Summary

Most tradespeople confuse professional indemnity with public liability. They are distinct coverages for different types of risk. PL covers injury and damage caused by physical actions on site. PI covers the financial loss a client suffers as a result of your professional advice, design, or certification being wrong — even if no physical damage occurs.

Consider a gas engineer who advises a client that their existing boiler flue route is suitable for a new appliance. If that advice turns out to be wrong and the client suffers loss as a result (remedial work to reposition the flue), PI insurance would respond, not PL. Or consider an electrician who issues an EICR certificate and subsequently misses a fault that later causes a fire. The certification error is a PI claim; the fire damage itself may give rise to a separate PL claim.

For most trade work carried out to physical plans and specifications drawn up by others, PI is not required. It becomes relevant when you design, advise, certify, or specify — activities that carry a duty of care independent of the physical workmanship itself.

Key Facts

  • PI covers — professional advice, design errors, specification mistakes, certification errors, breach of professional duty
  • PI does NOT cover — physical damage or injury from work on site (covered by PL), deliberate acts, criminal conduct
  • Who typically needs PI — electricians issuing EICRs, gas engineers issuing Gas Safety records, structural engineers, building surveyors, architects, drainage designers, design-and-build contractors
  • Who rarely needs PI — pure installation tradespeople working to others' designs (plasterers, painters, ground workers, labourers)
  • Minimum levels — no universal minimum; typically £250,000–£1 million for sole traders; £1m–£5m for design-and-build firms
  • Retroactive cover — PI policies are typically claims-made; you must have cover in force when the claim is made, not just when the work was done
  • Run-off cover — essential when ceasing to trade; covers claims made after you stop trading for advice given while trading
  • Excess — typically £1,000–£5,000 on PI policies for tradespeople; higher than PL
  • Aggregated or per-claim limit — check whether your limit is per claim or aggregate; aggregate limits can be exhausted by multiple small claims
  • Common exclusions — known or deliberate errors, fraud, criminal acts, work outside the policy's defined activities

Quick Reference Table

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Trade / Activity PI Recommended? Notes
Gas Safe engineer — installation only Not typically required Work certified under Gas Safe scheme; PL is primary cover
Gas Safe engineer — issuing Gas Safety Records Recommended Certification error could cause client loss
NICEIC/NAPIT electrician — installation only Not typically required Work certified under competent person scheme
Electrician issuing EICR certificates Recommended EICR certification is a professional opinion; errors are PI risk
Plumber — domestic installations only Not typically required PL is primary cover
Plumber — designing drainage systems Recommended Design advice creates professional duty
Structural engineer Required Core professional activity is design and advice
Architect Required Legally required for ARB-registered architects
Design-and-build contractor Recommended Design element creates PI exposure
Builder — working to plans by others Not typically required No design role; PL is primary cover
Energy assessor / SAP assessor Required EPC certification is a professional opinion
Party wall surveyor Required Award-issuing function creates professional liability

Detailed Guidance

Understanding the Claims-Made Basis

Unlike PL insurance (which is typically occurrence-based), PI insurance is almost always written on a claims-made basis. This has important implications:

Occurrence-based (typical PL): Covers incidents that occur during the policy period, regardless of when the claim is made. If you had PL cover in 2020 when the incident happened, you can claim even if the policy has since lapsed.

Claims-made (typical PI): Covers claims made during the policy period, regardless of when the advice was given. If you had PI cover in 2024 when you gave the advice but the claim is made in 2026 when your policy has lapsed, you are NOT covered.

Consequence: You must maintain PI cover for as long as clients might bring claims against you — potentially 6 years after each piece of advice (the standard limitation period). When you retire or close the business, you need "run-off cover" — a policy that continues to respond to claims made after you stop trading.

Run-off cover typically costs 100–200% of the last annual premium for a 3–6 year period. Factor this into the cost of any business exit.

What Triggers a PI Claim?

A PI claim typically arises when:

  1. You owe a duty of care to the claimant (established by your role, certification, or specific advice)
  2. You breach that duty (error, omission, or negligent advice)
  3. The claimant suffers a quantifiable financial loss as a result
  4. The loss is foreseeable as a consequence of your breach

Example — electrician EICR: An electrician issues an EICR marking an installation as satisfactory. Three months later, a fault (which an EICR should have identified) causes a fire. The insurer of the damaged property sues the electrician for the cost of the claim, arguing the EICR was negligently issued. This is a PI claim.

Example — plumber's design advice: A plumber recommends a specific pipe routing for a new heating system. The routing, unknown to the plumber, causes hydraulic noise issues in the property. The customer claims the advice was negligent and seeks the cost of rerouting. This is a PI claim.

