Drilling and Boring Contractor Insurance
Drilling is a trade where you cannot see the thing that will cost you money until after you have hit it.
Rated On What You Did Before Drilling
A diamond driller cutting through a slab does not know where the post-tensioned cable or the main rebar runs unless somebody scanned it. A borehole rig does not know what service crosses the line unless somebody traced it. In both cases the drilling itself is routine and controlled, and the claim comes from what was behind the surface: a severed cable, a struck water main, a cut tendon that compromises a floor, or a gas service that turns a job into an emergency.
That is why this trade is underwritten on what you do before the bit turns, and why scanning records and service drawings matter more to an insurer than the size of your rig.
What Drilling Contractor Insurance Covers
Public liability
Injury and damage to other people's property, which here means the structure you drilled and everything concealed within it. £5 million is the practical floor and £10 million is standard on main contractor and utilities work.
Striking buried or concealed services
The claim this trade actually has. A severed power cable, water main, gas service or telecoms duct, with the cost being the repair, the disruption and sometimes the third party losses that follow an outage.
Damage to the structure drilled
Cutting reinforcement or a post-tensioned tendon can compromise a floor or a beam, and the remedy is structural rather than cosmetic. Whether the element you drilled counts as your work or as third party property varies between wordings.
Employers' liability
Compulsory from the first employee at a £5 million statutory minimum. Silica dust exposure from concrete cutting is a long tail health issue underwriters now ask about directly.
Plant, rigs and hired-in plant
Rigs, saws, generators and water management equipment, and anything hired, where the agreement usually makes you liable for full replacement value plus continuing hire charges.
Water damage and slurry management
Wet cutting produces slurry that goes somewhere. Water finding its way into floors below, into lift pits or into drains is a frequent and avoidable claim.
Professional indemnity where you advise
Ground investigation drilling produces data somebody designs from. If the logs were wrong or the sampling was misrepresented, the loss is financial and advisory.
Where The Cover Stops
Wordings differ between insurers, so treat these as the usual position rather than as universal fact. Where one of them matters to you, it is worth checking on your own schedule before you need to.
Failure to scan or trace
The condition that decides claims. Where a policy expects a scan or a service trace before drilling and none was carried out, a strike is both predictable and difficult to defend. Keep the scan output, not just the memory of having scanned.
Reliance on client drawings
Drawings are frequently wrong, particularly on older buildings and after previous alterations. A policy will not treat an inaccurate drawing as your defence if you did not verify on site, and the contract may put verification on you.
Underground work exclusions
Some wordings restrict or exclude work below a stated depth, or exclude damage to underground services specifically. On this trade that can remove the main exposure, so the clause has to be read.
Consequential loss from an outage
Cutting a cable that takes out power to a business park causes losses far beyond the cable. Consequential loss is frequently sub-limited or excluded, and it can dwarf the repair.
Silica dust and long tail health claims
Respirable crystalline silica from concrete cutting is a recognised long tail exposure. Water suppression, extraction and respiratory protection are controls insurers now expect to see evidenced.
Defective workmanship
Re-coring a hole in the wrong position is your cost. The structural damage the wrong hole caused may be covered, which is the usual dividing line.
The Scan Is The Whole Defence
Almost every expensive claim in this trade is a service strike, and almost every service strike is a scanning failure rather than a drilling failure.
Scanning with a cover meter, GPR or a cable avoidance tool before cutting is routine. What is not routine, and what decides claims, is keeping the output. A scan image saved against the job reference, dated, showing what you found and where you positioned the core, is the difference between a defensible claim and an indefensible one. A verbal assurance that the area was scanned eighteen months ago persuades nobody.
The same applies to the instruction. Where a client or main contractor marked the position and told you it was clear, get that in writing. Where you scanned and found something, record that you reported it and what you were told to do. Those two documents between them resolve most disputes about whether a strike was avoidable.
