing building other than a dwelling where either of these conditions is met:

• the effective rated output of the heating system, or combined space-heating and ventilation system, is over 290 kW; or
• the effective rated output of the air-conditioning system, or combined air-conditioning and ventilation system, is over 290 kW.

The installation must be technically and economically feasible. S.I. No. 642 of 2024 changed the completion date to before 31 December 2024. The practical position on 6 October 2026 is therefore:

The regulation says “over 290 kW”. A system rated exactly 290 kW does not exceed that threshold. Record the nameplate ratings, the equipment included in each system and the method used to determine effective rated output. Do not substitute the building’s electrical connection rating, annual energy use or floor area.

The statutory instrument does not define its own test for technical and economic feasibility. The current SEAI BACS page says that an exception should be supported by an assessment from an independent competent professional. The official technical guidance describes a lifetime cost-benefit assessment or, alternatively, a simple-payback assessment using the previous three years of energy bills and the expected savings from the BACS in operation. It treats a maximum payback of 10 years for a public building and three years for another building as typically economically feasible.

These figures are guidance for the assessment, not extra thresholds written into Regulation 5(c). The building owner should retain the capacity survey, engineering constraints, costs, expected savings, alternatives, calculation and signed conclusion. A general assertion that a retrofit was too expensive does not show how the statutory condition was assessed.

What the system must do

Regulation 5A, inserted by S.I. No. 642 of 2024, defines a building automation and control system for this duty. It must be capable of:

1. continuously monitoring, logging and analysing energy use, and allowing energy use to be adjusted;
2. benchmarking the building’s energy efficiency, detecting losses in the efficiency of technical building systems, and informing the person responsible for the facilities or technical building management about improvement opportunities;
3. communicating with connected technical building systems and other appliances inside the building, with interoperability across different proprietary technologies, devices and manufacturers; and
4. from 29 May 2026, monitoring indoor environmental quality.

These are functions of the complete installed system. A meter can provide a reliable energy value, but it does not benchmark a building, diagnose an efficiency loss or adjust plant by itself. A dashboard can show trends without communicating with the technical systems that need to act. A protocol label does not prove that values, timestamps, units, quality states and commands are usable across the installation.

Monitoring alone does not satisfy the requirement. A project record should show which components deliver each function, how information moves between them and who responds when the system identifies an issue.

Indoor environmental quality now forms part of the duty

The Irish definition requires monitoring of indoor environmental quality from 29 May 2026. The regulation does not prescribe one universal sensor list or sampling interval. Select parameters and locations from the occupied spaces, their use and the systems being controlled.

A useful record may include representative temperature, relative humidity, carbon dioxide and other relevant air-quality parameters. Link each point to a zone, occupancy pattern and ventilation or conditioning system. A single temperature sensor in a plant room cannot establish the conditions experienced across offices, classrooms, retail areas or other occupied zones.

Define the acceptable range, sample interval, retention period, alarm threshold and response owner for each point. Record missing or stale data as a quality state. Replacing a missing value with zero can hide a sensor or communications failure and create a false performance result.

Enforcement and project evidence

S.I. No. 393 of 2021 makes contravention by act or omission an offence. Its penalty provision applies sections 17 to 17C of the Building Control Act 1990 to the regulations. Compliance responsibility cannot be reduced to owning a particular product or receiving a monthly report.

Build an evidence pack around the statutory functions:

SEAI's compliance-assessment flow distinguishes two records. Where a BACS is installed, retain evidence that its required functions operate. Where an independent assessment concludes that installation is not technically or economically feasible, retain that assessment. The factsheet identifies both records as material for review by Building Control. A purchase order, product datasheet or screenshot of a dashboard does not demonstrate the complete functions in operation.

Commission the system with known conditions. Compare meter totals with an independent reference, change a schedule through the approved interface, create a defined alarm, interrupt a communications path and confirm recovery. Test that a second system can obtain the required values with their timestamps, units and quality states.

Start read-only when connecting existing plant. Enable a write only when the equipment manufacturer documents the writable object or register, the building operator approves the control boundary, command priority is defined and a failed command has a safe outcome. Keep local safety and equipment protection in the plant controller.

How the recast EPBD changes the next stage

Directive (EU) 2024/1275 recasts the EPBD. Article 13 requires Member States to ensure that, where technically and economically feasible, building automation and control covers:

• non-residential buildings with the stated heating or cooling systems over 290 kW by 31 December 2024; and
• non-residential buildings with those systems over 70 kW by 31 December 2029.

Article 13 also requires suitably zoned automatic lighting controls that can detect occupancy:

• above 290 kW by 31 December 2027; and
• above 70 kW by 31 December 2029.

S.I. No. 642 of 2024 expressly gave full effect to Article 13(9)(a), the 290 kW stage, and Article 13(10), the BACS functions. It did not rewrite Regulation 5(c) to 70 kW or establish the Article 13(12) lighting stages.

This distinction matters. The directive sets dates and outcomes that Ireland must implement. It does not supply every national process, evidence rule or enforcement detail needed for an Irish building project. The current Irish threshold in Regulation 5(c) remains over 290 kW in the legislation cited here. Follow later Irish statutory instruments and technical guidance before treating the 70 kW or lighting stages as a complete national specification.

The recast EPBD also adds requirements beyond the existing non-residential BACS duty. They include control functions for certain new residential buildings and residential buildings undergoing major renovation, subject to the directive’s feasibility and exclusion provisions. Those provisions should not be used to reinterpret Regulation 5(c), which addresses existing buildings other than dwellings.

Prepare a building for the 70 kW stage

A building between 70 kW and 290 kW can prepare without representing future Irish details as settled.

1. Confirm the system boundary. List heating, combined heating and ventilation, air-conditioning, and combined air-conditioning and ventilation plant with effective rated outputs.
2. Map the energy balance. Reconcile the building supply with major plant and identify material unmetered loads.
3. Inventory existing interfaces. Record BACnet, Modbus, M-Bus, pulse, analogue and other documented interfaces, including versions, permissions and network ownership.
4. Define occupied zones. Map indoor environmental monitoring and future lighting-control zones to actual use and occupancy.
5. Assign the required functions. Show where monitoring, analysis, adjustment, benchmarking, loss detection, operator information and interoperability will occur.
6. Retain procurement flexibility. Require exportable data with units, timestamps and quality, and avoid making the evidence dependent on one proprietary dashboard.
7. Track Irish implementation. Update the design when national regulations and guidance define the 70 kW and automatic-lighting stages.

Do not postpone basic energy and condition records while waiting for the final national detail. A well-defined read-only measurement layer can establish the baseline, reveal missing points and reduce commissioning risk. Keep the distinction between preparation and demonstrated statutory compliance in the project record.

Where EpiSensor fits

EpiSensor can provide measurements and interfaces around existing building plant. Electricity monitors can separate heating, cooling, ventilation, pump and lighting feeders. Pulse and M-Bus interfaces can collect gas, water and heat-meter totals. Modbus and analogue interfaces can collect controller states and process measurements. Edge can keep the operational record on site and serve collected data onward over Modbus TCP, MQTT or HTTP.

That can close measurement gaps, connect older equipment and provide independent operational evidence to a wider BMS. It does not make a building compliant by itself. The complete installation must provide every applicable Regulation 5A function, establish the required plant and occupied-zone coverage, and retain evidence that the functions work together.

Use the HVAC energy-monitoring application to define plant boundaries and the BMS and SCADA meter-integration application to plan the data path from existing equipment.