Industry Insight
Ireland is committed to building 300,000 new homes by 2030 and has earmarked over €12 billion for water infrastructure alone. Before a single foundation is poured, we must confront a more fundamental challenge: the limits of what we know about what lies beneath our feet.
Utilistics Team · June 2026 · 14 min read · Infrastructure & Surveying
Estimated annual global cost of utility strike damage
Common Ground Alliance, 2021
Ratio of total to direct costs when a utility is struck
Univ. of Birmingham, 2018
Uisce Éireann combined investment plan, 2025–2029
Uisce Éireann, 2025
Utility strikes occurring annually in Ireland
Engineers Ireland Journal, 2026
Most engineering challenges are visible. You can measure a span, test a material, or model a load. But the moment a project interacts with the ground, the conversation shifts from engineering to epistemology, the study of what we know, how we know it, and where uncertainty hides.
Ireland’s underground utilities sit at the centre of that shift. They are essential, extensive, and often poorly documented. The difficulty is not that they are buried; it is that the information about them is inconsistent, incomplete, or ambiguous. And as the country enters one of the most ambitious phases of infrastructure expansion in its history, with a €275.4 billion National Development Plan running to 2035, the stakes of getting this wrong have never been higher.
01 – Historical Context
Ireland’s buried infrastructure was never built as a single, unified network. It accumulated in layers across more than a century of independent decisions: early water and sewer lines installed before modern surveying existed; telecommunications added in successive waves as technology evolved; private services installed without long-term documentation; and emergency repairs that prioritised speed over record accuracy.
The result is a landscape where physical assets are real but information about them is fragmented. Even when records exist, they often reflect the tools of their era hand-drawn sketches with approximate offsets, incomplete updates after maintenance works, or plans that were never transferred when organisations changed.
Irish Research Finding
A Springer Nature study on Irish construction practice found “no as-built drawings” to be one of the three primary causes of underground utility strikes in Ireland, alongside inadequate scanning and failure to study key indicators before excavation.
02 – Risk Typology
In most engineering domains, uncertainty can be quantified. Underground, it behaves more like a blind spot. A pipe may exist but be undocumented. A duct may be shown on a drawing but never built. A chamber may have been relocated decades ago without record. A signal detected by radar may represent one asset or several.
This is not just missing data, it is ambiguous data, which is far harder to manage. When uncertainty is buried, it tends to reveal itself only when excavation begins. By then, the consequences are immediate: delays, redesigns, safety risks, and contractual tension.
Ratio of total costs to direct repair cost, based on 16 UK case studies (Makana et al., University of Birmingham, 2018)
Total ratio = 29:1 · Source: Makana, L. et al., University of Birmingham (2018)
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Utility strikes remain one of the most preventable yet persistent hazards on construction sites. In Ireland alone, thousands of incidents occur annually, causing project delays, repair costs, and serious safety risks. The root cause is often the same: inaccurate or incomplete records of what lies beneath the surface.
03 – Standards & Classification
A common misconception is that a utility survey aims to produce a perfect map. In reality, it aims to produce a transparent model of confidence. Every line on a utility drawing carries a story: how it was detected, how strongly, how it correlates with existing records, and whether its depth is measured or inferred.
PAS 128, the British Standards Institution specification for underground utility detection, first published in 2014 and revised in 2022, structures utility surveys into four quality levels, each defined by the methods used and the confidence they deliver.
Classification of underground utility surveys by evidence type and confidence level
| Level | Type | Method | Confidence |
|---|---|---|---|
| QL-D | Desktop Study | Existing records only | Lowest – may be outdated |
| QL-C | Site Reconnaissance | Visual surface inspection | Low – no subsurface detection |
| QL-B | Detection | GPR, CAT & Genny | Moderate–high – most projects |
| QL-A | Verification | Trial holes or vacuum excavation | Highest – high-risk projects |
Source: PAS 128:2022, BSI / CICES Client Specification Guide, September 2022
04 – Technology & Interpretation
Tools like GPR, electromagnetic locators, GNSS, total stations, and LiDAR have transformed how we observe the subsurface. But technology alone does not solve the underground problem. Sensors detect signals. Humans interpret meaning.
Interpretation requires understanding soil conditions, recognising signal distortions, correlating multiple datasets, and critically distinguishing between absence of evidence and evidence of absence. The underground is a noisy environment. The skill lies in turning that noise into structured, reliable knowledge.
Share of excavation damage incidents by utility category (CGA / HSENation data — Irish distribution may vary)
Source: Common Ground Alliance DIRT Report; HSENation Safety Analysis
05 – Culture & Incentives
For decades, underground uncertainty has been treated as an unavoidable part of construction. This mindset pushes risk downstream, from planners to designers, from designers to contractors, and ultimately to the people operating machinery on site. It is a form of deferred accountability, and it is expensive.
A healthier approach begins with earlier, more rigorous questions: What information exists, and how reliable is it? What assumptions are being made without evidence? What are the consequences if those assumptions are wrong? What level of understanding does this project genuinely require?
Irish Regulatory Context
The HSA Code of Practice for Avoiding Dangers from Underground Services (2016) sets out obligations for all those planning and executing excavation work in Ireland. Research into compliance found that the three leading causes of strikes, inadequate scanning, missing as-built drawings, and failure to study key site indicators, remain stubbornly persistent.
06 – Epistemic Risk
Engineering often deals with technical risk: loads, materials, tolerances. But underground utilities introduce epistemic risk – risk created by incomplete knowledge itself. Epistemic risk is dangerous because it is invisible until it becomes unavoidable. A mislocated pipe does not cause problems until the moment it is struck.
Utility surveys are structured attempts to reduce epistemic risk by gathering evidence, validating assumptions, exposing uncertainty, and creating shared understanding across teams. This is not simply a commercial function. It is a knowledge function and it belongs at the earliest stages of project planning.
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The total cost ratio – indirect and social costs relative to the direct cost of repair – is 29:1. There is a very substantial impact which, to date, has been largely neglected.
07 – Ireland’s Infrastructure Moment
The scale of Ireland’s current infrastructure programme makes this discussion urgent. Uisce Éireann invested a record €1.372 billion in water and wastewater infrastructure in 2024 alone, laying or rehabilitating 207 km of water mains. Its 2025–2029 strategic funding plan sets a capital requirement of €10.3 billion, with a further €2 billion ring-fenced under the NDP for housing delivery.
Across transport and energy, the picture is equally significant. Ireland’s grid investment programme for 2026–2030 runs to €18.9 billion and includes new underground cable infrastructure across the country. MetroLink a €12 billion underground rail project beneath Dublin is planned to begin construction from 2028.
Every one of these projects will interact with existing underground utilities. The decisions made today about how we survey, document, and share underground information will determine the safety, efficiency, and cost of each one.
Key allocations with significant underground utility implications, 2024–2030
Sources: NDP Review 2025; Uisce Éireann 2025; CRU Price Review 6; Lexology Infrastructure Outlook 2025
Closing Reflection
Every buried asset reflects a decision made by someone, somewhere, at some point in time. The ground preserves those decisions long after the drawings fade or the organisations that made them have changed beyond recognition.
Understanding the underground is ultimately an act of reconstruction, piecing together history, evidence, and interpretation to create clarity where none existed. The more honestly we confront uncertainty, the more safely and intelligently we can build above it.
As Ireland commits to the largest infrastructure programme in the history of the State, the professionals who map, classify, and communicate what lies beneath are not supporting players. They are the foundation on which everything else rests.
References & Sources
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