Post-Tensioned Slabs Are A Different Order Of Risk
Cutting a post-tensioned tendon is the one claim in this trade that can be structurally serious rather than merely expensive.
In a post-tensioned slab the steel is in tension, and severing it releases that energy and reduces the capacity of the floor. The consequence can be immediate, including injury, and the remedy involves structural engineering rather than patching. Buildings constructed from the 1970s onwards may contain post-tensioned elements and the drawings do not always say so.
Which is why the honest answer on an unfamiliar slab is to decline to drill until it has been properly investigated. That conversation is uncomfortable and it is far better than the alternative. Insurers and main contractors both regard a contractor who stops and asks as a lower risk than one who proceeds on an assumption, and it is worth saying so in writing when you do.
Where The Water Goes
Wet cutting is the standard method and the slurry it produces causes a steady stream of smaller claims that nobody budgets for.
Water follows the path of least resistance, which in a building means down: through the slab penetration you just made, into the ceiling void below, into a lift pit, or across a finished floor on the level beneath. In an occupied building that is damage to somebody's ceiling, carpet and equipment, and it is entirely foreseeable.
Control is unglamorous: ring bunds, vacuum extraction, a bung in the hole, and somebody on the floor below while you cut. Where slurry leaves site, remember it is not clean water, so discharging it into a surface drain is a pollution question rather than a housekeeping one.
Ground Investigation Produces Data, Not Just Holes
Contractors doing ground investigation drilling carry an exposure most liability policies were not written for.
The deliverable is a log: what was found at what depth, sample recovery, groundwater levels. Engineers then design foundations from it. If the logging was careless, samples were mislabelled, or depths were recorded wrongly, the design that follows is wrong and the consequence is structural remedial work. Nothing was damaged by the drilling, which is exactly why public liability does not answer it and professional indemnity does.
Firms that both drill and report frequently hold liability only. If you produce logs or interpretative reports, declare that half as well, and be precise in the report about what was sampled and what was inferred, because a log that reads as an assurance about ground conditions between boreholes is a larger promise than the work supports.
How To Choose A Broker For Drilling Work
The exposures here are concealed and the wording that matters is easy to miss. We are an FCA regulated broker and will not tell you we are the best choice. These are the questions that decide it.
Is damage to underground or concealed services covered?
Some wordings restrict or exclude it specifically, which removes the main exposure of the trade. Ask the question directly rather than assuming liability cover reaches it.
How is consequential loss from an outage treated?
Cutting a cable that takes out a business park costs far more than the cable. Consequential loss is frequently sub-limited, so ask for the figure.
What does the policy expect of you before drilling?
Scanning and service tracing may appear as conditions. You need to know exactly what is required and to be keeping the evidence, because a strike after an unscanned cut is hard to defend.
Is there a depth restriction?
Borehole and piling work can run past a stated depth limit in the wording, which is easy to miss and simple to check.
Has silica dust been discussed?
A long tail health exposure in a trade built on cutting concrete. A broker raising water suppression, extraction and respiratory protection is thinking about the claims that arrive in twenty years.
Is reporting separated from drilling?
If you produce logs or interpretative reports, that is advisory work needing professional indemnity alongside the liability.
Factually, here is what we do against those questions. We confirm whether damage to concealed and underground services is covered and what the consequential loss sub-limit is, we tell you exactly what the policy expects before you drill so you can keep the right evidence, we check for depth restrictions, and we separate ground investigation reporting from physical drilling so professional indemnity is a decision rather than an omission. We are a broker, so it goes to several insurers rather than one.
Drilling contracting is named in the appetite of one of the insurers we deal with. We also insure groundworkers, piling and structural steel contractors, so the work either side of yours is familiar ground.
What Moves The Price
Every policy is priced on the business behind it. These are the things that move the premium:
- Whether damage to concealed and underground services is included
- The consequential loss sub-limit
- Your scanning and service tracing procedure, and record keeping
- The depth and type of drilling, and any post-tensioned work
- Silica dust controls and health surveillance
- Turnover, plant values and hired-in plant
- Whether you produce logs or interpretative reports
- Claims history, particularly service strikes
We are a broker, so we take it to several insurers rather than quoting one. Call 02382 000820 for a quote.
