What does it cost to contest probate?

Last reviewed 18 August 2026

The entry fee is trivial; the risk is not. Contesting a will begins with a £3 caveat and can end with a bill that swallows a good part of the estate — including, if you lose, the other side’s costs.

What the stages cost

Early work — a caveat, initial investigation, and a Larke v Nugus request — typically runs £3,000–£8,000. Reaching a settlement at mediation is often £8,000–£20,000 all in. Issued proceedings resolved before trial commonly cost £15,000–£35,000; a full contested trial, £35,000–£100,000 or more per side. A will-validity challenge sits at the higher end; an Inheritance Act 1975 claim is often £8,000–£35,000.

The loser-pays risk — and mediation

The general rule is that the losing party pays the winner’s costs, which is what makes these disputes so financially dangerous. Mediation typically halves the total, and courts expect the parties to try it. For most people it is the sensible course long before a courtroom comes into view.

Sources. Industry cost ranges (SolicitorCost and comparable 2026 sources); civil costs “loser pays” general rule; caveat £3.