Professional Indemnity Insurance UK Guide

Editorial attribution: Professional Insurance UK Editorial Team
Editorial review: 28 June 2026

Professional indemnity insurance—often shortened to PI insurance or PII—is a form of liability insurance for businesses and professionals whose advice, designs, specifications, reports or other services may cause a client or another party financial loss.

It can help with the cost of defending an allegation and, where the policy responds, compensation or settlement. It does not guarantee that every complaint, mistake, contractual dispute or loss will be covered. The policy wording, schedule, endorsements, limits, excess, dates and notification conditions all matter.

Quick answer: PI insurance is most relevant where a business is paid for knowledge, judgement, advice, design, analysis or a specialist service. Some firms must maintain it under regulatory or professional rules. Others buy it because a client contract requires it or because an error could create a significant financial claim.

This guide explains the main UK concepts. It is general educational information, not a recommendation of a policy, insurer or cover limit. Read the Insurance Information Disclaimer and check current rules and your own policy documents.

What professional indemnity insurance is

The Financial Conduct Authority describes PII as liability insurance for firms when a third party claims to have suffered loss, usually because of professional negligence. The Association of British Insurers similarly describes it as cover for compensation arising from negligent services or advice.

The central risk is usually not accidental injury or physical property damage. It is that a client says the professional work was wrong, incomplete, late, misleading or below the standard expected, and that this caused financial loss.

Examples of work that can create this exposure include:

advice about business, finance, technology, marketing, compliance or operations;
architectural, engineering, surveying or other design work;
reports, valuations, calculations, specifications or certifications;
software development, systems implementation and technical consultancy;
accountancy, legal, financial or other regulated professional services;
project management and contract administration;
creative work involving intellectual property or confidential material;
training, recruitment or outsourced specialist services where a client relies on professional judgement.

A claim may be justified, partly justified or unfounded. Defence costs can arise before liability is established. Whether those costs are covered, and whether they sit inside or outside the limit, depends on the contract.

What PI insurance may cover

A typical PI policy may respond to civil liability arising from professional services, but the scope varies materially. Depending on the wording, the policy may address allegations such as:

professional negligence;
an error or omission in advice, design, calculations or documentation;
negligent misstatement or misleading information;
failure to deliver an agreed professional service to the required standard;
breach of professional duty;
loss of documents or data entrusted to the insured;
unintentional infringement of intellectual-property rights;
breach of confidentiality;
defamation or similar media liability;
dishonesty by an employee where the insured business itself was not involved;
costs incurred to mitigate or correct an error with the insurer’s agreement.

This is not a standard list that applies to every PI policy. Some of these items are included only by extension, only for specified occupations, or only subject to sublimits and conditions.

Read What Professional Indemnity Insurance Covers for a more detailed breakdown.

What PI insurance does not automatically cover

Common limitations or exclusions may include:

a matter known before the policy began that should have been disclosed or notified;
work outside the business activities stated in the schedule;
deliberate, fraudulent, criminal or dishonest conduct by a principal;
fines, penalties or liabilities that cannot lawfully be insured;
guarantees of performance or contractual liabilities beyond the duty that would otherwise exist;
the cost of redoing defective work where no covered third-party loss has arisen;
trading losses, fee disputes or a client’s refusal to pay;
insolvency or inability to complete the work;
bodily injury or physical property damage better addressed by another liability section;
employment disputes, directors’ liabilities or cyber incidents outside the PI wording;
claims connected with sanctions, asbestos, cladding, pollution or other restricted activities;
losses above the limit, below the excess or outside the territorial and jurisdictional scope.

Exclusions can be broad, narrow or modified by endorsement. Never assume a policy covers a risk because another provider’s summary does.

Claims-made cover

Many professional indemnity policies are written on a claims-made basis. That means the policy in force when the claim is made—or when a circumstance is notified—may be the relevant policy, rather than the policy that existed when the work was done.

The SRA minimum terms provide a clear regulated example: cover applies where a claim is first made during the insurance period, or where a later claim arises from circumstances first notified during that period. ARB guidance also explains that architects’ PI policies are written on a claims-made basis.

For a general business policy, check:

the definition of a claim;
the definition of a circumstance;
when and how notification must be made;
whether notification must be made “as soon as practicable”, immediately or within another period;
whether the insurer’s prior consent is required before admitting liability, appointing advisers or incurring costs;
how the policy treats claims arising from one cause or series of related acts.

A late or incomplete notification can create a dispute. A complaint, demand, threatened action, serious error or facts likely to give rise to a claim may need to be considered before renewal, even if no formal proceedings have begun.

