Minimum insurance levels for contractors: what is law and what is contract?

There is no one universal insurance figure that makes every Great Britain contractor suitable for every job. The main statutory number is that an employer generally needs at least £5 million employers' liability (EL) cover from an authorised insurer, subject to the legal exemptions. Public liability (PL), professional indemnity (PI), product liability and specialist covers are commonly required by a client or contract, but their limits depend on the work, exposure and contract terms. A buyer should set and check the requirement for the actual scope. A contractor should read the policy schedule and exclusions, not just the headline limit.

GOV.UK's employer guidance states the £5 million EL minimum in England, Scotland and Wales for employers to whom the duty applies. The 1998 regulations specify the compulsory amount. HSE advises that more may be needed depending on risks and liabilities. This does not make £5 million an automatic PL or PI requirement, and it does not mean that a buyer must accept the legal minimum for a hazardous contract. Read the tender, client specification, insurer's policy and legal rules separately.

A simple way to classify insurance requirements

This is a selection framework, not a prescription for the same policies on every job. An insurance broker or lawyer should interpret unusual exclusions, design liability, subcontracting arrangements, jurisdiction or wording. A buyer may also require an indemnity to principals, joint-names policy or specified run-off period; those are contract questions, not solved by the face value on a certificate.

The employers' liability baseline

Most GB employers need EL insurance as soon as they become employers. GOV.UK describes the £5 million minimum and some exceptions, including certain businesses employing only specified family members and employees based outside GB. Do not decide exemption simply from “sole trader” on a form: a sole trader can employ people, and a limited company with family members may not meet the same exemption. Check the actual employment relationship and current statutory exceptions.

The certificate must be available to employees and to inspectors on request under the relevant rules. HSE's employer guide notes that £5 million is the minimum and risk may justify a higher limit. For onboarding, obtain the certificate, confirm it names the contracting employer, that it is in force for the work period and that any group arrangement genuinely covers that entity. A screenshot of an insurer logo or an expired certificate is not evidence. If the contractor uses labour from another entity, establish who employs those workers and which policy responds.

This is a legal minimum for EL, not a blanket guarantee that all claims are covered. Policy wording, insurer authorisation and exclusions still matter, as do whether the work involves people who are employees for insurance purposes. Where the position is unclear, obtain qualified insurance advice rather than accepting a checkbox.

Why public liability has no single answer

PL can be essential commercially even where not generally compulsory for an ordinary GB contractor. A client may set £1 million, £2 million, £5 million or more based on the project and contract; these are examples of contractual choices, not national legal minima. Actual public-sector documents illustrate variation: one published construction contract required £5 million third-party cover, while another required £10 million PL. The point is not to copy either figure. It is to obtain the requirement from the current contract and assess the job's exposure.

Ask what could be damaged and who could be harmed: work in an occupied home, near the public, on a high-value or historic building, at height, around buried services or with fire/heat can change both potential loss and insurer appetite. Then check whether the policy actually covers the activity. A £10 million PL schedule that excludes the planned work can be less useful than a lower but appropriate policy if the contract permits it. Confirm the basis of limit (per occurrence or aggregate), any sublimits, excess, and whether principal/client conditions are met.

Where a buyer sets a requirement, document why it fits the contract and communicate it before tender or appointment. A figure copied from another client may be disproportionate for a small job or too low for a complex one. The procurement or contract team and broker should agree the position; a content article cannot underwrite the work.

Professional indemnity and the design boundary

PI is particularly relevant where a contractor designs, specifies, surveys, certifies, gives professional advice or accepts design responsibility. A construction contractor that only builds to an employer's design may have a different exposure from one offering design-and-build. Read the contract: phrases such as “design responsibility”, “fitness for purpose”, “professional services” or delegated design may affect the policy needed and whether it responds. PI is often written on a claims-made basis, so the date of an act, retroactive date, continued cover and any required run-off period matter. Do not assume a one-year certificate protects a past design indefinitely.

