Professional Indemnity Insurance for Larger Professional Firms

Reviewed by Apex Insurance Brokers · Last reviewed 2026-08-10

There is a point in the life of every professional practice at which professional indemnity insurance stops being a purchase and becomes a piece of financial engineering. For a three-partner firm with a local client base, a packaged policy rated on a turnover band is usually the right answer. For a practice with several offices, eight-figure fee income, institutional clients and a live claims history, it is almost never the right answer — and continuing to buy that way tends to cost more and cover less. This page sets out how PI programmes are designed for firms at the larger end, and what the market will expect from you in return.

When has a firm outgrown the packaged PI market?

Packaged and scheme PI products exist because small, homogeneous risks can be rated by formula: turnover, profession, claims-free years. The wording is standardised, the underwriting is largely automated, and the economics work because no individual risk justifies bespoke attention. The model breaks down once the firm stops looking like the portfolio it is rated against.

The usual signals are familiar to anyone who has sat on a management board: fee income beyond the upper bands of scheme appetite; a merger or lateral hires bringing in a different risk profile; single engagements whose values dwarf the firm’s historic norm; clients contractually demanding limits the packaged market will not offer; overseas work or overseas clients; and a claims record with enough activity that a tick-box proposal form cannot tell the story fairly. At that point the rating basis needs to shift from formula to judgement — an underwriter assessing your firm, on your data, against a wording you have had a hand in shaping. Firms that stay in the packaged channel past this point are typically subsidising smaller risks, and are exposed to standard-form exclusions that were never drafted with their work in mind.

Should the limit sit with one insurer or be layered?

Above a certain limit, single-carrier placement stops being practical: few insurers will deploy their full appetite on one risk, and fewer still should be asked to. The standard architecture is a layered programme — a primary layer that carries the operative wording and the claims-handling relationship, with one or more excess layers sitting above it, often with different insurers on each layer.

Layering does three useful things. It assembles more capacity than any one insurer would grant. It creates competitive tension layer by layer, because insurers can be moved or re-ordered at renewal without disturbing the whole tower. And it diversifies counterparty exposure, which matters when a limit is intended to respond over many years of discovery.

The technical care sits in how the layers connect. Excess layers are typically written “follow form” — adopting the primary wording — but almost always with their own conditions, and the differences are where programmes fail. The points to interrogate include how claims aggregate across layers, whether defence costs are payable in addition to or within the limit at each level, how and when an excess layer treats the primary as exhausted, and whether the limit operates on an any-one-claim or aggregate basis — a distinction whose consequences grow with the size of the tower, and which we examine in detail in any one claim vs aggregate PI. For law firms there is a further structural given: the SRA’s minimum terms apply to the compulsory primary layer (£2m any one claim, or £3m for recognised and licensed bodies), while everything above it is freely negotiated commercial cover — so the top-up layers are precisely where broking judgement earns its keep. The mechanics of building those upper layers are covered in our page on excess layer PI insurance.

Should we carry a self-insured retention rather than a standard excess?

Smaller firms carry an excess: the insurer generally handles the claim from the ground up and looks to the insured for its contribution. Larger firms increasingly carry a self-insured retention, which is a different animal. Within an SIR the firm funds — and in many structures manages — claims itself; the insurer’s obligations attach only once the retention is eroded.

Done well, a meaningful retention removes attritional claims from the insured record, which over time is one of the more effective levers on programme cost; it buys premium credit; and it keeps the handling of small, sensitive matters — the fee dispute dressed up as a negligence allegation, the complaint from a long-standing client — inside the firm rather than in an insurer’s claims queue. Done casually, it converts an insurance problem into a balance-sheet problem.

The questions to resolve before taking a large retention: can the firm fund several retentions falling in the same financial year, and is an annual aggregate cap on retained losses available to bound that exposure? Do defence costs erode the retention, or only indemnity payments? Does the firm actually have the internal capability — a general counsel or claims partner, reserving discipline, records that would survive insurer audit — to run claims within the retention? And in the regulated professions, how does the compulsory layer constrain the structure? For solicitors, the minimum terms are drafted to protect claimants, so the insurer typically cannot decline to pay a claim merely because the firm has failed to fund its excess; the practical effect is that large retentions for law firms need careful structuring around the compulsory layer rather than within it.

