What Evidence Protects You After a Utility Strike on a UK Infrastructure Project?

After a utility strike, the evidence that protects contractors includes verified PAS 128 survey records, Permit to Dig documentation, marked-up detection drawings, site briefings, control verification records, and photographic evidence of excavation sequencing. Without documented proof of investigation and coordination, liability becomes significantly harder to defend.

AKN Site Engineer, Documenting exposed services on site — photographic evidence of excavation sequencing and service location is a core part of any defensible utility investigation record.

Why Utility Strike Disputes Escalate Quickly

When a service is damaged on site, the first question from an insurer, client, or HSE investigator is rarely 'how did it happen?'

It's: what investigation was carried out before excavation?

If the answer is vague — or the paper trail is thin — responsibility shifts fast. The project that had every intention of doing things properly can find itself in a difficult position simply because the right records don't exist or can't be located quickly.

That's the commercial reality of utility strikes on UK infrastructure and highways projects. The risk isn't just physical. It's contractual, financial, and reputational.

What Investigators and Insurers Actually Look For

In practice, disputes and notifications tend to focus on a consistent set of questions:

?  Was a Desktop Utility Search (PAS 128 Type D) completed and current?

?  Was PAS 128 detection (Type B) commissioned before excavation?

?  Were services marked clearly on the ground and on CAD drawings?

?  Was a Permit to Dig raised, signed, and retained?

?  Were operatives briefed, with toolbox talk records kept?

?  Was the excavation method appropriate to the ground conditions and service risk?

Guidance published under HSE HSG47 — Avoiding Danger from Underground Services — makes clear that detection, marking, and safe systems of work are required before excavation begins. This isn't advisory best practice — it sits alongside duties under the Health and Safety at Work etc. Act 1974 — which places a legal obligation on employers and those in control of work to manage foreseeable risks.

The Documents That Matter Most

These are not administrative extras. Each one serves a specific purpose in demonstrating that reasonable steps were taken:

✔  PAS 128 survey report and CAD drawings — evidence that physical detection was carried out

✔  Detection methodology statement — confirms which methods were used and why

✔  Permit to Dig form — signed, dated, and retained

✔  Toolbox talk records — proof that operatives were briefed before work began

✔  Mark-up and control verification photographs — demonstrates services were located and marked on site

✔  ITR hold points — shows the inspection and test regime was followed

✔  Control verification notes — confirms alignment between drawing and physical marking before excavation

Taken together, these create a defensible audit trail. Any single item missing weakens the overall position.

Where Projects Become Exposed

The projects we see get into difficulty rarely failed on one thing. The common thread is missing traceability — a series of small gaps that individually seem minor but collectively leave a project without a coherent story to tell.

Typical exposure points include:

• Detection carried out informally, or by operatives without documented methodology

• Utility records relied upon without physical verification

• Service markings not refreshed after programme delays or ground disturbance

• Excavation packages working outside agreed areas without updated detection

• CAD drawings that don't align with what was physically marked on site

When these gaps exist, the documentation that should protect the project becomes the thing that exposes it.

The Commercial Impact of Weak Evidence

The consequences of a poorly documented utility strike extend well beyond the immediate repair cost:

• Liability disputes that run for months and consume management time

• Insurance notifications that affect future premiums and cover

• Programme stalls while investigations are completed

• Client confidence damaged — particularly on frameworks and repeat work

• Final account disputes where causation and responsibility are contested

Professional standards promoted by the Institution of Civil Engineers (ICE) — reinforce that competent engineering practice includes proper documentation and verification as core obligations, not optional extras.

How to Protect Your Project Before Anything Goes Wrong

The best position to be in after a utility strike is one where the documentation is complete, consistent, and readily available. That means building the audit trail from the start — not assembling it after the event.

✔  Commission PAS 128 early — before design is fixed and certainly before excavation

✔  Verify control on the ground before any digging starts

✔  Align CAD outputs with physical marking — don't let the two diverge

✔  Keep photographic records at every key stage

✔  Store permit records centrally so they can be retrieved immediately

✔  Refresh detection if the programme changes, ground is disturbed, or design is revised

A Note on Limitations — and What Evidence Actually Does

PAS 128 reduces risk. It does not eliminate it. Not all utilities are detectable by any method. Depths can vary from records. Third-party drawings may be incomplete or inaccurate.

Evidence doesn't protect against perfection — it protects against the allegation that no reasonable steps were taken. On any well-run UK infrastructure or highways project, that's the standard being applied.

Planning works around buried services? Visit www.aknengineering.co.uk or☎️ call us to discuss your requirements on 01279 927 033.