Commercial Fire Sprinkler Installation in Ireland

TL;DR

Commercial fire sprinkler work in Ireland changed considerably on 1 May 2025, when the 2024 edition of Technical Guidance Document B (TGD-B) for Fire Safety, Volume 1 (Buildings other than Dwelling Houses) came into operation. The revised Part B was launched by the then Minister for Housing, Local Government and Heritage, Darragh O’Brien, on 29 March 2024, and it has been described across the sector as the most significant change to Ireland’s fire safety regulations in over a decade. If you are a main contractor, an M&E firm, a developer or a project manager delivering a school or a retail unit, commercial fire protection in Ireland now means designing to a document that is materially different from the 2006 guidance many teams still have on the shelf. This is a practitioner’s guide to getting school and retail installations right, first time.

Which standard applies, and why it matters

The single most common and most expensive mistake we see is applying the wrong sprinkler standard. In Ireland, as in the UK, there are two design codes, and they are not interchangeable:

• BS EN 12845 (adopted in Ireland as I.S. EN 12845) covers automatic sprinkler systems in commercial and industrial buildings, including offices, shops, schools, warehouses, car parks and mixed-use developments. It classifies premises by hazard (Light Hazard; Ordinary Hazard OH1 to OH4; and High Hazard), and each class drives the design density, water supply and area of operation.
• BS 9251 covers domestic and residential occupancies such as houses, flats and care homes, and, relevantly for education, the residential parts of a building such as boarding accommodation and student dormitories.

For a school building or a retail unit, the non-residential fabric is designed to BS EN 12845. Schools and offices typically fall within the Light Hazard band, while sales floors usually sit in Ordinary Hazard because of the higher combustible load from stock and fixtures. Where a project mixes uses, such as a school with boarding or retail units with flats above, the residential parts are protected to BS 9251 and the commercial parts to BS EN 12845. Getting that split right at design stage avoids under-designed systems, insurance problems and rework at handover.

What TGD-B 2024 actually says about commercial buildings

TGD-B 2024 was a structural overhaul. Fire safety consultancy MKO notes that the largest additions to the regulations include three new sections covering smoke control systems, existing structures and sprinklers, meaning sprinklers now have their own dedicated section for the first time. The changes most relevant to commercial work are as follows.

• Shops. According to ORS, Ireland’s largest fire safety consultancy, the guidance has reduced the maximum shop compartment size associated with sprinkler protection from 4,000 m² to 2,000 m². In practice, larger retail floorplates are now far more likely to need sprinklers to achieve a workable compartmentation strategy.
• Shopping centres. TGD-B guidance states that a sprinkler system should be provided throughout any covered shopping centre, subject to defined exempted areas. If you are fitting out a unit inside a covered centre, sprinkler protection is effectively a given.
• Tall buildings. Sprinklers are required in buildings containing flats or student accommodation where the topmost floor exceeds 15 m, and for other non-residential uses where the topmost storey is above 30 m.

Importantly, TGD-B does not impose a blanket sprinkler requirement on every school in Ireland. That is a contrast with Wales, where sprinklers have been a condition of Welsh Government grant funding for all new school buildings and significant refurbishments since 2007, and with Scotland, where they are mandatory in new-build schools regardless of height. Most Irish schools are low-rise and will not trip the TGD-B height thresholds, so sprinklers are often a fire-engineered trade-off, an insurer or patron requirement, or part of a wider strategy rather than a strict obligation. That makes the reasoning behind a school system a conversation worth having early with the design team.

Best practice for schools

Schools are unusual sites, and the programme has to respect that.

