Category: PI comparison · Reviewed by Jake Leat, Associate Director · Last reviewed May 2026
UK SMEs often refer to both Professional Indemnity (PI) and Public Liability (PL) cover using the same informal shorthand — “PII”, “liability insurance” or simply “the insurance the contract asks for”. In ordinary conversation the abbreviation “PII” can mean either Professional Indemnity Insurance or, less commonly, Public Liability. That ambiguity matters because the two policies respond to very different exposures, attach on different trigger bases and are written for different insureds.
This article uses PI to mean Professional Indemnity Insurance and PL to mean Public Liability Insurance throughout. It sets out the mechanical differences between the two covers, the areas in which they overlap and the questions to ask when placing or renewing either.
Most UK businesses encounter both PI and PL at some point — either through tender documents, professional body rules, lease clauses or supply contracts. Confusion between the two is common because both are “liability” products: both pay defence costs and damages owed to a third party. The difference lies in what kind of third-party claim the policy is designed to answer.
PI responds to allegations that a professional service was provided negligently and caused a third party (usually a client) to suffer financial loss. PL responds to allegations that the insured’s operations caused a third party to suffer bodily injury or property damage.
The comparison below is mechanical. It does not recommend buying one product over another, nor does it suggest that any firm should hold both — those are placement decisions that depend on the firm’s activities, contracts and regulatory position.
Insurance product lines are not always cleanly separated. The same exposure can sometimes be presented to more than one policy, the names brokers use vary by insurer, and the precise scope of cover always depends on the wording in front of you. Insurers may use slightly different terminology for substantially similar cover, and package products (such as Commercial Combined) routinely bundle PL with employers’ liability, property and sometimes PI under one schedule.
Where this article describes “typical” features, those are common market features only. The actual cover under any given policy is determined by its schedule, insuring clauses, definitions and exclusions.
The named insured under a PI policy is usually the firm itself — a company, LLP or sole trader carrying on a professional or advisory service. Partners, directors and employees are commonly included as additional insureds when acting in the course of the business. Some wordings also extend cover to sub-contractors used in the course of the insured’s work, though this is not universal.
PI is triggered by a third-party claim alleging civil liability arising from the conduct of the insured’s professional activities. Most UK PI wordings respond to claims arising from negligence, breach of duty, breach of contract, dishonesty of employees, libel and slander, and infringement of intellectual property rights — though the precise insuring clause varies between insurers and between professions.
Defence costs are typically covered in addition to the limit of indemnity, though some wordings include them within the limit. Where defence costs sit within the limit, every pound spent on legal fees reduces the amount available to pay damages.
PI is written on a claims-made and notified basis. The policy responds to claims first made against the insured, and notified to insurers, during the period of insurance (or during any agreed run-off). The date the underlying act, error or omission occurred is generally irrelevant to which policy responds, provided the retroactive date has been satisfied.
Limits are usually expressed “any one claim” or “in the aggregate”, or as a combination of both. Aggregate-only limits can be eroded by multiple claims in the same period.
Loss of documents, dishonesty of employees, court attendance compensation, and run-off cover on cessation are common extensions. Cyber-related extensions are sometimes offered, though specialist cyber cover is the usual route for first-party cyber costs.
Bodily injury and property damage are usually excluded from PI, on the basis that those exposures belong on PL or other policies. Insolvency, fraudulent conduct by the principals, fines and penalties, and contractual liability assumed beyond the insured’s professional duty are typically excluded.
The named insured is usually the firm. Directors, partners and employees acting in the course of the business are typically covered. PL is commonly bought by firms whose operations bring them into physical contact with third parties or third-party property — retailers, tradespeople, contractors, leisure operators, restaurants, manufacturers and offices that receive visitors.
PL responds to claims for bodily injury to a third party or damage to third-party property arising from the insured’s business operations. The claim is brought by the injured party (or by a property owner), not by a customer alleging negligent advice.
Defence costs are usually covered in addition to the limit of indemnity on PL policies, though, as with PI, this depends on the wording.
PL is generally written on an occurrence basis. The policy responds to bodily injury or property damage that occurs during the period of insurance, regardless of when the claim is first made. This means a policy in force when the accident happened may still be called upon years later, even after the firm has changed insurer or stopped trading.
Common limits are £1m, £2m, £5m or £10m “any one occurrence”, with no aggregate limit in many wordings. Construction, manufacturing and supply contracts commonly specify minimum PL limits.
Products liability cover (damage caused by goods supplied) is frequently combined with PL. Financial loss extensions, defective workmanship extensions and contingent motor cover are also common.
Pure financial loss not flowing from injury or damage is usually excluded — that exposure typically belongs on PI. Liability arising from the rendering or failure to render professional advice is also commonly excluded from PL.