Retroactive dates and previous work

A claims-made policy may include a retroactive date. Work performed before that date may fall outside cover, even if the claim is first made during the current policy period.

Possible arrangements include:

full retroactive cover, with no stated date;
a date matching the start of the business or the first PI policy;
a later date that leaves earlier work uninsured;
specific restrictions for acquired businesses, new services or prior entities.

When moving insurer, changing legal entity or buying PI for the first time, check whether continuous cover for previous work is preserved. Do not assume that a new policy automatically follows all past activities.

Run-off cover

Claims can emerge after a business has stopped trading, retired, merged, sold a practice or stopped offering a service. Run-off cover keeps claims-made protection in place for past work during a defined later period.

Some regulators and professional bodies specify run-off arrangements. For example, the SRA minimum terms provide six years of run-off cover for relevant ceased practices, while ICAEW’s current rules require prescribed arrangements for firms subject to its regime.

For businesses without a formal rule, the appropriate period depends on matters such as:

contractual limitation periods;
how long errors may remain undiscovered;
the type and duration of projects;
record-retention obligations;
professional-body expectations;
the firm’s legal structure and closure arrangements.

Run-off is not merely an administrative extra. Without it, a later claim may arrive when no active policy responds.

Defence costs, compensation and settlements

PI insurance can involve several different amounts:

legal costs for investigating and defending the allegation;
expert or technical costs;
compensation awarded by a court;
a settlement agreed with the insurer’s consent;
claimant’s costs where legally payable;
mitigation or rectification costs where the wording expressly allows them.

Check whether defence costs are:

included within the indemnity limit;
paid in addition to the limit;
subject to a separate limit;
reduced by the excess;
controlled by the insurer through panel solicitors or consent conditions.

A policy with a £1 million limit does not necessarily provide £1 million for compensation after defence costs. Aggregation wording may also treat several allegations as one claim.

Limits of indemnity

PI limits are commonly expressed in one of two ways:

any one claim: the limit can apply separately to each covered claim, subject to wording and any overall cap;
aggregate: the limit is the maximum for all covered claims during the period.

Some policies combine an any-one-claim limit with aggregate sublimits for particular risks. Others include defence costs inside the limit.

The appropriate limit cannot be chosen by turnover alone. Factors may include:

the maximum financial loss a client could suffer;
the value and duration of contracts;
contractual indemnities and liability caps;
regulator or professional-body minimums;
whether defence costs erode the limit;
exposure to multiple claims from one systemic error;
the number and type of clients;
work performed outside the UK;
past work and run-off exposure.

A client asking for a particular limit does not prove that the limit is adequate for every exposure. Equally, a high limit does not correct a gap in activities, exclusions or retroactive cover.

Excesses

The excess is the amount the insured must bear before the insurer pays, subject to the wording. It may apply:

once per claim;
once per claimant;
to damages but not defence costs;
to defence costs as well as damages;
at a higher level for specified work.

A higher excess may reduce the premium, but the business must be able to fund it when a claim arises. Some professional rules limit the excess that a regulated firm may carry.

Who may need PI insurance

PI is especially relevant for businesses that:

provide advice or recommendations;
design, specify, calculate or certify;
prepare reports or professional opinions;
manage projects or client money;
handle client documents, data or intellectual property;
make decisions on which a client relies;
subcontract specialist work while remaining responsible to the client;
sign contracts requiring PI insurance;
belong to a profession with compulsory insurance rules.

It is not generally a universal statutory requirement for every UK business. The requirement may instead arise from a regulator, professional body, licence, scheme, client contract or procurement framework.

Examples include SRA-authorised law firms, ICAEW members in public practice, RICS-regulated firms and architects expected to maintain adequate and appropriate cover under ARB standards. Certain FCA-regulated firms are also subject to Handbook PII requirements.

Read Who Needs Professional Indemnity Insurance? for the requirement framework.

PI insurance for freelancers, contractors and limited companies

The professional risk comes from the work, not only from the business structure.

A sole trader can face a claim personally because there is no separate company. A limited company is a separate legal person, but that does not remove the company’s liability or guarantee that directors, employees or subcontractors will never be named.

Freelancers and contractors may encounter PI requirements in:

consultancy agreements;
agency terms;
public-sector frameworks;
supplier onboarding;
professional memberships;
contracts that require insurance to remain in place after completion.

Check who the insured is. The schedule may need to include the company, trading names, partners, directors, employees, predecessors or subsidiaries. Do not assume a policy bought in one name protects every connected entity.

PI insurance and subcontractors

Using subcontractors does not necessarily transfer the client-facing responsibility.

