Is professional indemnity insurance a legal requirement?

Reviewed by Matthew Bartlett, Director, Apex Insurance Brokers Limited · Last reviewed 2026-08-05

Unlike employers' liability insurance — which is a legal duty for most businesses with staff under the Employers' Liability (Compulsory Insurance) Act 1969 — professional indemnity insurance is not imposed on all businesses by a single statute. Whether you must hold it depends on who regulates your work and what you have signed up to. This page explains exactly where PI is compulsory, where it is merely expected, and how to tell which applies to you.

Where PI insurance is genuinely mandatory

For many professions, PI is a condition of being allowed to practise. Your regulator sets a minimum limit of indemnity and can suspend or refuse authorisation if you cannot evidence cover. If you work in a regulated field, treat PI as non-negotiable rather than optional.

Professions where a regulator or professional body requires PI as a condition of practising or membership include:

• Solicitors — the Solicitors Regulation Authority (SRA) requires firms to hold qualifying PI cover meeting its Minimum Terms and Conditions.
• Accountants — bodies such as the ICAEW and ACCA make PI a condition of a practising certificate.
• Financial advisers and other FCA-regulated firms — the Financial Conduct Authority requires PI cover under its prudential rules for many types of authorised firm.
• Architects and surveyors — RIBA and RICS require members and regulated firms to carry adequate PI.
• Insurance and mortgage brokers — PI is required under FCA rules.
• Healthcare professionals — the Health and Care Professions Council (HCPC), the GMC and similar regulators require an appropriate indemnity arrangement, which is often satisfied by PI or professional indemnity from a medical defence organisation.

If any of these describe you, "is PI a legal requirement?" is really "does my regulator require it?" — and the answer is yes. The specific minimum limit varies by regulator, so check your rulebook or ask us.

Where a contract makes PI compulsory

Even when no regulator applies, a client can make PI a contractual requirement. This is common and often overlooked. Public sector frameworks, large corporate clients and main contractors frequently require suppliers to hold a stated level of PI — commonly £1m, £2m or £5m — before work can begin.

Where this happens, the cover is not optional. Failing to hold it, or letting it lapse mid-contract, can put you in breach and expose you to termination or personal liability. Watch for PI clauses in:

• Public sector and local authority tenders and framework agreements.
• Consultancy and professional services agreements with larger clients.
• Subcontracts on construction and engineering projects.
• Software, IT and design supplier contracts.

Contracts sometimes also require you to maintain the cover for a period after the work ends, because PI is written on a "claims made" basis — the policy that responds is the one in force when a claim is notified, not when the work was done.

Mandatory vs optional-but-expected: a quick comparison

Where PI is optional but sensible

Many businesses fall outside both regulation and contractual pressure but still carry real exposure. If clients rely on your advice, designs, specifications or professional judgement, a mistake — or an allegation of one — can lead to a claim for financial loss. PI covers your legal defence costs and any damages you become liable to pay, which is why consultants, coaches, IT professionals and creative agencies routinely buy it even when no rule compels them to.

Winning work can also depend on it. Prospective clients increasingly ask for evidence of PI during due diligence, so holding cover can be the difference between qualifying for a contract and being ruled out. In that sense PI is often commercially required long before it is legally required.

What decides the limit — and the cost

Because the requirement varies, so does the appropriate limit of indemnity. There is no universal figure. What drives both the limit you need and the premium you pay includes:

• Your regulator's or client's minimum — you must at least meet the stated limit; falling short defeats the point.
• The size of contracts you handle — the bigger the potential loss to a client, the higher the limit you should carry.
• Your profession's risk profile — advice-heavy or high-value work attracts higher premiums.
• Your claims history and turnover.
• Retroactive date and run-off needs — cover for past work and for the period after you stop trading.

A broker's job is to translate your regulatory rulebook and contract wording into a policy that actually satisfies them — the right limit, the right basis, and no gaps that could leave you technically non-compliant. Start a quote and tell us what your regulator or contract requires.

Common questions

Is PI insurance required by law for a limited company?
Not automatically. A limited company only needs PI if its regulator requires it or a contract obliges it. Company structure itself doesn't create a legal duty to hold PI — the nature of your work and your obligations do.

What's the difference between PI and public liability insurance?
PI covers financial loss caused by your professional advice, service or negligence. Public liability covers injury or property damage to third parties. Neither is a universal legal requirement, though a regulator or contract can make either compulsory.

What happens if I don't have PI when it's required?
If your regulator requires it, you can be suspended, fined or barred from practising. If a contract requires it, you may be in breach, lose the contract and face personal exposure to any resulting claim.

Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This guide is general information, not advice on a specific policy or a substitute for your policy wording.