How Much PI Insurance Do I Need?

There is no statutory minimum for most trades (unlike EL). Consider:

  • What is the largest loss a client could suffer as a result of your advice? For a sole trader advising on a domestic installation, this is typically limited — perhaps £50,000–£100,000 at most. For a structural engineer advising on a large commercial project, it could be millions.
  • What does your professional body require? ARB-registered architects must hold PI. RICS members must hold PI. Some competent person schemes may recommend or require it.
  • What do your clients or contracts require? Commercial clients may specify PI levels in their procurement requirements.
  • Claims management costs — defending even a spurious PI claim can cost £5,000–£50,000 in legal fees. Your cover limit should be above your expected loss, not just your expected settlement.

Typical starting levels for sole trader tradespeople with PI exposure: £250,000–£500,000 per claim. For design-and-build contractors working on larger projects: £1m–£2m.

Getting PI Insurance

PI insurance for tradespeople is available from specialist trade insurers and through trade association group schemes. When applying, you will typically be asked:

  • The nature and description of professional services you provide
  • Your annual fee income from those services
  • Your history of claims or circumstances that could give rise to claims
  • Your professional qualifications and registrations

Fair presentation: The Insurance Act 2015 requires you to make a "fair presentation of risk" — disclose all material facts, including any known issues or potential claims, even if they have not yet been raised by a client. Non-disclosure can void the policy.

PI and Domestic Reverse Charge VAT

Unrelated to the content of PI policies, but worth noting: if you are both providing a design service and carrying out the construction work as part of the same contract, the domestic reverse charge may apply to the construction element. The design element may be separate — take advice from an accountant on how to structure invoices if you provide design-and-build services.

Frequently Asked Questions

I'm an electrician and my NICEIC membership includes professional indemnity. Do I need separate PI?

Check the exact terms of any NICEIC-included cover carefully. Some trade body schemes include a degree of PI protection, but the limits may be lower than appropriate for your work and the terms may be more restrictive than a standalone policy. Read the schedule and exclusions before assuming you are covered.

Does PI cover me if a client makes a complaint to my trade body?

No — PI covers financial loss claims. A trade body investigation or disciplinary process is not covered by PI. However, if the trade body investigation leads to a civil claim for financial loss, the subsequent claim may be covered. Some insurers offer legal expenses insurance as an add-on, which can help with the costs of responding to regulatory investigations.

I gave verbal advice on site that turned out to be wrong. Am I covered?

Verbal advice can create professional duty. If your PI policy covers your professional activities and you gave advice in the course of those activities, you should be covered regardless of whether the advice was written or verbal. However, the difficulty with verbal advice is evidence — it becomes your word against the client's. This is one reason professional advice should be confirmed in writing.

How long after completing a project could a PI claim arise?

The Limitation Act 1980 allows civil claims to be brought within 6 years of the breach of duty (or from when the claimant became aware of the damage, in cases of latent defects). For construction defects, this can mean claims arising up to 6 years after completion, or in rare cases involving latent structural defects, even longer under the "date of knowledge" extension. This is precisely why run-off cover after retirement or closure is essential.

Can I get PI insurance if I have a previous claim or potential claim?

Yes, but you must disclose it. You must fully disclose any known claims or circumstances that could give rise to a claim when applying for PI. Failure to disclose is likely to make the policy voidable. Some insurers will not cover you, or will apply an exclusion for the known situation, but you cannot conceal it. Brokers specialising in "impaired risk" PI can often find cover where mainstream insurers decline.

Regulations & Standards

  • Architects Act 1997 — ARB registered architects are required to maintain PI insurance

  • Insurance Act 2015 — fair presentation of risk; material disclosure requirements

  • Limitation Act 1980 — 6-year limitation period for professional negligence claims

  • Health and Safety at Work etc. Act 1974 — duty of care that underpins many professional liability claims

  • Gas Safety (Installation and Use) Regulations 1998 — gas engineer responsibilities that could give rise to PI claims

  • BS 7671 — IET Wiring Regulations; standard against which electrical certification work is judged

  • BIBA — Finding specialist PI insurance — British Insurance Brokers' Association broker finder

  • RICS — PI requirements for members — Professional body guidance on minimum PI levels

  • ARB — Professional indemnity for architects — Architects Registration Board requirements

  • Association of British Insurers — PI explained — Industry overview of professional indemnity insurance

  • public liability — Public liability insurance covering physical damage and injury

  • tool insurance — Tool and equipment cover

  • competent person — Competent person schemes and their certification activities

  • building control — When certification activities trigger building control involvement