Anyone shopping for professional indemnity cover quickly discovers that a straight answer to the question ‘how much does it cost?’ is harder to pin down than it looks. There is a good reason for that. PI is priced by underwriters against a matrix of risk factors that vary firm by firm, year by year, and market by market. Regulatory principles reinforce the point: under COBS 4.2.1R the FCA requires financial promotions to be fair, clear and not misleading, which means a broker cannot responsibly publish headline numbers that most readers would not actually be quoted. What Apex Insurance Brokers can do is set out the drivers that determine where a premium lands, so a firm approaching renewal or first-time purchase understands what is being weighed.
Six factors do most of the work in a PI rating exercise. They are the profession or activity being insured, the firm’s gross fee income, the claims and circumstance history, the limit of indemnity chosen, the retention (deductible) accepted, and the state of the wider insurance market at the point of placement. Each of these interacts with the others, and the interaction is rarely linear.
Different professions attract materially different rates per £1 of income. As a broad order of magnitude, solicitors, insolvency practitioners and construction consultants tend to sit at the higher end of the scale, reflecting the frequency and severity of claims the market has seen in those disciplines. Accountants, financial advisers and surveyors sit in a middle band, again reflecting claims experience and the compulsory minimum limits their regulators require. IT consultants, management consultants and marketing professionals typically sit at the lower end, though the range within that group is wide and depends heavily on the nature of the work — a consultant advising on safety-critical systems is priced very differently from one advising on brand strategy. Explore the profession pages for context: solicitors, architects, accountants, financial advisers and IT consultants.
Income is the primary exposure measure. Underwriters use it as a proxy for how much work has been done and therefore how much could, in principle, give rise to a claim. Rating is not perfectly linear — a firm with double the income does not necessarily pay double the premium — but the direction of travel is clear. Firms that grow quickly, or that step into new service lines, should expect a fresh underwriting review rather than a proportional adjustment on last year’s number.
Nothing moves a PI premium faster than the claims record. A clean five-year experience tends to attract credit; a recent notified circumstance, even without a paid loss, will draw scrutiny; a paid claim will typically push pricing materially higher and may narrow the field of insurers willing to quote at all. Firms should notify circumstances properly and promptly under the terms of the policy — failing to do so can prejudice cover and, when discovered later, is far more damaging to renewal than the original event.
The limit chosen is a significant driver but the cost of buying additional limit is not proportional. Doubling a limit from £1m to £2m does not double the premium; the incremental cost of each layer typically reduces as the limit rises, because the probability of a claim reaching the higher layers falls. That said, firms should not choose a limit purely on price. Regulatory minimums (where they apply), contractual requirements from clients, and the realistic worst-case exposure of the work all bear on the decision.
A higher retention — the amount the firm carries itself before the policy responds — will generally reduce premium, sometimes materially. It also increases the firm’s balance-sheet exposure on any single matter, so the trade-off needs to be sized against cash reserves and the volume of small claims a firm typically sees. The market cycle sits over everything: in a hardening market rates rise across the board and capacity contracts; in a softening market insurers compete more openly on price and terms. See the PI market cycle explainer for how this affects renewal planning.
Consider two solicitors’ firms of comparable size, both buying the same limit, the same retention and the same broad scope of cover. Firm A has five clean years with no notifications. Firm B notified a matter last year that settled for £180,000. Assuming everything else is equal, Firm A’s premium will be materially lower than Firm B’s — not because the underlying work is inherently different, but because the underwriting judgment about future claims frequency and severity has been reset by the paid loss. Renewal history, the state of the market at renewal, and firm-specific factors such as risk-management improvements all compound on top. The role of the broker is to secure the best available terms given the firm’s profile, and to present the risk in a way that reflects fair presentation under the Insurance Act 2015.
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority. Firm reference number 724952. This entry is general information, not advice on any particular policy.