Piling and Foundation Contractors Insurance
Piling and specialist foundation work is one of the higher risk categories in construction, and insurers treat it that way. The work sits beneath everything else on the project, it is carried out with heavy rigs on ground that is often only partly understood, and when something goes wrong it usually affects property that does not belong to you.
Driven and vibrated piles can transmit vibration into neighbouring buildings. Bored and CFA piles can draw in soil, cause settlement or strike an obstruction nobody knew was there. Mini piling and underpinning bring the same risks into back gardens, basements and terraced streets, often within a few metres of occupied homes.
There is also a design element that many foundation contractors underestimate. Where you size the piles, choose the method or design the underpinning sequence, a pile that fails a load test or settles after completion can become a design claim rather than a workmanship one, and the remedial cost on a foundation is rarely small.
We can help you set out what you actually do, from small mini piling contracts to larger rig work, so that the liability, contract works, plant and professional indemnity covers are written for the methods you use and the contract conditions you sign, including any requirement to arrange JCT 6.5.1 non negligent cover.
Common claims and risk exposures
The exposures that produce claims in this trade, rather than a generic list.
Vibration and settlement damage to neighbours
Driven, vibro and sheet piling transmit vibration through the ground, and even replacement piling can cause settlement where soil is drawn in or ground water is lowered. Cracked plaster, sticking doors and stepped brickwork in the house next door are the typical result. Vibration monitoring, set trigger levels and a dated pre works condition survey are what allow these claims to be assessed fairly rather than settled on assumption.
Rig instability and overturning
A piling rig carries a high, heavy mast on tracks, and it depends on the working platform beneath it. A soft spot, a backfilled trench or an unrecorded void can let a track sink and the rig topple. The consequences reach operatives, other trades, neighbouring buildings and services, so insurers look closely at how working platforms are designed, certified and maintained.
Pile design and load performance
Many piling contracts place pile design with the contractor, based on site investigation data that may be limited. A pile that fails an integrity or load test, or a foundation that settles after the frame goes up, can lead to additional piles, redesign and delay costs across the whole project. That exposure belongs under professional indemnity, and public liability will not usually respond to it.
Underpinning existing structures
Underpinning means excavating beneath foundations that are carrying load, often in short sequenced bays. Opening too many bays at once, or leaving one open in wet weather, can let the structure move. The building being underpinned may be treated as property in your care, and the neighbour's attached house is very much a third party.
Spoil, obstructions and ground water
Bored piling produces arisings that may be contaminated and need classifying before disposal. Old foundations, timber piles and buried tanks stop augers and break tools. Drilling through an aquifer or a perched water table can create pollution pathways, which is an area where sudden and gradual pollution are treated very differently by insurers.
The cover we arrange
We arrange insurance around the work you carry out, the contracts you take and the sites you work on. The cover available will depend on the individual risk and the terms offered by insurers.
Public liability written for piling
General construction wordings often exclude piling or restrict it heavily, so the policy needs to name the methods you use. Limits of £5m to £10m are typical, and larger urban contracts may specify more.
- Third party injury and property damage
- Vibration, removal of support and settlement, where extended
- Damage to underground services
- Limits typically £5m or £10m
Non negligent cover (JCT 6.5.1)
Some contracts require the contractor to arrange insurance in joint names for damage to neighbouring property caused by collapse, subsidence, heave, vibration, weakening or removal of support or lowering of ground water, where nobody was negligent. Public liability will not normally pay unless you were at fault, so this is a separate placement.
- Arranged where the contract requires it
- Joint names with the employer
- Usually subject to an engineer's report
- Foreseeable or inevitable damage excluded
Employers' liability
A legal requirement once you employ people, and it can be arranged where required, subject to the policy terms. Underwriters focus on rig operator competence, exclusion zones around the rig and reinforcement cage handling.
- Rig operators, banksmen and labourers
- Labour only subcontractors under your direction
- Noise and hand arm vibration exposure
- Limit set by the policy, commonly £10m
Contract works
Covers piles, caps, ground beams and materials on site before handover. Damage from flooding of open bores, collapse of an uncased bore or storm damage to temporary works are the typical claims.
- Piles, caps and ground beams in progress
- Reinforcement cages and materials on site
- Temporary works and casings
- Defective work itself excluded
Contractors plant
Piling rigs, augers, CFA kit and mini piling rigs are high value and expensive to replace, and lead times on specialist rigs can be long. Hired in plant needs continuing hire charges included.
- Owned rigs and attachments, scheduled
- Augers, casings and tooling
- Hired in plant and continuing hire
- Breakdown where arranged separately
Professional indemnity
Needed where you design piles, select the piling method, design underpinning sequences or certify working platforms. It is written on a claims made basis, so cover has to be kept in place after the work is finished.
- Pile and foundation design
- Underpinning sequence and temporary works design
- Interpretation of site investigation data
- Claims made, continuity required
What an underwriter will ask
Having these to hand shortens the process considerably, and usually improves the terms.
