Enforceability
Are prenups legally binding in the UK?
The honest answer is: not automatically — but a properly made prenup will usually be upheld. Here is what the law in England & Wales actually says, and what you have to get right.
In short: in England & Wales a prenup does not bind the court, because the court keeps its power to decide finances on divorce. But since Radmacher v Granatino [2010] UKSC 42 the rule is that the court should give effect to a nuptial agreement that was freely entered into by each party with a full appreciation of its implications, unless in the circumstances it would not be fair to hold the parties to it. In practice a prenup made with disclosure, independent advice and time is very likely to be followed.
The starting point: the court decides
Under the Matrimonial Causes Act 1973 the court decides how finances are divided on divorce, taking into account all the circumstances — including the needs of any children, each party's needs, contributions, and the standard of living during the marriage. A couple cannot contract that power away. That is why a prenup in England & Wales is different from one in, say, New York or most of continental Europe, where marital agreements are binding contracts.
What Radmacher v Granatino changed
In 2010 the Supreme Court considered a German prenup between a German heiress and a French banker. The Court held that the agreement should be given decisive weight, and set out the test that still applies:
"The court should give effect to a nuptial agreement that is freely entered into by each party with a full appreciation of its implications unless in the circumstances prevailing it would not be fair to hold the parties to their agreement."
Three things follow from that sentence, and they are the whole job:
- Freely entered into. No pressure, no ultimatum the week before the wedding, no significant imbalance in understanding. Time and independent advice are how you evidence this.
- Full appreciation of its implications. Each party knew what the other had and what they were giving up. That is what financial disclosure is for.
- Fair in the circumstances prevailing. The court looks at fairness at the time of the divorce, not just at signing. An agreement that leaves one party or the children without their needs met will not be enforced to that extent.
What a prenup cannot do
- It cannot leave either party unable to meet their reasonable needs, particularly housing.
- It cannot prejudice the needs of children of the family. Child arrangements and child maintenance are outside the agreement.
- It cannot bind the court on matters that were not foreseen and would make the agreement unfair — a serious illness, a long marriage with children when the agreement assumed neither.
Within those limits, a prenup is very effective at what most couples want it for: protecting pre-marital assets, inheritances, business interests and family money, and agreeing in advance how the wealth built during the marriage will be shared.
How to make a prenup that will be upheld
| Requirement | What it means in practice |
|---|---|
| Independent legal advice for both | Each party has their own solicitor and the agreement records that advice was given (or the opportunity was offered and declined). |
| Full financial disclosure | Each party's assets, income and liabilities are set out in a schedule. It does not need to be forensic; it must be honest and proportionate. |
| Signed in good time | At least 28 days before the wedding. Earlier is better. See timing. |
| Fair provision | The agreement addresses needs, housing and children rather than trying to exclude them. |
| Review clauses | Triggers for review — children, a set number of years, a major change in circumstances — so the agreement remains fair over time. |
| Proper execution | Signed as a deed, witnessed, dated. Notarised if it may be needed abroad. |
Are the rules about to change?
The Law Commission recommended in 2014 that "qualifying nuptial agreements" — agreements meeting set formal requirements — should be binding, subject to the parties' needs. In 2026 the government consulted on introducing them. No legislation has yet been enacted, so the Radmacher test remains the law. We draft every agreement to meet the proposed qualifying requirements anyway, so that if the law changes your agreement already complies. More on qualifying nuptial agreements.
Questions people ask
Frequently asked questions
Has a UK court ever refused to enforce a prenup?
Do we need a prenup if we are getting a civil partnership?
Is a prenup binding in Scotland?
Does a prenup need to be notarised to be valid in England?
Call us and tell us what you need
Tell us when the wedding is, where you both live, and roughly what you each own. We will tell you what the agreement needs to cover and quote one fixed fee — before you commit to anything.
Call 020 7499 2605Prefer email? ey@notarypubliclondon.co.uk