Expert witness fees sit at an awkward junction. The expert agrees a fee with the party who instructs them, and that arrangement is a private contract. The amount that can be recovered from the other side is a different question, decided later, by the court, against the tests of reasonableness and proportionality. Between those two points sit the permission stage, the costs budget, the recoverable caps and the invoice. This guide walks through each of them, using Part 35 of the Civil Procedure Rules, Practice Direction 35, Practice Direction 27 and the Civil Justice Council's Guidance for the Instruction of Experts in Civil Claims.

The practical bottom line

  • The instructing party pays. Terms of appointment are agreed at the outset, usually an hourly or daily rate with an estimate of time, or a fixed fee for a defined report.
  • The court sees the cost before it grants permission. An application must include an estimate of the cost of the proposed expert evidence (CPR 35.4(2)).
  • Recovery is capped and assessed. The court can limit what a party recovers from another party (CPR 35.4(4)), and in the small claims track the recoverable sum is capped at £750 for each expert.
  • Outcome-based fees are discouraged. A fee that depends on the result puts the expert's independence under strain and the court is unlikely to consent to it.

How much does an expert witness cost?

There is no published rate card. The fee turns on the specialty, the complexity of the issues, the volume of records, whether imaging has to be viewed, the type of report, how quickly it is needed, and whether the expert has to attend a hearing or a meeting of experts. A short condition and prognosis report in a straightforward orthopaedic claim and a liability report in a birth injury claim are different pieces of work with different price points, and both are priced against the time they take.

Three fee structures are common in UK civil claims:

  • Hourly rate with an estimate of hours. The most common arrangement for medico-legal work. The estimate matters, because the instructing party needs it for the court and the client needs it for the budget.
  • Fixed fee for a defined report. Used where the scope can be pinned down, and required in some low value injury claims where a fixed cost medical report is mandated under CPR 35.4(3B).
  • Daily or half-day rate for attendance. Covers a meeting of experts, a hearing, or concurrent evidence. Travel and waiting time are usually dealt with separately.

Paragraph 17 of the Civil Justice Council guidance sets out what the terms of appointment should normally cover: the capacity in which the expert is appointed, the services required, the time for delivery of the report, the basis of charges including an estimate of the time likely to be required or a fixed fee, travelling expenses and disbursements, cancellation charges, fees for attending court, the time for payment, and whether the expert's charges will be subject to assessment if a party is publicly funded. It also notes that the court may limit the expert's recoverable fees. Agreeing all of that in writing at the outset is the single most effective way to avoid a fee dispute later.

Who pays an expert witness?

The party who instructs the expert pays the expert. That is true whoever eventually succeeds in the claim, and it is true even where the other side is later ordered to bear the costs. The expert's overriding duty to the court under CPR 35.3 overrides any obligation to the party paying the fee, so the invoice relationship does not change the independence of the opinion.

A single joint expert is paid differently. Under CPR 35.8, each instructing party may give instructions, copied to the other parties, and unless the court otherwise directs the relevant parties are jointly and severally liable for the expert's fees and expenses. Before an expert is instructed, the court can also limit the amount that may be paid and direct that some or all of the parties pay that amount into court (CPR 35.8(4)). Joint and several liability means the expert can look to any one instructing party for the whole fee, which is why the terms of appointment for a joint instruction need to say plainly who is paying and when.

Answers to written questions are paid for by the instructing party too. Paragraph 6.2 of Practice Direction 35 provides that the party or parties instructing the expert must pay any fees charged for answering questions put under CPR 35.6, and that this does not affect any later decision about who ultimately bears the expert's fees. If a question set is long or goes beyond clarification, the cost of answering it can be material, so it is worth flagging early.

What does the court want to know about cost?

Cost belongs in the permission application itself. CPR 35.4(2) requires a party applying for permission to call an expert or rely on a report to provide an estimate of the costs of the proposed expert evidence and to identify the field in which expert evidence is required and the issues it will address, and, where practicable, the name of the proposed expert. Permission is then granted only in relation to the named expert or the identified field, and the order may specify the issues the evidence should address.

