Reviewed by Matthew Bartlett, Director · Last reviewed 8 July 2026
The honest answer to "how much does professional indemnity insurance cost in the UK?" is that it depends on more moving parts than any single figure can capture. Two firms in the same profession, on the same fee income, in the same city, can pay very different premiums — because claims history, scope of work, the limit chosen and insurer appetite all sit inside the price. This page sets out the drivers so you can read a quote and understand what you are being charged for, rather than looking at a headline number in isolation.
Professional indemnity is a bespoke, underwritten product. Unlike a standardised motor policy, each proposal is priced from a fresh submission that runs through an insurer's underwriting model and, for larger risks, a human underwriter's judgement. The insurer is asking: what work does this firm do, for whom, using what documents, with what safeguards, and what does its claims record say about how those risks have played out over time. Every one of those questions has a rating factor attached to it.
That is why quoted premiums for the same firm can differ by a wide margin across insurers, and why the placing job is not simply to send the submission out to as many markets as possible but to send it to the markets whose appetite matches the risk. A poorly matched submission produces poorly matched pricing.
Every UK PI insurer looks at broadly the same building blocks, even if they weight them differently.
Fee income or turnover. The rated exposure base for most professions. ICAEW-regulated accountants, for example, size cover on a 2.5× gross fee income formula that most insurers echo in their pricing. RICS-regulated surveyors are placed within turnover bands set by the Rules of Conduct. Higher fee income usually means higher exposure, and premiums scale with it — but not linearly.
The profession itself and the work carried out. A conveyancing-heavy solicitors' firm is priced differently to a criminal-defence practice. An engineering consultancy signing off structural calculations on high-rise residential work sits in a different underwriting universe to one designing retail fit-outs. The Building Safety Act 2022, section 135, has widened the retrospective limitation period for defective residential work to 30 years, and that has fed directly into premiums for firms with any high-rise or higher-risk building exposure.
Limit of indemnity. The amount the policy will pay out for a single claim or in aggregate across the year. Statutory minimums vary. SRA-regulated solicitors sit on the £2m Minimum Terms and Conditions, £3m for incorporated practices. ARB-registered architects follow Standard 8, which requires adequate and appropriate cover rather than a fixed minimum. Financial advisers work to the FCA's prescribed minimums. Above those floors, the limit is a commercial choice tied to the firm's largest realistic claim.
Excess or self-insured retention. The amount the firm pays before the policy responds. A higher excess usually lowers premium but transfers more of the everyday risk back onto the firm's balance sheet.
Claims history. Insurers ask for at least five, and sometimes six, years of claims and circumstances data. A firm with a clean record is priced differently to one with even a single significant matter reserved above six figures.
Insurer appetite and market conditions. The PI market moves in cycles. A hard market — reduced capacity, insurers exiting classes — pushes rates up regardless of any individual firm's own record. A softer market has the opposite effect. Both cycles come and go.
You will see articles online quoting figures such as "PI insurance typically costs £X for a small firm". Those numbers are usually drawn from a narrow slice of the market, quoted several years ago, and stripped of the context that actually determined the price. A one-person consultancy in a low-hazard sector on a £1m limit will pay a very different premium to a five-partner law firm carrying £3m on the SRA MTC, and the ratio between them is not a fixed multiple.
The more useful way to think about cost is proportionally. Many UK professional firms find their PI premium settles somewhere between a modest fraction of a percent and a few percent of their gross fee income, once claims record and sector are factored in. Some sit outside that band in either direction. What matters is whether your submission is being read by insurers whose model actually fits your work — because that is where the pricing signal comes from.
Under the Insurance Act 2015, section 3, a commercial buyer owes a duty of fair presentation of the risk. That means disclosing every material circumstance the insurer would need to see, or giving enough information to put a prudent insurer on notice to ask. A submission that leaves out awkward facts may produce a lower headline premium but exposes the firm to the remedies in the Act if a claim later reveals the omission — from proportionate reduction of the payout through to avoidance of the policy.
A carefully drafted submission is not just a compliance exercise. It is how the insurer sees the firm at its best — the safeguards, the peer-review process, the sector focus, the reason a matter was reserved and how it was resolved. Those are the details that move premiums in the right direction.
PI is written on a claims-made basis, which means the policy in force when the claim is notified is the one that responds — not the policy in force when the work was done. Two things follow. First, the retroactive date on the policy matters: cover for older work depends on it remaining unbroken. Second, when a firm stops trading, run-off cover has to bridge the gap to the end of the notification window, which for solicitors is six years under the SRA MTC and for other professions varies with regulator and contract. Those choices sit inside the cost picture.
Apex Insurance Brokers is a professions-focused PI broker. We keep pricing tight not by pretending to reach every insurer — no broker does — but by placing submissions with the markets whose appetite fits the work. A named broker handles your file from first enquiry through renewal, and 95% of our clients stay with us year on year. That retention is the honest test of whether the placing keeps working.
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority. Firm reference number 724952.
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