PI wording · Layered programmes
PI excess layer programmes — when one insurer will not carry the whole limit
Reviewed by Matthew Bartlett, Director, Apex Insurance Brokers Limited · Published 14 July 2026
Larger professional firms and higher-risk practices often need PI cover that no single insurer will write. The answer is a layered programme: a primary insurer at a defined limit, plus one or more excess insurers stacking above. This page explains how such programmes are built, when they make sense, and where the pitfalls lie.
When a layered programme is needed
- Cover limit exceeds the primary insurer's capacity or appetite for the risk.
- Risk profile requires diversification of insurer counterparty risk (large single-insurer concentration).
- Primary market pricing is unattractive; excess market pricing is competitive above a certain attachment point.
- Regulator floor sits at one level, prudent cover sits above — layer above the floor.
How a layered programme is structured
- Primary layer — the first-loss insurer up to a defined attachment point (typically £1m to £5m for professional firms).
- First excess layer — attaches above primary, up to a further limit.
- Second and higher excess layers — stack above the first excess.
- Excess insurers follow the primary's wording in most cases (‘follow-form’ wordings) — but not always. Read the wordings.
Follow-form pitfall. Excess policies said to ‘follow the primary’ may in fact vary in key definitions, exclusions or notification triggers. Confirm the excess layer actually responds where the primary does.
Attachment points and gaps
- Each excess layer attaches at the exhaustion point of the layer below.
- Any gap between primary limit and excess attachment leaves the firm exposed for that band.
- Any inconsistency in aggregation clauses between layers can produce a ‘pancake’ effect where the layers do not stack cleanly.
- A specialist broker's job is to ensure the programme is contiguous and coherent.
Pricing dynamics
- Primary layer is the most expensive per unit of limit — the insurer bears frequency risk.
- First excess layer is materially cheaper per unit — frequency of losses reaching that attachment is much lower.
- Higher excess layers get progressively cheaper.
- Total programme cost is typically well below the theoretical cost of a single-insurer full-limit policy.
Common structures for professional firms
- Small commercial firm — single primary policy at £1m-£2m aggregate. No excess.
- Mid-market professional firm — primary at £2m-£5m plus first excess to £10m or higher.
- Large solicitors' firm — SRA MTC primary layer plus multiple excess layers up to £25m-£50m.
- Higher-risk architects with BSA exposure — layered programme with long-tail run-off, potentially syndicate-led.
- Discretionary managers or high-value IFAs — primary FCA-compliant plus excess to reflect assets under management.
Watchpoints
- Notification triggers must be consistent across layers — a notification given to primary but not to excess can void excess cover.
- Defence-costs treatment must be consistent — some layers pay costs in addition; others erode limit.
- Aggregation clauses must be consistent — different aggregation across layers creates coverage gaps.
- Reinstatement provisions must be programme-wide, not layer-by-layer.
- Insurer solvency — layered programmes create multiple counterparty-solvency dependencies.
Frequently asked
At what firm size does a layered PI programme become necessary?
There is no fixed threshold. Practically, above £5m-£10m cover limit for professional firms, single-insurer capacity becomes a constraint and layering typically starts. Smaller firms with unusual risk profiles may also layer.
What is a 'follow-form' excess policy?
An excess policy that mirrors the terms of the primary policy above the attachment point. In theory, excess responds where primary responds. In practice, follow-form wordings often have variations that need careful reading.
Does one broker handle the whole programme?
Usually yes. A single specialist broker (like Apex on Lloyd's / wholesale layered programmes) places primary and excess, ensuring wording consistency, notification protocols and renewal coordination.
How does aggregation work across layers?
Ideally consistently. Where the primary aggregation clause treats multiple losses as one, the excess should too. Where they differ, the programme can produce unexpected gaps. Read the wordings side by side.
What happens if a claim exhausts the primary but sits within excess?
The excess insurer takes over defence and payment above the primary's exhaustion point. The transition must be handled cleanly — primary insurer's obligations to hand over information, excess insurer's confirmation of position, ongoing claim management.
Can excess layers be from Lloyd's syndicates and primary from a company insurer?
Yes, and this is common. Company market often carries primary; Lloyd's syndicates carry excess where their appetite sits above a certain attachment. A specialist broker with Lloyd's access is essential for excess layer placement.
Are excess layers cheaper per unit of cover?
Yes materially. Frequency of losses reaching high excess attachments is low, so per-unit pricing drops. Total programme cost is well below the equivalent single-insurer policy.
Does Consumer Duty apply to layered programmes?
Yes — the fair-value assessment under PRIN 2A must consider the total programme cost against the total programme benefit. Documenting the value case for a layered programme is part of Consumer Duty implementation for FCA-authorised distributors.