King's Counsel: what a KC is, and when your case actually needs one

If your case is heading towards a contested hearing, someone will eventually ask whether you need a King's Counsel. The answer matters more than most clients realise, because the gap between a KC's fees and a senior junior's fees can run to tens of thousands of pounds over the life of a case, and choosing wrongly in either direction can cost you. This guide explains what a KC is, the work they are genuinely used for, and how the courts treat the cost of instructing one.

What is a King's Counsel?

King's Counsel, usually shortened to KC, is a mark of distinction awarded to barristers (and some solicitor advocates) who have demonstrated excellence in advocacy at the highest level. The appointment is made by the Crown on the recommendation of an independent selection panel, following a competitive process that involves references from judges, opponents and instructing solicitors. Historically KCs were called Queen's Counsel during a Queen's reign, and you will still see the abbreviation QC on older cases and directories. The role is identical; only the title changes with the monarch.

KCs are often called silks, because they wear a silk gown in court rather than the ordinary stuff gown worn by junior barristers. You will also hear junior counsel described as juniors regardless of their age or experience. A junior of twenty years' call is still a junior; the word simply means not a KC.

Appointment as a KC is not a promotion within a firm or chambers. A KC remains a self-employed barrister, regulated by the Bar Standards Board like every other barrister. What changes is the work they take on and the fees they command.

What types of cases use a KC?

KCs are concentrated at the heavy end of litigation. The cases where clients most often instruct a KC include:

• High value commercial disputes in the High Court, particularly in the Commercial Court, Chancery Division and Technology and Construction Court, where the sums at stake justify senior advocacy
• Complex trials with difficult points of law, multiple parties or heavy expert evidence
• Appeals, especially to the Court of Appeal and the Supreme Court, where the argument is legal rather than factual
• Serious and high profile criminal cases, such as murder, large scale fraud and complex conspiracy trials
• High value or legally complex family finance cases, trusts disputes and contentious probate
• Cases where the other side has instructed a KC and there is a genuine risk of being outgunned at trial

A KC is also frequently instructed to give a written opinion on merits at an early stage, even where a junior will handle the hearings. A clear opinion from a recognised silk can settle a case, because the other side reads it and recalculates their own prospects.

What does a KC cost?

Fees vary enormously by practice area, seniority and chambers, but as a broad guide a KC's hourly rate will often be two to three times that of an experienced junior, and brief fees for a multi-day High Court trial regularly run into five or six figures. On top of the brief fee there are refreshers (the daily fee for each day of trial after the first), conference fees and preparation fees.

That premium is often money well spent. In a claim worth several million pounds, the quality of cross-examination and closing submissions can move the outcome by more than the entire fee difference. The problem arises at the other end of the scale, where a KC is instructed in a case that a competent junior could have run equally well.

Costs consequences: proportionality and unreasonable use

This is the part clients are rarely told. In most civil litigation, the losing party pays a contribution towards the winner's legal costs. Those costs are then assessed by the court, and the court will only allow costs that were reasonably incurred and proportionate to the matters in issue. Proportionality is not an afterthought; it is a standing rule of the Civil Procedure Rules, and judges apply it line by line on detailed assessment.

Instructing a KC is a classic flashpoint. If you win your case but the judge considers that a KC was unnecessary, for example because the claim was modest in value, legally straightforward, or listed for a short hearing, the court can refuse to allow the difference between the KC's fee and what a suitable junior would have charged. You then pay that difference yourself, out of your winnings. Where the case was clearly a junior matter, the KC's brief fee can be disallowed almost entirely and replaced with a junior's notional fee.

The same logic applies in budgeted cases. Most multi-track claims are now subject to costs budgeting, where each side files a budget and the court controls the spend phase by phase. A budget that assumes leading counsel in a case that does not warrant it is likely to be challenged by the opponent and trimmed by the judge at the case management stage, before the money is even spent.

There is also a tactical dimension. If you insist on a KC for a modest or straightforward claim, the other side will use it against you twice: first to argue your costs are disproportionate if you win, and second to argue that their own matching instruction of a KC was a reasonable response if they win. Unreasonable use of silk can inflate the costs bill on both sides, and someone has to pay it.

The flip side is equally real. Where the case is heavy and the other side instructs a KC, declining to match can be a false economy, and judges do allow the cost of a KC on assessment where the complexity, value or importance of the matter justified it. The question the court asks is not what did you spend, but was it reasonable and proportionate to spend it on this case.

When a senior junior is the better choice

Many of the barristers on our panel are senior juniors of fifteen or twenty years' call who spend their working lives in court. For a one or two day trial, an interim application, or a well documented dispute of moderate value, an experienced junior will usually match a KC's advocacy at half the fee or less. Instructing sensibly at that level also protects your costs recovery if you win, because the choice of counsel is one of the first things an opponent's costs draftsman attacks.

A sensible approach for most substantial cases is to take advice on merits early, budget the advocacy to the size of the claim, and reserve the KC for the stages where seniority genuinely changes the outcome: the trial of a heavy case, a difficult appeal, or the opinion that settles the matter before trial.

How we help you choose

Clerk&Counsel is an intermediary and clerking service. We do not provide legal advice ourselves; the barristers on our panel are independent professionals regulated by the Bar Standards Board, and they are responsible for the advice they give. What we do is match you with the right level of counsel for the case you actually have, with fees quoted in writing before you commit. Where a matter warrants a KC we will say so and tell you why. Where a senior junior will do the job just as well, we will tell you that too, because the costs consequences of getting it wrong land on you, not on us.

If you are weighing up counsel for a dispute, send us an outline through our contact form or use the find a barrister page, and a clerk will come back with options at more than one level of seniority. You can also read more about how direct access works and what to expect on barristers' fees.