Two further limits sit around that. CPR 35.4(4) allows the court to limit the amount of a party's expert's fees and expenses that may be recovered from any other party. And in multi-track cases the expert's fee is a disbursement inside the costs budget, so the estimate given at the permission stage has to survive contact with the budget and with any variation application.

The practical consequence for an expert is that the estimate has to be realistic and specific. An estimate that says "to be confirmed" invites a direction, and an estimate that is quietly exceeded creates a conversation the instructing solicitor would rather not have. Where the instruction is genuinely uncertain, say so and explain what the uncertainty depends on, such as the volume of records still to arrive.

What is the limit in the small claims track?

In the small claims track, Practice Direction 27 paragraph 7.3 sets the sum a party may be ordered to pay for experts' fees at no more than £750 for each expert. That cap limits what the other party can be ordered to pay. The expert can still charge more than £750, so the difference normally sits with the party who instructed them. Small claims also work differently in kind: expert evidence is usually a written report from one expert on a particular issue, with oral evidence only in exceptional circumstances.

For a claimant weighing up whether expert evidence is worth it in a modest claim, that £750 figure is the number to know. It is also the reason some claims settle on the papers with a single joint expert report rather than two competing reports.

Are contingency fees allowed?

They are strongly discouraged. Paragraph 88 of the Civil Justice Council guidance states that payment of experts' fees contingent upon the nature of the expert evidence or upon the outcome of the case is strongly discouraged, and cites ex parte Factortame (No 8) [2003] QB 381, where the court said it would be a rare case indeed in which it would be prepared to consent to an expert being instructed under a contingency fee agreement.

The reason is structural. If the fee rises with the strength of the opinion, the expert has an interest in the opinion, and CPR 35.3 requires the opinion to be independent of the pressures of litigation. A deferred or conditional fee may still be lawful in an unusual case, and it should be disclosed in the report's statement of instructions, because the court is entitled to know the basis on which the expert was retained.

A fee that moves with the answer is a fact the report has to disclose, because the court is entitled to know what the opinion cost and how it was paid for.

How should an expert record time?

Time recording is what turns an estimate into an invoice that can be defended. Record it as the work happens, by task, and keep the tasks recognisable to the instructing party: records review, imaging review, chronology, report drafting, questions, expert discussion, attendance. An invoice whose lines map onto the categories in the original estimate is far easier to justify in an assessment than a single figure for "expert report".

Three habits make the difference. Note the date each batch of records arrived, because the time spent chasing and re-reading is a real cost that should be visible rather than absorbed. Record reading and drafting separately, since a report that took forty hours of records review and four hours of drafting looks very different from the reverse when it is scrutinised. And keep disbursements such as courier, copying or imaging costs apart from professional time.

What brings expert costs down without cutting corners?

Most of the cost in a medico-legal instruction sits in the records, and most of the waste sits in doing the same reading twice. A few things reduce it without touching the quality of the opinion:

  • Get the records right first time. A complete set at the start removes the re-read that follows a second disclosure tranche. Our guide to what to do when disclosure has gaps covers the practical steps.
  • Build the chronology while you read. Reading the records to build the chronology and then reading them again to write the report is the most common duplication in the workflow.
  • Agree the issues before the expert starts. Narrow, well-defined questions produce shorter reports. What instructing solicitors want from a report sets out what a firm is actually looking for.
  • Use a single joint expert where the issue is narrow. CPR 35.7 exists for exactly that case, and one report is cheaper than two.

The market context makes this more pressing than it used to be. Legal Futures reported in August 2026 that the value of the medico-legal market is back above £700m for the first time since 2019, at an estimated £705m, while the number of active accredited medical experts on MedCo fell to 429 from 513 in 2023. A smaller pool of experts carrying a growing volume of work puts a premium on the hours each expert can actually spend on opinion rather than administration.

How ALLDOQ fits

Fee disputes tend to be disputes about what the time was spent on. ALLDOQ keeps the records, the chronology, the report and the time in one workspace, so each entry carries its date and source and the time recorded sits against the task it belongs to. When the invoice arrives, the estimate, the records received and the work done are in the same place. To see it on a live instruction, book a walkthrough.

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