£1m vs £2m vs £5m professional indemnity: which limit do you need?

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

Deciding between a £1 million, £2 million or £5 million professional indemnity (PI) limit is not a question about price — it is a question about exposure. The limit is the maximum your insurer will pay for a covered claim in a period. Pick it too low and you carry the shortfall yourself; pick it without reason and you may pay for cover you were never contractually required to hold. This guide explains how to size the limit correctly using three practical anchors: your real-world exposure, your client contracts, and any regulator that governs your profession.

The limit is a fact about risk, not a menu of prices

PI responds when a client alleges your professional service caused them a financial loss — negligent advice, a design error, a missed deadline, a flawed report. The £1m/£2m/£5m figure is the ceiling on what the policy pays, usually including defence costs unless your wording states costs are payable in addition. So the right question is not “what can I afford?” It is: if my work went badly wrong for the biggest client I serve, how large could their claim realistically be?

That figure is rarely your fee. A £4,000 report can underpin a £600,000 lending or investment decision. The exposure follows the consequences of the mistake, not the invoice for the work.

Anchor 1: Size the limit to your worst realistic loss

Work through your engagements and ask what a single serious error could cost the client. Useful prompts:

• Contract value and project value. Not your fee — the value of the thing your advice affects (the build, the transaction, the system).
• Knock-on losses. Could an error cause delay costs, rectification, or lost revenue far larger than the project itself?
• Number of clients affected. A systemic error in a template, model or piece of software can trigger several claims at once against the same limit.
• Defence costs. Even a claim you successfully defend consumes legal spend. If your policy pays costs within the limit, a defended claim still erodes what is left.

As a rough guide only: £1m tends to suit sole traders and small firms on low-value, low-consequence work; £2m fits growing consultancies and mid-sized contracts; £5m is typical where a single engagement could plausibly produce a seven-figure loss.

Anchor 2: Read what your contracts demand

Many clients set the limit for you. Public-sector frameworks, large corporates and main contractors routinely specify a minimum PI limit as a condition of appointment — often £2m or £5m, sometimes “per claim” rather than in the aggregate. Two contract details decide whether your cover actually qualifies:

• Per claim vs aggregate. “£2m in the aggregate” is the total for the whole policy year across all claims. “£2m each and every claim” restores the full limit for each separate claim. A contract asking for £2m each and every claim is not satisfied by a £2m aggregate policy.
• Duration. PI is written on a claims-made basis, so the contract may require you to maintain the limit for a set number of years after the work completes. Losing the cover early can breach the contract.

Tell us what your contracts require and we will make sure the limit and basis match before you sign.

Anchor 3: Check your regulator’s minimum

Several UK professions have a mandatory minimum PI limit set by their regulator or professional body. If that applies to you, it is a floor you cannot go below — and your commercial exposure may still justify going higher. Examples of bodies that set PI requirements for their members include:

• The Solicitors Regulation Authority (SRA), whose Minimum Terms and Conditions set required cover for solicitors’ firms.
• The Financial Conduct Authority (FCA), which sets PI requirements for the firms it authorises.
• Professional bodies such as ICAEW (chartered accountants), RICS (surveyors) and ARB/RIBA (architects), which set PI rules for members and registrants.

The exact figure and basis vary by body and can change, so confirm the current requirement directly with your regulator or ask us to check it against your permissions before you buy.

£1m vs £2m vs £5m at a glance

What actually moves the cost of a higher limit

Moving from £1m to £2m to £5m does not increase your premium in a straight line, and the limit is only one factor. What insurers weigh includes:

• Your profession and activities — the type of advice and how much clients rely on it.
• Fee income and client mix — scale and the size of your largest engagements.
• Claims history — past claims and how they were handled.
• Excess and policy basis — a higher excess or aggregate basis changes the price.
• Contract terms you accept — onerous liability clauses can raise the risk an insurer sees.

A broker’s job is to right-size the limit and present your firm well to the market, so you are not paying for cover you do not need — or discovering a shortfall after a claim.

Common questions

Should the limit match my annual turnover?

No. Turnover is a useful sizing input, but PI exposure follows the potential loss to your client, which can be many times your fee or turnover. Size the limit to the worst realistic claim, then check it against contracts and any regulator minimum.

What is the difference between “per claim” and “aggregate”?

“Each and every claim” restores the full limit for every separate claim in the year. “In the aggregate” is a single total shared across all claims that year. Contracts often specify which they require, so read the wording before you buy.

Can I increase my limit mid-term if a big contract comes in?

Usually yes. Speak to your broker before you sign the contract so the limit and basis are in place from the start of the engagement rather than after work has begun.

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.