Questions to examine include:

Does your contract make you responsible for the subcontractor’s work?
Does your PI policy cover work performed by subcontractors on your behalf?
Must the subcontractor carry its own PI insurance?
Is there a right to recover from the subcontractor if its error causes the claim?
Does the subcontractor’s limit and run-off period match the exposure?
Are specialist activities declared to your insurer?

A certificate from a subcontractor is not a substitute for checking the scope, insurer, dates, limit and contractual allocation of responsibility.

PI compared with public liability and cyber insurance

Cover	Main type of allegation	Typical example
Professional indemnity	Financial loss caused by professional services, advice, design or error	A consultant’s incorrect specification causes a client to incur redesign and delay costs
Public liability	Injury or physical property damage connected with business activities	A visitor trips over equipment at the business premises
Cyber insurance	Digital incidents, privacy events, cybercrime and interruption, subject to wording	A ransomware incident prevents access to systems and exposes personal data

The boundaries can overlap. A software implementation failure may involve professional services, cyber events, contractual loss and data issues. The correct response depends on the allegations and policy wording, not just the label given to the incident.

Buying or renewing PI insurance

A structured review should cover:

Business activities: every service actually performed, including new or occasional work.
Clients: sectors, locations, size, dependency and highest-value relationships.
Contracts: indemnities, liability caps, insurance clauses and governing law.
Past work: start date, acquired practices, discontinued services and run-off exposure.
Claims and circumstances: complaints, errors, disputes, fee withholding and threatened claims.
People: employees, consultants, subcontractors and responsible principals.
Limits and excess: any-one-claim or aggregate structure, sublimits and defence-cost treatment.
Territory and jurisdiction: where work is performed and where claims may be brought.
Exclusions: occupation-specific and project-specific restrictions.
Notification: insurer contacts, deadlines and consent requirements.

Use the Business Insurance Review Checklist and Understanding Business Insurance Documents to organise this information.

The duty of fair presentation

For non-consumer insurance, the Insurance Act 2015 requires the insured to make a fair presentation of the risk before the contract is entered into and when relevant variations are agreed.

The presentation must disclose material circumstances known or that ought to be known, or provide sufficient information to put a prudent insurer on notice to ask further questions. Information must be reasonably clear and accessible, material factual representations substantially correct, and matters of expectation or belief made in good faith.

For PI insurance, potentially material matters may include:

the complete range of professional services;
work in higher-risk sectors;
unusually large contracts or liabilities;
overseas work or clients;
complaints, errors, disputes or circumstances;
previous claims;
changes in ownership or legal entity;
use of subcontractors;
sanctions, cladding, asbestos, tax, financial-services or other restricted exposures;
work performed before the requested retroactive date.

Do not bury significant information in an unstructured data dump. A reasonable search may be needed across senior management, project teams and those responsible for insurance.

If something goes wrong

If a client complains or an error is discovered:

read the notification clause immediately;
preserve contracts, emails, working papers and version histories;
avoid admissions, settlements or corrective expenditure without checking consent requirements;
notify the broker or insurer through the stated route;
describe the facts accurately without speculation;
keep a record of dates, communications and steps taken;
continue reasonable loss-mitigation and service-continuity measures where safe and permitted.

A circumstance may need notification before a formal claim exists. Waiting for a letter before action can be too late under some wordings.

The examples in Professional Indemnity Claim Scenarios and Examples show how allegations may develop.

How a PI claim is assessed

A professional-indemnity notification usually involves two separate questions: does the policy respond? and is the insured legally liable? They are related but not identical.

The insurer may first reserve its position while it investigates matters such as:

whether the person or entity facing the allegation is an insured;
whether the work falls within the declared professional services;
when the claim was first made;
when the insured first became aware of the facts;
whether the retroactive date includes the work;
whether the notification complied with the policy;
whether a prior-known-matters or other exclusion applies;
which limit, excess and costs provisions are relevant.

The liability investigation may then consider duty, breach, causation, loss, contractual terms, limitation, mitigation and evidence. The insurer may appoint solicitors or experts and may control settlement discussions.

A coverage reservation is not necessarily a rejection. It records issues that need investigation. The insured should respond accurately, preserve evidence and obtain advice where necessary.

The documents that define the cover

A PI arrangement is normally spread across several documents. The certificate alone is not enough.

Check the following together:

proposal or statement of fact: the information on which the insurer priced and accepted the risk;
schedule: insured names, activities, limit, excess, period, retroactive date, territory and endorsements;
policy wording: the insuring clause, definitions, exclusions, conditions and claims procedure;
endorsements: changes that add, remove or restrict cover;
renewal documents: updated information and any changed terms;
professional-body evidence: where a regulated scheme imposes minimum requirements;
certificates: evidence of selected details for clients or regulators, not the complete contract.