What We Need To Quote
- The types of drilling you carry out and typical depths
- Your scanning and service tracing procedure before cutting
- Whether you drill post-tensioned or unfamiliar slabs, and your approach
- Water and slurry management arrangements
- Silica dust controls and any health surveillance
- Plant owned and hired, with values
- Whether you produce ground investigation logs or reports
- Any claims in the last five years, especially service strikes
Cover that often goes with this
The gaps we most often find sitting next to this policy.
- Groundworks contractorsExcavation alongside, and the same buried services.
- Demolition contractorsControlled sawing and structural cutting.
- Plant coverRigs and saws, owned and hired in.
- Professional indemnityFor ground investigation logs engineers design from.
- Public liabilityAnd whether it reaches underground services at all.
- Talk to a brokerAsk us whether concealed services are actually covered.
Common questions
What insurance do drilling contractors need?+
Public liability at £5 million as a floor and £10 million on main contractor and utilities work, and crucially one that covers damage to concealed and underground services, because some wordings restrict exactly that and it is the main exposure of the trade. Check the consequential loss sub-limit too, since cutting a cable that takes out power to a business park costs far more than the cable. Employers' liability is compulsory at a £5 million statutory minimum, with silica dust now a live underwriting question. Then plant and hired-in plant, and professional indemnity if you produce ground investigation logs.
Am I covered if I drill through a cable or a water main?+
Usually yes under public liability, provided the policy does not restrict damage to underground or concealed services, which some do. What decides the claim is whether the strike was avoidable, and that comes down to evidence: a dated scan image saved against the job showing what you found and where you cored, plus written confirmation of any position a client or main contractor marked as clear. A verbal assurance that the area was scanned persuades nobody. Also check the consequential loss position, because the repair is often the smallest part of the bill.
What happens if I cut a post-tensioned tendon?+
It is the one claim in this trade that can be structurally serious rather than just expensive. The steel is in tension, so severing it releases energy and reduces the floor's capacity, with the possibility of immediate consequences including injury, and a remedy that needs structural engineering rather than patching. Buildings from the 1970s onwards may contain post-tensioned elements and drawings do not always say so. The honest answer on an unfamiliar slab is to decline to drill until it has been investigated, and to put that in writing. Both insurers and main contractors treat a contractor who stops and asks as the lower risk.
Is water damage from wet cutting covered?+
Ordinarily yes as third party property damage, and it is the most frequent claim in the trade because water goes down. Through the penetration you just made, into the ceiling void below, into a lift pit, or across a finished floor on the level beneath, which in an occupied building means somebody's ceiling, carpet and equipment. The controls are simple and they work: ring bunds, vacuum extraction, a bung in the hole and somebody stationed on the floor below. Remember slurry is not clean water, so discharging it to a surface drain becomes a pollution question rather than housekeeping.
Do I need professional indemnity for ground investigation?+
If you produce logs or interpretative reports, yes. The deliverable is data engineers design foundations from: what was found at what depth, sample recovery, groundwater levels. If logging was careless or depths were recorded wrongly, the design that follows is wrong and the consequence is structural remedial work, with nothing damaged by the drilling itself. That is professional indemnity rather than public liability. Be precise in the report about what was sampled and what was inferred, because a log reading as an assurance about conditions between boreholes promises more than the work supports.
Who insures drilling and boring contractors in the UK?+
Drilling contracting is named in the appetite of one of the insurers we deal with, and the market is workable when the risk is described properly. What separates placements is wording rather than price: whether damage to underground and concealed services is covered, what the consequential loss sub-limit is, whether there is a depth restriction, and whether ground investigation reporting is covered alongside the physical work. Those four questions will tell you more about a quote than the premium will.
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