What Contracts Must Be in Writing? (English Law)

The general rule, and the exceptions that bite

The default in English law is permissive. Most contracts are binding whether they are written, spoken, or pieced together from an email chain or a messaging-app thread. Writing is good evidence, but it is not usually a condition of validity.

Six categories break that default. Here statute imposes a writing requirement, so getting the formality wrong does not just make the deal hard to prove - it can mean there is no enforceable deal at all. Knowing the list is the difference between a binding bargain and a void one.

1. Land sales and transfers - Law of Property (Miscellaneous Provisions) Act 1989, s.2

A contract for the sale or other disposition of land must be in writing, must incorporate all the agreed terms, and must be signed by or on behalf of both parties.

An oral land deal does not merely fail for want of proof; it is void. This is the setting in which an email signature can quietly satisfy the signing requirement, as Neocleous v Rees showed, so the writing and signature should be handled with care rather than left to informal exchanges.

2. Guarantees - Statute of Frauds 1677, s.4

A guarantee - a promise to answer for another person's debt or default - must be evidenced in writing and signed to be enforceable.

A purely verbal guarantee is unenforceable, which regularly surprises people who gave informal assurances that someone else's obligation would be covered. If you want a guarantee to stand, capture it in a signed document rather than a conversation.

3. Intellectual-property assignments - CDPA 1988 s.90(3); Patents Act 1977 s.30(6); Trade Marks Act 1994 s.24(3)

Transferring ownership of copyright, patents or trade marks requires a written assignment signed by the assignor, who is the party giving up the rights.

An oral promise that someone can have the rights does not move legal title. Until the written, signed assignment exists, ownership stays where it was - a frequent gap in startup, agency and contractor arrangements where IP was assumed to have transferred.

4. Statutory assignment of debts - Law of Property Act 1925, s.136

To assign a debt as a statutory, or legal, assignment, the assignment must be in writing and express notice must be given to the debtor.

Skip the formalities and you may not achieve a clean legal assignment, which affects who can enforce the debt and how. The writing and the notice are not optional extras; they are what makes the assignment work as intended.

You can agree orally to sell shares, but the transfer itself requires a written stock transfer form signed by the seller.

So the bargain and the mechanism are separate steps. A handshake may bind you to sell, yet legal title does not pass until the written instrument is completed, which matters for when the buyer actually becomes the owner of record.

6. Regulated consumer credit - Consumer Credit Act 1974

Regulated consumer credit agreements must meet specific written-form requirements, including prescribed information and signatures.

Get the form wrong and the agreement can be unenforceable, in whole or in part depending on the failure. These are technical rules, and the cost of non-compliance falls on the lender, which is why regulated lending is so document-driven.

Why getting the formality right pays off

In each of these categories the cost of informality lands at the worst possible moment - when you try to enforce. A buyer discovers the land contract is void, a creditor finds the guarantee unenforceable, a company learns it never owned the intellectual property it built its product on.

None of that requires bad faith on the other side; it just requires someone to take the formal point when it suits them. Treating the writing requirement as part of closing the deal, rather than paperwork to follow up later, is what removes that exposure.

How to spot these in a live deal

The practical skill is recognising, early, that a transaction touches one of the six. Anything involving land, a promise to cover another party's debts, the transfer of IP or shares, the assignment of a debt, or regulated credit should trigger the writing question before anyone relies on an informal agreement.

Get that recognition right and the formality is just a step in doing the deal. Get it wrong and a perfectly clear understanding can turn out to bind no one - which is far more costly to discover late than to handle at the outset.

What this means in a digital deal

The takeaway is not that writing is hard to achieve. Thanks to electronic signatures, being in writing and signed is easier to satisfy than ever, and a properly executed electronic document will usually do.

The real takeaway is to check whether your transaction is one of the six before relying on a chat or a call. Where it is, treat the formality as part of doing the deal, because an enforceable handshake in most contexts can be a void or unenforceable one here.

Use at the desk

Practical checklist

Before relying on an oral or messaging deal, check whether it falls in one of the six categories.
Land: in writing, all terms included, signed by both - or it is void.
Guarantees and IP assignments: written and signed, or they don't bind or don't transfer.
Debt assignments: written, with notice to the debtor.
Share transfers and consumer credit: complete the prescribed written instrument and information.
Flag any land, IP, guarantee, share or credit deal for the writing question early.

This guide is informational only and is not legal advice. It does not replace advice from licensed counsel on the facts of a specific transaction.

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