There is no law stopping you writing your own prenuptial agreement, and a free or DIY prenup can be valid. The problem is that the things which make a prenup actually hold up in England & Wales – full disclosure, fair terms, independent advice and correct execution as a deed – are exactly the things DIY versions tend to get wrong. This guide explains why DIY is risky, the common mistakes, and a safer route that keeps most of the saving without the pitfalls.
Is a DIY prenup ever a good idea?
A DIY prenup can be valid in principle, but it is rarely the best idea, because the things that make a prenup hold up are exactly what DIY versions tend to get wrong. If cost is the worry, a fixed-fee online agreement gives you most of the DIY saving without the DIY pitfalls, and you can still take advice on top. In other words, the choice is not really “DIY or expensive solicitor” – there is a well-structured, affordable middle option that removes most of the risk.
Why DIY is risky
A prenup in England & Wales is not automatically binding. Since Radmacher v Granatino (2010), a court gives an agreement weight only if it was entered into freely, with full financial disclosure, ideally with legal advice, and the terms are fair. A DIY document often has no proper disclosure schedule, vague or unfair terms, or wording that overclaims – any of which can see it set aside just when you need it. And because the court also keeps two backstops – meeting needs and providing for children – a home-made attempt to contract those away simply will not work.
The common DIY mistakes
- No full and frank financial disclosure from both partners.
- Terms that leave one partner in real need – a court will not uphold those.
- Trying to pre-decide child maintenance or arrangements, which you cannot do.
- Not executing it correctly as a deed, signed before an independent witness.
- Signing too close to the wedding, which invites a claim of pressure.
- Including unenforceable gaps or leaving assets undisclosed, which is one of the surest ways to have an agreement overturned.
Our guide to what to include shows how much a sound agreement really needs to cover – and how easy it is for a home-made version to fall short.
DIY, template or online – how they compare
| Option | Cost | Main risk |
|---|---|---|
| Fully DIY (write it yourself) | Free | Missing disclosure, unfair terms, wrong execution |
| Free/cheap template | Free–low | Generic wording, no disclosure schedule |
| Fixed-fee online agreement | From £199 | Low – structured, with disclosure and deed wording |
| Full solicitor draft | Four figures per side | Cost, not validity |
What people are really trying to save – and the better way to do it
Most people who consider a DIY prenup are not being reckless; they simply do not want to pay four figures to a solicitor for what feels like a simple document. That instinct is reasonable – but the answer is not to strip out the safeguards, it is to strip out the bespoke cost while keeping the safeguards. The expensive part of a solicitor prenup is the custom drafting and negotiation, not the disclosure schedule or the deed wording, which are fairly standard. A structured service reproduces those standard, weight-bearing elements at low cost, so you save on the right thing. Going fully DIY, by contrast, saves the last hundred pounds by throwing away the parts that make the agreement work – a bad trade. See how to get an affordable prenup for the sensible way to economise.
What the law actually requires – and why DIY struggles with it
To understand why home-made agreements so often fall down, it helps to see what a court looks for. Since Radmacher v Granatino (2010), an English or Welsh court will give effect to a prenup that a couple entered into freely and with a full appreciation of its implications, unless in the circumstances it would be unfair to hold them to it. In practice that means the court weighs disclosure, whether each partner understood what they were signing (which is where independent advice comes in), the absence of pressure or duress, sensible timing, and above all fairness. A DIY document rarely evidences all of that. It may have no schedule proving disclosure, no record that advice was offered, and wording a layperson cannot be sure is fair or even enforceable. The Law Commission’s proposed “qualifying nuptial agreements” – which would make agreements meeting strict conditions binding – are not yet law, so for now every prenup rests on this discretionary framework, and a thin DIY document gives a court little to work with.
A DIY horror story (and how to avoid it)
Consider a couple who found a free American prenup template online, changed a few words, and signed it themselves without witnesses two days before flying out to marry. It referred to “community property” – a concept that does not exist in England & Wales – listed no assets, and neither took advice. When they later separated, the document was practically worthless: wrong jurisdiction, no disclosure, no independent advice, signed under time pressure, and not executed as a deed. Every ingredient that gives a prenup weight was missing. The lesson is not that you must spend thousands – it is that the document has to be built for England & Wales and made properly. A structured service designed for this jurisdiction avoids each of those traps by default.
If you are still set on writing your own
Some people will draft their own regardless, so if that is you, at least reduce the risk. Both of you should complete full and frank disclosure and attach it as a schedule. Give the terms a genuine fairness check so neither of you is left in need. Leave plenty of time – ideally at least 28 days before the wedding, as the Law Commission suggested – and sign it as a deed before an independent witness. Most importantly, each take independent legal advice on the draft; a lawyer reviewing a finished document is far cheaper than one drafting from scratch, and it plugs the single biggest gap in most DIY attempts. Even then, be honest with yourselves about whether a home-made document really covers everything it should.
A safer, still-affordable alternative
A fixed-fee online service gives you a properly structured agreement with a disclosure schedule and correct execution wording for £199 – most of the DIY savings, without the DIY pitfalls (see prenup costs and affordable prenups). You can still take independent legal advice on top, which is the popular middle ground. For the price of a nice dinner you remove nearly all the risk that comes with going it alone.
DIY prenup: FAQs
Can you write your own prenup in the UK?
There is no law stopping you, but a poorly drafted DIY prenup can be worse than none at all because it may be set aside when relied on (see prenup templates).
Are free prenup templates safe?
Treat them with caution – most miss the disclosure and fair terms a court looks for (see what to include).
Is a DIY prenup legally binding?
No prenup is automatically binding in England & Wales, DIY or not – but a DIY one is more likely to fall down on disclosure, fairness or signing (see are prenups legally binding?).
Does a DIY prenup need to be witnessed?
Yes – to be effective it should be executed as a deed and signed before an independent witness, a step DIY versions often miss (see executed as a deed).
What is the cheapest safe way to get a prenup?
A fixed-fee online agreement from £199 gives you the structure and disclosure a DIY version lacks, for a fraction of solicitor fees (see prenup costs).
Can I use a US or overseas prenup template?
Better not to. Templates written for other legal systems use concepts – like “community property” – that have no place in England & Wales, and can confuse rather than help. Use a document built for this jurisdiction (see UK prenup templates).
Is a handwritten prenup valid?
Form is less important than substance, but a handwritten note almost never has the disclosure, fair terms, advice and deed execution a court looks for. Treat it as no substitute for a properly made agreement (see verbal and informal prenups).
Does a DIY prenup need independent legal advice?
It is not strictly compulsory, but advice is one of the main factors that help an agreement carry weight, and its absence is a common reason DIY prenups are challenged (see do both partners need a lawyer?).
Create your prenuptial agreement online
UK Prenup lets couples in England & Wales create a clear, fair prenuptial agreement online from £199, with your document generated instantly as a PDF. See how it works or get started.
UK Prenup is not a law firm and does not provide legal advice. A prenuptial agreement in England & Wales is not automatically binding, and both partners should take independent legal advice before signing.