There are zones in which a claim could be presented to either policy, depending on the facts and on the wordings:
| Dimension | Professional Indemnity (PI) | Public Liability (PL) |
|---|---|---|
| Trigger basis | Claims-made and notified | Occurrence |
| Nature of third-party loss | Financial loss from professional acts/errors/omissions | Bodily injury or property damage from operations |
| Who is the insured | The firm; partners, directors, employees acting in the business | The firm; partners, directors, employees acting in the business |
| Who typically brings the claim | A client or other party owed a professional duty | A visitor, member of the public, neighbour or property owner |
| Defence costs | Often in addition to limit; sometimes within limit | Often in addition to limit; sometimes within limit |
| Typical limit structure | Any one claim and/or in the aggregate | Any one occurrence; aggregate sometimes applied to products |
| Common exclusions | Bodily injury, property damage, insolvency, fraud, fines | Professional services, pure financial loss, contractual liability beyond common law |
| Retroactive date | Often applies | Not typically relevant |
| Run-off cover | Commonly required on cessation | Less commonly required separately |
Scenario 1 — Visitor trips on office mat. A client visiting the firm’s office trips on a loose mat in reception and breaks a wrist. The claim is for bodily injury arising from the firm’s premises. PL is the policy that responds. PI is generally not engaged because the loss is not financial loss arising from professional advice.
Scenario 2 — Tax advice causes overpayment of corporation tax. An accountancy firm’s advice causes a client to overpay corporation tax. The client sues for the financial loss. PI is the policy that responds. PL is generally not engaged because there is no bodily injury or property damage.
Scenario 3 — Surveyor damages a chandelier during inspection. A surveyor knocks a chandelier from a ceiling during a property inspection. The owner claims for the damaged chandelier. PL is the policy that responds to the property damage. If the surveyor’s subsequent report also overlooked a structural defect and the buyer sues for financial loss, that aspect could fall to PI.
Scenario 4 — Designer’s specification causes leak in completed building. A design consultant specifies a roof detail that fails after installation, causing water ingress. The building owner sues for remedial costs. The allegation is one of professional negligence in design, and PI is the policy commonly looked to. PL would generally not respond because the damage did not arise during the insured’s physical operations on site.
Scenario 5 — Contractor’s tool damages a wall during installation. A contractor’s drill cracks a tiled wall during installation. The customer sues for the damage. PL is the policy that responds. If the contractor was also providing design advice that proved negligent, a separate PI question may arise.
Firms whose operations expose them to both physical and professional risks commonly hold both lines — design-and-build contractors, surveyors, engineering consultancies, architects who carry out site inspections, healthcare professionals who treat patients in person, and many trades that provide advice alongside physical work. Lease clauses, supply contracts and professional body rules often drive the requirement.
Firms whose exposure sits primarily in one area may hold only one of the two. A pure-advice consultancy that meets clients only by video may face limited PL exposure; a tradesperson who provides physical services without giving advice may have limited PI exposure. Even where one cover is the principal exposure, contractual or commercial requirements may still drive the purchase of both.
A broker placing both lines is well placed to review the wordings together — checking that exclusions on one policy are answered by cover on the other where possible, that limits are coordinated across sections, and that any contractual or regulatory minimums are met. Apex Insurance Brokers Limited arranges both PI and PL for UK firms; placement is one of several options available to a UK business, and the right structure depends on the firm’s activities, contracts and risk appetite.
Is “PII” the same as PI? “PII” is colloquial. It is most commonly used in the UK to mean Professional Indemnity Insurance, but some speakers use it for Public Liability Insurance or for liability cover generally. To avoid confusion, this article uses PI for Professional Indemnity and PL for Public Liability.
Is Public Liability compulsory in the UK? PL is not compulsory by statute for most businesses (the compulsory line for employers is Employers’ Liability). PL is, however, very commonly required by clients, landlords, professional bodies and tender processes.
Is Professional Indemnity compulsory in the UK? PI is compulsory for certain regulated professions (for example solicitors under SRA rules, architects under ARB rules, financial advisers under FCA rules). For other professions PI is contractual or commercial, not statutory.
Can I buy PI and PL on one policy? Many SME placements combine both lines on a Commercial Combined or Combined Liability policy. Standalone placements remain common where the exposure on one line is unusual or specialised.
Why are the trigger bases different? The trigger reflects the nature of the loss. Bodily injury and property damage occur at a fixed moment in time, which suits an occurrence trigger. Professional negligence may not surface for years and is hard to assign to a single moment, which suits a claims-made trigger.
Which policy responds if my client sues for both injury and financial loss? That depends on the facts and the wordings. Many wordings contain professional services exclusions on PL and bodily injury exclusions on PI specifically to allocate such claims. A broker reviewing the schedules can map likely allocation in advance.
Do I need run-off on PL? Run-off is more commonly discussed in the context of PI, because PI exposures can surface years after a firm stops trading. PL exposures are usually answered by the policy in force when the accident occurred, so dedicated run-off is less commonly arranged — though specific facts should be reviewed.
What if my contract specifies “PII” without saying which? Ask the counterparty to clarify. In UK contracts “PII” most often means Professional Indemnity, but the certificate of insurance you provide will be examined against whatever cover the contract actually requires, so verifying the intended cover before the certificate is issued avoids dispute later.
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About Apex Insurance Brokers — Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority, FCA firm reference 724952. Registered in England and Wales, Companies House 07014570. Last reviewed: May 2026.
Apex Insurance Brokers serves UK professional services firms and commercial businesses. Call 0117 325 0027, email hello@apexinsurancebrokers.co.uk, or request a quotation.
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