No single PI amount applies to all contractors by general GB law. The client may specify a limit and period, or the contractor and broker may choose one for their exposure. Check that the insured professional activity and entity match the contract. If a trade subcontractor uses a specialist designer, clarify whose PI covers the design and whether the main contractor's contractual liability remains wider than the specialist's insurance.

Specialist and product covers

Product liability may be relevant when a contractor supplies manufactured or imported items, especially if a failure could injure someone or damage property. Contract works insurance may cover works during construction; plant cover, hired-in-plant cover, motor insurance and other specialist policies address different assets and circumstances. A policy called “contractor insurance” is often a bundle, but the sections, insured activities and exclusions vary. Ask for the schedule and policy wording where the exposure warrants it; a summary certificate is only a starting point.

For example, a scaffolding contractor's work-at-height exposure, a fire-stopping contractor's product/installation liability and a design consultant's PI exposure are not interchangeable. Do not infer that an SSIP or trade accreditation confirms the required insurance. It may ask for evidence but the buyer still needs to read the actual policy relevant to its contract.

A practical contractor insurance review

1. Define scope. What will the contractor and its subcontractors actually do, where and for how long? Identify design, hazardous, product and public interfaces.
2. Read the binding requirement. Pull policy types, limits, period, geography, indemnity wording, run-off and evidence requirements from the current contract or tender. Separate these from statutory EL.
3. Ask for evidence. Collect current certificate/schedule and, for material risks, the relevant policy wording or broker confirmation. Check legal entity, insurer, dates, limits and exclusions.
4. Compare to the job. Does the schedule cover the trade, method, site, height/depth, heat, subcontracting and any other specified activity? A policy limit does not override an exclusion.
5. Resolve gaps before mobilisation. Obtain endorsements, increased cover, revised scope or a buyer-approved exception. Record who approved the decision; do not silently lower the requirement in a software field.
6. Monitor through the job. Policies can renew or lapse during a long contract. Check new certificates and changes in scope rather than relying on the original onboarding PDF.

This review is not a substitute for a broker checking coverage. It is an operational checklist for avoiding a mismatch between the work authorised and the insurance presented.

Example: a refurbishment contractor on an occupied site

A contractor will alter rooms in an occupied building and has employees. The buyer checks EL at the applicable legal minimum and the contract's higher amount if specified. The job also requires PL at the buyer's contract limit because residents and their belongings may be affected. The schedule shows the limit, but the insurer excludes a particular hot-work activity. The contractor's proposed method includes that activity. The buyer does not approve work just because the total PL figure is high; it asks the contractor and broker to resolve the exclusion or changes the method under an approved plan. If the contractor designs a new structural detail, the buyer separately checks design responsibility and PI. A renewal falls midway through the job, so the buyer records a follow-up before expiry. None of these decisions can be made by checking “insured: yes”.

Common mistakes

• Presenting £5 million EL as if it were a universal PL, PI or every-contractor requirement.
• Assuming a sole trader is exempt from EL without checking whether they employ anyone.
• Selecting an arbitrary PL limit without reading the current contract and project exposure.
• Looking only at the headline figure while ignoring insured activity, exclusions, dates or entity.
• Treating a certificate upload as proof that a new work scope is covered.
• Forgetting design responsibility, subcontractors, run-off or claims-made PI.
• Letting a policy lapse mid-project because onboarding was done once.
• Promising that software verifies insurance coverage or legal adequacy without broker review.

The Complys contractor compliance page is the relevant commercial destination for organising contractor evidence and expiry review. Confirm implementation and terms before claiming that a live feature validates exclusions or guarantees a contractor is insured for a particular activity. The contractor network guide describes the existing marketing workflow; this article's distinct job is helping buyers determine and check which insurance requirement applies. Keep a human buyer/broker decision for coverage gaps.

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