What claims-handling protocols should we negotiate up front?

At this end of the market the claims relationship is negotiated before the first claim, not discovered during it. A firm with a substantial programme should expect its broker to agree, in the wording or by side protocol, how claims will actually run.

Notification is the first pressure point. Standard wordings often deem the firm to know what any employee knows; larger firms typically negotiate provisions that key notification obligations to the knowledge of designated individuals — senior partners, the general counsel, the COLP in a law firm — so that a matter sitting unrecognised in a regional office does not silently prejudice cover. Alongside this sits an agreed practice for notifying circumstances: at scale, a disciplined, well-presented block notification at year end is a very different underwriting message from a scatter of late, defensive ones.

Control of defence comes next. Many wordings give the insurer conduct of the claim and choice of lawyers; firms with reputations to protect negotiate panel arrangements they have approved, or the right to appoint their own defence counsel with insurer consent not to be unreasonably withheld. Settlement mechanics matter equally: many wordings contain some form of dispute mechanism where insured and insurer disagree about contesting a claim, and the detail of that clause deserves reading before it is needed. Finally, the routine machinery — quarterly claims review meetings, agreed reserving communication, mitigation costs cover for correcting an error before it becomes a claim (available in some wordings, absent in others) — is what makes a programme feel like a relationship rather than a policy.

What data will underwriters expect before quoting?

Formula-rated business is priced on the portfolio; large firms are priced on themselves. That transfers the burden of proof to the firm, and the quality of the submission moves the outcome. The core pack a broker should be assembling with you includes:

• Claims triangulations — the development of each notification year over time: amounts paid, current reserves, matters closed. Underwriters read triangulations for reserving discipline and deterioration patterns, not just totals.
• Fee income splits — by discipline, work type, client sector and jurisdiction, over several years, so the underwriter can see where the exposure actually sits and how it is trending.
• Concentration data — largest clients as a percentage of fees, largest single engagements, and any work where the firm’s exposure is disproportionate to its fee.
• Risk management evidence — engagement letter discipline, liability caps where the profession permits them, conflict checking, file review and supervision structures, and how lateral hires are inducted into them.
• Corporate history — mergers, acquired practices and any inherited run-off exposure, with dates and the cover position for each predecessor firm.

The narrative matters as much as the numbers. A claims record is rarely self-explanatory: a large reserve may be precautionary, a cluster of notifications may trace to a single departed partner, a deteriorated year may reflect one aberrant engagement. A submission that explains its own data — candidly, before the underwriter asks — is the single cheapest improvement most large firms can make to their programme.

Why are larger firms placed in a different part of the market?

Because the product is different. Packaged business is distributed through schemes and portals against fixed wordings. Larger risks are placed in the open market — for the largest firms, often on a subscription basis with several insurers each taking a share — with underwriters who have the authority to negotiate terms line by line. That is what makes everything above possible: manuscript amendments to notification and knowledge provisions, negotiated retention structures, agreed claims protocols, and endorsements shaped to the firm’s actual work rather than a standard trade description.

It also changes the tempo. Open-market placement rewards continuity and relationship: underwriters who have met the management team, seen the risk management in operation and watched the claims record develop over several years will typically take a more considered view than a market approached cold. The corollary is that a well-run large-firm programme is a multi-year strategy — which insurers hold which layers, how the tower is re-marketed without destabilising it, how a future merger or an eventual run-off (six years, on prescribed terms, in the solicitors’ profession) would be handled — rather than an annual price check. Choosing a broker with genuine access to this part of the market, and the standing to negotiate in it, is itself a programme decision; we set out what to look for in a high-value PI insurance broker.

What should we be doing differently at renewal?

Start earlier than feels necessary — data assembly for a layered programme sensibly begins a quarter before renewal, and underwriter meetings before terms are sought. Treat the wording review as seriously as the pricing: at this scale, a single aggregation clause is worth more than any plausible premium saving. Revisit the retention against the current balance sheet rather than rolling last year’s figure. And insist that your broker presents the programme back to you as a structure — who sits where, on what terms, with what differences between layers — so the board is approving something it actually understands.

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