- Turnover split between bored, CFA, driven, sheet, mini piling and underpinning
- Maximum pile depth and diameter, and rig sizes in your fleet
- How close you work to existing buildings, and whether neighbouring properties are occupied
- Your vibration monitoring practice and pre works condition surveys
- Who designs the piles and the working platforms, and whether platform certificates are issued
- Service location procedure before piling starts
- How contaminated arisings and ground water are handled
- Trade association membership and accreditation
- Plant schedule with values, and security on site
- Five years of claims, including neighbour complaints that did not become claims
What affects the cost of your insurance?
The main factors insurers consider when assessing the premium.
Method mix
Driven and vibrated piling near occupied buildings is viewed very differently from bored piling on an open site. A clear breakdown of turnover by method usually produces better terms than a single description of piling.
Proximity to neighbouring property
Work within a few metres of terraced or older buildings carries far more settlement exposure than greenfield work. Being honest about the split matters more than the total turnover.
Design responsibility
Whether you design piles in house, use an external engineer or work to a client's design changes the professional indemnity element considerably.
Monitoring and survey discipline
Documented vibration monitoring, condition surveys and working platform certificates show an underwriter how claims would be defended, and they carry real weight in this class.
Conditions and exclusions to consider
Terms vary between insurers, so treat these as the questions to ask rather than a description of any one policy.
Piling and underpinning excluded from general wordings
Many standard construction policies exclude piling, underpinning or both. A groundworker who has started doing mini piling may find that the cover in place simply does not extend to it. The activity needs declaring and writing in, ideally before the first rig arrives.
Vibration and removal of support
Damage caused by vibration or by weakening or removal of support is excluded or restricted on some public liability wordings unless specifically extended. For a piling contractor this is where the claims sit, so the extension is the first thing to check.
Non negligent damage
Public liability pays where you are legally liable. Where neighbouring property is damaged without negligence, the policy will not usually respond, which is why JCT 6.5.1 cover exists. Where the contract requires it and it has not been arranged, you may be in breach of contract.
Design under public liability
The cost of extra piles, redesign and delay where a pile design was inadequate falls under professional indemnity rather than public liability. Contractors who design without holding it have a gap exactly where the expensive claims are.
Gradual pollution and contamination
Sudden and accidental pollution affecting third party land may be covered. Gradual pollution, and the cost of dealing with contamination already in the ground, generally are not.
Common questions
Is piling covered by a standard construction policy?
Often not. Many general construction and groundworks wordings exclude piling and underpinning, or limit them to a small percentage of turnover. Because both involve deliberate work under or next to existing structures, insurers want them declared and rated. If you have moved into mini piling alongside other groundwork, it is worth checking the policy wording rather than the schedule description.
What is JCT 6.5.1 insurance and do I need it?
It is cover for damage to neighbouring property caused by collapse, subsidence, heave, vibration, weakening or removal of support, or lowering of ground water, where nobody was negligent. Public liability will not usually pay in that situation. Where a JCT contract requires the contractor to arrange it, you are obliged to do so, and it is typically placed in joint names with the employer. Insurers usually want details of the works and the neighbouring buildings, and may require an engineer's report before quoting.
My neighbour says our piling cracked their house. Am I covered?
If the damage was caused by your negligence and the policy includes vibration and removal of support, public liability would normally respond. The practical question is proof. Older properties often have existing cracks, and without a dated condition survey and vibration readings, it can be difficult to show which damage was already there. Notify your insurer early and avoid admitting liability on site.
Do piling contractors need professional indemnity?
In many cases, yes. Where you design the piles, choose the method based on the site investigation, or design underpinning sequences or working platforms, you are carrying design responsibility. If a pile fails a load test or a foundation settles, the cost of additional piles and delay falls under professional indemnity. Public liability responds to injury and property damage, which is a different question.
Does the policy cover a piling rig overturning?
Damage to the rig itself falls under contractors plant cover. Injury to employees falls under employers' liability, and damage to third party property or injury to others falls under public liability. Insurers will usually ask about the working platform, who designed it and whether a certificate was issued, so keeping those records for each site matters.
Is mini piling for house extensions insured differently?
It can be. Mini piling rigs are small, but the work often happens in tight gardens next to occupied homes, frequently on clay where settlement and heave are live issues. Insurers may treat it as a distinct activity from larger rig work. Domestic clients also tend to involve party wall procedures, and having the awards and schedules of condition on file helps if a claim arises.
How do I get a quote from True Risk Solutions?
Call 01304 262880 and speak to a broker, or email info@truerisksolutions.co.uk with what you do, what you need cover for and a phone number with the best time to call, and a broker will call you back. We need a phone number to quote, because the cover and the price depend on questions that are quicker to answer on a call than by email.
Speak to a specialist who understands your industry
Tell us about your business and the work you undertake, and we will come back to you with cover options built around it. Call 01304 262880, or email us with a phone number and the best time to call and a broker will ring you back.