• Work to the school calendar. The realistic windows for intrusive work are the summer, mid-term and Easter breaks. A large retrofit rarely fits inside a single summer break, so phasing (protecting block by block and decanting classes into modular units) is usually the pragmatic route. Lightweight CPVC pipework can shorten fire sprinkler installation time and reduce disruption compared with steel.
• Design for abuse. Classrooms, corridors and toilets see rough handling. Specify robust, tamper-resistant or recessed and concealed heads with guards where appropriate, particularly at low level and in areas prone to vandalism.
• Integrate with existing services. Retrofits into older Irish school stock mean coordinating around existing heating, ventilation, lighting and suspended ceilings, and confirming the water supply, since most systems need a dedicated tank and pump rather than a reliable mains connection.
• Get the hazard classification right. General teaching spaces are typically Light Hazard, but technology rooms, kitchens and boarding accommodation change the picture, since boarding is a residential occupancy under BS 9251.

The Irish context is live. In March 2026, a primary school in Co Kildare with around 400 children enrolled closed its building after a consultant’s report flagged serious fire door and fire safety compliance failures. It is a reminder that fire safety and its ongoing servicing in schools is a current, practical issue for boards of management, and that active suppression is only one part of a wider fire strategy.

Best practice for retail units

Retail is a coordination problem as much as a fire engineering one.

• Coordinate the fit-out early. Sprinkler layouts must be resolved against ceilings, HVAC, lighting and signage before they are finalised. Clashes discovered on site, such as ductwork or a feature ceiling fouling head positions, are a classic cause of retail programme slippage.
• Work within landlord and centre rules. In a shopping centre, the unit system usually ties into the centre’s infrastructure through zone valves, and testing, isolations and out-of-hours working are governed by centre management. Build those constraints into the programme from day one.
• Protect the look of the store. Concealed and recessed heads keep shopfronts and display areas clean while maintaining Ordinary Hazard coverage.
• Classify the risk honestly. A clothing rail, a stockroom and a fast-food unit are not the same hazard. The Ordinary Hazard sub-group drives water demand, and under-classifying is a compliance failure.

Frequently Asked Questions

Do schools in Ireland have to have fire sprinklers?

There is no blanket legal requirement for sprinklers in every Irish school. TGD-B 2024 requires sprinklers in specific situations, for example non-residential buildings with a topmost storey above 30 m, and most schools are low-rise and fall below those thresholds. In practice, sprinklers in schools are often a fire-engineered design decision, an insurer or patron requirement, or part of a wider fire strategy rather than a strict Building Regulations obligation. This differs from Wales and Scotland, where sprinklers are effectively mandatory in new schools. Irish boards of management also carry a duty of care under the Fire Services Act 1981.

What standard applies to a commercial or retail sprinkler system in Ireland?

Commercial and non-residential systems are designed to BS EN 12845 (I.S. EN 12845), which uses hazard classifications, namely Light Hazard, Ordinary Hazard and High Hazard, to set design density and water supply. Residential parts of a building, including boarding accommodation and student dormitories, are designed to BS 9251. In a mixed-use building, both standards apply, each to the appropriate part.

When is the best time to install sprinklers in an occupied school?

Intrusive works are best scheduled for the summer, mid-term or Easter breaks. Large retrofits rarely fit within a single summer break, so phased installation, protecting one block at a time and temporarily relocating classes, is usually the most workable approach. Lightweight pipework systems, such as CPVC, can reduce installation time and disruption compared with steel.

What changed for retail units under TGD-B 2024?

The 2024 guidance reduced the shop compartment size associated with sprinkler protection from 4,000 m² to 2,000 m², and confirmed that a sprinkler system should be provided throughout any covered shopping centre. Larger retail floorplates and units inside covered centres are therefore far more likely to require sprinklers, and fit-out teams should assume sprinkler coordination from the outset.

Getting it built

Whichever sector you are in, specify an installer with recognised third-party accreditation (LPCB / LPS 1048), insist on as-fitted drawings, hydraulic calculations and O&M manuals at handover, and factor annual inspection and testing into the building’s lifecycle. You can read more about our commercial fire protection solutions and about our installation service, from first design through to commissioning and maintenance. Fire safety works best when active suppression, passive protection and management procedures are designed as one system, not bolted on at the end.

Contact us today to chat about your next commercial installation.