Can you buy professional indemnity insurance for a single project?
Reviewed by Matthew Bartlett, Director, Apex Insurance Brokers Limited · Last reviewed 2026-08-05
If you are a consultant, contractor, architect or designer asked to hold professional indemnity (PI) insurance for one job, it is natural to ask whether you can buy cover for just that project rather than committing to a full annual policy. The short answer is that project-specific arrangements exist, but they behave very differently from an annual policy, and misunderstanding the mechanics can leave you exposed long after the work is finished.
Why "claims-made" changes everything
Almost all UK professional indemnity policies are written on a claims-made basis. This is the single most important fact to understand before buying single-project cover.
A claims-made policy responds to claims that are first made against you and reported during the policy period, regardless of when the work was actually carried out. This is different from most other business insurance (such as public liability), which typically works on an "occurrence" basis and responds to when the incident happened.
The practical consequence: if you buy PI for a single project, do the work, and then let the cover lapse when the project ends, you may have no protection if a client alleges negligence six or eighteen months later. Professional claims frequently surface long after a project completes, once a defect emerges or a dispute develops. That timing gap is where single-project buyers most often come unstuck.
What "single-project" PI cover actually looks like
When people ask about one-off cover, they usually mean one of a few different things. It helps to separate them:
| Arrangement | How it works |
|---|---|
| Standalone single-project policy | A dedicated policy covering one named contract, sometimes with a longer reporting period built in. Availability is limited and often for larger construction or design projects. |
| Project-specific extension | A higher limit or specific terms added to your existing annual policy to satisfy one demanding client contract. |
| Short-period annual policy | A conventional annual PI policy taken out to cover the project period, then renewed year after year to keep the "claims-made" chain unbroken. |
For most freelancers and small consultancies, the third option, a normal annual policy that you keep renewing, is what actually delivers the protection they need. A genuinely standalone, one-and-done policy is less common and tends to be arranged for defined construction and engineering projects where the client mandates a specific structure.
Why annual continuity usually matters more
Because of the claims-made mechanism, the value of PI is not just in the year you buy it, it is in keeping cover live continuously so that late claims still land somewhere. Two features make continuity work:
- Retroactive date. An annual policy usually carries a retroactive date, meaning it can respond to claims arising from work done before the current policy year, as long as you have held unbroken cover back to that date. Keep renewing and your past work stays protected.
- Run-off cover. When you finally stop trading or wind down, run-off cover keeps a claims-made policy responding to late claims for a set number of years afterwards. A lapsed single-project policy typically offers nothing equivalent.
This is why buying PI for a single project and then cancelling can be a false economy. You save on one premium but lose the retroactive protection that an ongoing annual policy quietly provides for every past job.
Not sure whether a single-project arrangement or an annual policy fits your contract? We will look at the actual client requirements and the claims-made implications with you.
Get a PI quote →When a project-specific approach does make sense
There are legitimate cases for structuring cover around a project rather than defaulting to a rolling annual policy:
- A one-off contract demands a much higher limit than your usual work justifies, and you do not want to carry that limit all year.
- A client's contract specifies unusual conditions (such as a fixed limit maintained for a defined number of years after completion) that a bespoke project policy can meet more cleanly.
- You are part of a joint venture or a project where cover needs to sit at the project level rather than the individual firm.
In these situations a broker can compare a project extension against a full annual policy and show you where the real protection, and the real cost, sits. For a genuine one-off arrangement, always check how long the policy will keep responding to claims after the work ends.
What drives the cost either way
Whether you arrange single-project or annual PI, the price is shaped by the same core drivers. There is no meaningful "one project = fixed price" figure, because insurers assess risk, not calendar length. The main factors are:
- Limit of indemnity. Common options run at £1m, £2m or £5m. Higher limits, often demanded by larger clients, increase the premium.
- Your profession and the work's risk. Design, structural and financial advice attract more scrutiny than lower-risk consultancy.
- Contract value and exposure. A large, high-value project carries greater potential loss than a small one.
- Retroactive date and claims history. How far back cover reaches and whether you have prior claims.
- Excess. The amount you self-fund per claim affects the premium.
Because a single-project policy often has to build in a longer reporting or run-off period, it will not necessarily be cheaper than an annual policy, even though it covers less time. That is another reason to compare both routes properly before deciding.
Common questions
If my project finishes, can I just cancel the policy?
You can, but because PI is claims-made, cancelling ends your protection for claims reported afterwards. Many professionals instead keep an annual policy running, or arrange run-off cover, so that late claims from completed work are still covered.
Does a single-project policy cover claims that arrive after the project ends?
Only if the policy specifically provides an extended reporting or run-off period. A plain policy that simply lapses at project completion typically will not respond to claims made later. Always confirm this point before buying.
My client only asks for PI during the contract, so why keep it after?
Contractual proof of cover during the work and your own protection against later claims are two different things. Even after a client's requirement ends, allegations can surface, so continuous cover usually protects you better than the contract strictly demands.
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.