The business insurance documents guide explains the role of each document.

Continuity at renewal

Renewal is especially important for claims-made insurance. A gap, changed retroactive date or narrowed activity description can affect past work.

Before renewal:

Review complaints, errors and circumstances across the business.
Confirm that all current and discontinued services are described correctly.
Check whether major contracts or overseas work have changed the exposure.
Compare the proposed retroactive date with the expiring policy.
Read new exclusions and endorsements rather than assuming continuity.
Confirm that the new insurer accepts prior notifications and that later related claims remain attached correctly.
Keep the expiring wording, schedule and evidence of notification permanently with the relevant records.

Changing broker or insurer does not remove the need to disclose circumstances. Do not delay notification in the hope that a new policy will provide a cleaner position.

Choosing how to buy PI insurance

PI may be available directly online, through a general broker, through a specialist broker or through a professional scheme. The appropriate route depends on the complexity of the risk.

A straightforward low-limit consultancy may be capable of online quotation. Specialist help may be more appropriate where the business has:

regulatory minimum wording;
construction or safety-critical work;
high limits or large contracts;
claims, complaints or notifications;
overseas or US exposure;
acquisitions, mergers or previous practices;
complex subcontracting;
unusual contractual indemnities;
several professional disciplines;
difficulty obtaining renewal terms.

The person arranging insurance should understand whether the service is advised or non-advised, which insurers have been approached and what information has been supplied. Keep a copy of the final submission.

Questions to ask when comparing PI policies

A useful comparison goes beyond premium and headline limit:

Are all current services and trading entities covered?
Is the limit any one claim or aggregate?
Are defence costs inside or outside the limit?
What are the largest sublimits?
What is the retroactive date?
How are related claims aggregated?
Does the excess apply to defence costs?
Are subcontractors and vicarious liability covered?
What territorial and jurisdictional restrictions apply?
Are intellectual property, confidentiality, documents and mitigation included?
Which activities or sectors are excluded?
What is the claims-notification test?
What run-off arrangements are available?
Does the policy meet every regulator, professional-body and client-contract requirement?

A policy can be cheaper because it is narrower. That may be appropriate, but the difference should be understood before purchase.

When to review PI cover during the year

Do not wait automatically for renewal if the risk changes. A mid-term discussion may be needed when the business starts a new service, signs an unusually large contract, enters a new country, acquires another practice, changes legal entity, accepts broader liability, appoints a new subcontractor, becomes subject to a professional rule or discovers an error or complaint.

The policy may require notice of material changes or circumstances. Even where immediate notice is not expressly required, early review can prevent the schedule and actual work from drifting apart. Record the information supplied and any insurer agreement or endorsement.

Cost of PI insurance

There is no dependable single “average” premium for all UK professions. Pricing depends heavily on occupation, revenue, limits, excess, past work, clients, claims history and the wording sought.

Selected providers currently advertise lower-end or starting figures around £6 to £8 a month for some risks, but these figures use different samples and conditions and should not be treated as a market average. Many firms—especially regulated practices, construction professionals, higher-limit buyers and businesses with claims or complex contracts—may pay substantially more.

Read Average Cost of Professional Indemnity Insurance in the UK for the dated evidence and pricing factors.

Frequently asked questions

Is professional indemnity insurance legally required?

Not for every UK business. It can be compulsory under professional or regulatory rules, required by a client contract, or chosen voluntarily. Always identify the source of the requirement.

Does PI cover poor work?

It may respond to a third-party allegation that professional work caused covered loss, but it does not automatically pay the cost of improving or redoing work. The allegation, liability, loss, exclusions and policy terms must be assessed.

Does it cover work done before the policy started?

Only if the retroactive-cover provisions allow it. A retroactive date can exclude earlier work.

Does it cover an allegation even if I did nothing wrong?

Defence costs may be covered for a claim within scope, subject to the wording, excess, limit and insurer control. An allegation alone does not guarantee cover.

Is PI the same as errors and omissions insurance?

The terms are often used for similar professional-liability cover. The contract wording is more important than the label.

Can a client require PI insurance?

Yes. Contracts, tenders and frameworks frequently require a stated limit, period of cover and evidence. Check whether the requested terms match the policy.

Can I cancel PI insurance when I stop trading?

Stopping trading does not remove exposure from past work. Claims-made policies may require run-off cover.

Is the cheapest quote enough?

Price alone does not show whether the activities, limits, retroactive date, exclusions, defence costs and notification provisions fit the risk.

Practical next step

Map the services you provide, the contracts you sign, the highest plausible client loss, previous work and any professional rules. Then compare those facts with the schedule and full wording—not only the headline limit or certificate.