Legal Signature Requirements UK

04th March 2026

Updated: Thursday 26th March 2026

Legal Signature Requirements UK can be confusing. The law sets out clear rules about what makes a signature valid and it’s not too difficult if you prepare correctly.

What’s a legally valid signature in the UK?

A valid signature is any mark on the page that shows a person genuinely intends to approve the contents of a document.

It could be a full handwritten signature, but also be initials, a mark or even a typed name (in certain contexts, although not for an LPA).

The key factor to consider is intent. The person signing must understand the document and understand the legal intent behind it.

For some simple contracts, a signature isn’t always required because a verbal agreement can sometimes be legally binding. For important legal documents like deeds, wills and LPAs, stricter rules will always apply.

When does a signature need to be witnessed?

A witness must usually:

• Be aged 18 or over
• Be physically present when the person signs
• Not have a vested interest in the document

The witness will need to sign the document themselves to confirm they saw the person they’re witnessing sign already.

Remote witnessing isn’t acceptable for LPAs. It’s a non-negotiable the witness must always be in the same room at the time of signing.

Are electronic signatures legally recognised for LPAs?

Electronic signatures are legally recognised in the UK for many types of documents.

Typing your name into an online contract can be valid if there is a clear intent to agree.

However, documents like a Lasting Power of Attorney must still have a handwritten signature signed in ink. Digital signatures aren’t currently accepted by the OPG, although it is under consideration for the future.

What are the signature requirements for a Lasting Power of Attorney?

A Lasting Power of Attorney has strict signing rules.

• The donor must sign first.
• Their signature must be witnessed by someone who is over 18 and who isn’t named as an attorney in the LPA.
• Attorneys must then sign to confirm they accept the role. Their signatures must also be witnessed.

If the signing order is wrong, the LPA will be rejected.

Each signature must be clear, in wet ink (not electronic or scanned) and completed in the correct order.

What common mistakes cause problems?

Using the wrong witness. Signing in the wrong order. Missing dates or incomplete details.

These are all small errors that can lead to delays and extra costs when registering your LPA.

How can you make sure your signature is compliant?

Read our Power of Attorney Online registration guidance that comes with your LPA documents carefully to ensure each signature is valid and will be accepted by the OPG.

Legal signature requirements for LPAs in the UK aren’t complicated once you get your head around them. The key is to treat these important documents with care and make sure every signature is properly completed, witnessed and dated.

Getting this right protects you and ensures your legal documents stand up to scrutiny when they are needed most.