Prenups have an image problem - Hollywood divorces and a vote of no confidence in the marriage before it has even started. In reality, a prenuptial agreement is just a practical piece of grown-up admin for couples getting married, especially if either of you is bringing property, savings, a business, an inheritance or children from a previous relationship into the marriage. Here is the honest, plain-English version of how they work in the UK in 2026.
What is a prenup, exactly?
A prenuptial agreement (a "prenup") is a written agreement you make before you marry, setting out how you would divide your money, property and other assets if the marriage were to end. Made after the wedding, the same thing is called a "postnup". The point is not to plan for divorce - it is to have a clear, fair, agreed plan in place so that, if the worst happens, you are not fighting it out from scratch.
Are prenups legally binding in the UK?
This is the big question, and the honest answer is: not automatically - but they carry real weight. In England and Wales, a prenup is not strictly binding the way an ordinary contract is; a court always has the final say over finances on divorce. However, since the landmark Supreme Court case Radmacher v Granatino in 2010, the courts will generally uphold a prenup and give it decisive weight - as long as both people entered into it freely, with a full appreciation of what they were agreeing to, and the terms are fair. A prenup also cannot override a spouse's genuine needs or proper provision for any children. (Scotland has a separate legal system, where prenups are generally upheld more readily.)
And the direction of travel is clear: in 2026 the government opened a consultation on whether to make nuptial agreements formally binding in law for the first time. Nothing has changed just yet, but it tells you everything about how seriously prenups are now taken - a well-made one is increasingly likely to be respected, not less.
What makes a prenup actually hold up
A prenup is far more likely to be upheld if you tick these boxes:
- Sign it in good time - ideally at least 28 days before the wedding, not the night before. A last-minute agreement looks like it was signed under pressure.
- Full, honest financial disclosure on both sides - no hidden assets.
- Independent legal advice - each of you should ideally take your own advice from a separate adviser, so it is clear you both understood it.
- Fair terms that meet both partners' (and any children's) needs - a wildly one-sided agreement is the one most likely to be torn up.
- Properly written and signed by both parties.
Who actually needs a prenup?
Prenups are not just for the wealthy. They genuinely help if any of these apply:
- One or both of you owns a property, savings or investments before the marriage.
- Either of you owns or co-owns a business you want to protect.
- There is an expected inheritance, or family money and gifts in the picture.
- One partner is bringing significant debt into the marriage.
- Either of you has children from a previous relationship whose interests you want to safeguard.
- It is a second marriage, or you have been through a divorce before.
If none of that applies and you are both starting out with little, you may decide you do not need one - and that is a perfectly valid call too.
How much does a prenup cost, and how do you get one?
Traditionally, a prenup meant two solicitors and a bill of roughly £625 to £2,000 per person - so often well over a thousand pounds for a couple - which puts a lot of people off entirely. You can still go that route, and for complicated estates it is the right one. But for most couples the process is more straightforward than it sounds. There are now online services that guide you through drawing up a valid agreement properly - including the financial disclosure and the steps that make it hold up - for a flat one-off fee. UK Prenup, for example, lets you create your agreement and financial-disclosure forms online for a single £199 price covering both partners, and still (rightly) recommends you each take independent legal advice before you sign. Whichever route you choose, the key is to do it properly and in good time.
The bottom line
A prenup is not a sign you expect to divorce - it is the same instinct as insuring your home: you hope never to need it, and you are very glad to have it if you do. If you have assets, a business, children or an inheritance in the picture, a properly-made prenup is one of the more sensible things to sort before the wedding - right alongside the other grown-up admin, like sorting your name change afterwards.
Frequently Asked Questions
Are prenups legally binding in England and Wales?
Not automatically. A court has the final say on finances at divorce, but since Radmacher v Granatino (2010) the courts give a prenup significant weight where both partners entered into it freely, with full financial disclosure, a clear understanding of the implications, and fair terms.
Are prenups about to become legally binding in the UK?
Possibly. In 2026 the government opened a consultation on making nuptial agreements formally binding in law for the first time. Nothing has changed yet, but it signals the direction of travel - prenups are being taken more seriously, not less.
How much does a prenup cost in the UK?
Through solicitors, typically £625 to £2,000 per person - so often well over £1,000 for a couple. Online services such as UK Prenup offer a fixed price - £199 for both partners - for the agreement and disclosure forms, though you should still budget for independent legal advice.
When should we sign our prenup?
In good time before the wedding - at least 28 days beforehand is the common guidance, so it is clear neither of you signed under last-minute pressure.
Do we both need our own solicitor?
It is not strictly required, but each partner taking their own independent legal advice is one of the biggest factors in a prenup being upheld, so it is strongly recommended.
This article is general information, not legal advice. For your own circumstances, get advice tailored to you.