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Who Can Witness a Power of Attorney Signature?

Jul 17, 2026

Wills and Probate Executive

The requirement to be physically present is absolute. A signature cannot be witnessed online via a video call like Zoom or FaceTime, or even through a window.

Creating a Lasting Power of Attorney (LPA) is one of the most important steps you can take to protect your future. It ensures that if you cannot make your own decisions, someone you trust has the legal authority to act for you. This provides valuable peace of mind. In recent years, the number of LPAs registered annually in the UK has surpassed one million, showing a growing understanding of how vital this document is.

However, for an LPA to be legally valid, it must be signed and witnessed correctly. The rules can seem complex. Mistakes in the signing process are the most common reason the Office of the Public Guardian rejects applications. This can lead to delays, added stress and further costs.

This guide outlines who can witness a power of attorney signature in the UK, while also helping you avoid common pitfalls and establishing your document is valid.

Power of attorney POA legal document and pen

What is a Lasting Power of Attorney?

An LPA is a legal document that lets you (the ‘donor’) appoint one or more people (known as ‘attorneys’) to make decisions for you. Your attorneys can help you make decisions or make them on your behalf if you lose the mental capacity to do so yourself.

There are two types of LPA:

  • Health and Welfare LPA: this gives an attorney the power to make decisions about things like your daily routine, medical care, and even life-sustaining treatment decisions. It can only be used when you are unable to make your own decisions.
  • Property and Financial Affairs LPA: this gives an attorney the power to make decisions about your money and property, such as managing a bank account, paying bills, or selling your home. This type of LPA can be used as soon as it is registered, with your permission.

For the document to be legally binding, it must be signed correctly by the donor, the attorneys and a certificate provider, with most of these signatures needing a witness.

The different roles in the signing process

To understand the witnessing rules, it’s helpful to be clear on who is involved in signing the LPA forms.

  • The donor: this is you - the person making the LPA and appointing others to act for you.
  • The attorney(s): the trusted people you appoint to make decisions. You can appoint more than one attorney.
  • The replacement attorney(s): individuals who will step in if one of your original attorneys can no longer act on your behalf.
  • The witness: this person’s role is to be physically present when a signature is made and then sign the document to confirm they saw it. They are verifying the act of signing.
  • The certificate provider: this is a separate, important role. This person signs to confirm that you, the donor, understand the power and authority you are giving away, and that no one is pressuring you.

Confusing the role of a witness with that of a certificate provider is a frequent cause of errors. While one person can sometimes fill both roles, their responsibilities are very different.

Who can witness a power of attorney signature?

UK rules for witnessing a donor's signature are strict because this is the moment you give legal authority to your attorneys.

To be a valid witness for the donor, the person must meet three simple criteria:

  • They must be 18 years of age or older.
  • They must have mental capacity.
  • They must be physically present to watch you sign the document.
  • They must not be named in the LPA as an attorney

The requirement to be physically present is absolute. A signature cannot be witnessed online via a video call like Zoom or FaceTime, or even through a window. The witness must be in the same room.

It is also strongly recommended to use an independent witness where possible, such as a neighbour or a friend. This prevents any potential future claims that you were under pressure or influence from family members when you signed.

The critical role of the certificate provider

Every LPA must be signed by a certificate provider. Their role is to provide an independent safeguard, confirming that the donor has the mental capacity to create the LPA and is doing so freely.

It is vital not to confuse the certificate provider with a witness. A witness just confirms they saw a signature, whereas a certificate provider confirms your understanding of the entire document.

There are two categories of people who can act as a certificate provider:

  • A knowledge-based provider: someone who has known you personally for at least two years, such as a friend, a neighbour, or a colleague.
  • A skills-based provider: a professional who has relevant skills to assess your understanding, such as a solicitor, a doctor, or a social worker.

The following people are not allowed to act as your certificate provider:

  • An attorney or replacement attorney named in the LPA.
  • A member of the donor’s or any attorney’s family (this includes spouses, children, parents, siblings, in-laws and step-relatives).
  • An unmarried partner of the donor or any attorney.
  • A business partner or employee of the donor or any attorney.
  • The owner, manager or an employee of a care home where the donor lives.

The correct order of signing and why it matters

One of the most common reasons an LPA is rejected is because it was signed in the wrong order. The process must be followed exactly for the document to be valid.

The LPA must be signed in this sequence:

  1. The donor signs first. Their signature must be witnessed at the same time.
  2. The certificate provider signs next. They must sign after the donor.
  3. The attorneys and replacement attorneys sign last. Each attorney’s signature must be witnessed. All attorneys can sign at the same time or on different dates, but it must be after the donor has signed.

If this order is wrong, the Office of the Public Guardian will not register the power of attorney, and you will have to start the process again.

Because an LPA can give your attorneys significant authority, it is important that the document is prepared carefully. It should accurately reflect your wishes, clearly set out who you want to act for you, explain how decisions should be made and ensure your attorneys have the right powers to support you if they are ever needed.

This is why it is recommended to speak to a solicitor before making an LPA. A solicitor can help you understand your options, choose suitable attorneys, decide whether they should act jointly or independently, and consider whether any additional instructions or preferences should be included. They can also identify potential issues, such as family disagreements, complex finances, business interests, concerns about mental capacity or safeguarding risks.

You may benefit from speaking to a solicitor if:

  • Your financial affairs are complex, for example, you own multiple properties, have investments, business interests or overseas assets.
  • You want to appoint more than one attorney and need advice on whether they should act jointly, jointly and severally, or in different ways for different decisions.
  • Your family circumstances are more complicated, such as second marriages, blended families, estranged relatives or concerns about potential disagreements.
  • You are a business owner and need to consider how decisions would be made about your business if you became unable to manage your affairs.
  • There are concerns about the donor’s mental capacity or whether they fully understand the nature and effect of the Lasting Power of Attorney.
  • You want to include preferences or instructions and need help making sure they are clear, workable and legally appropriate.
  • You are worried about safeguarding, undue influence or choosing the right person to act as your attorney.
  • You want reassurance that the forms are completed, signed, witnessed and registered correctly to reduce the risk of rejection by the Office of the Public Guardian.

At Walker Foster, our experienced private client solicitors can guide you through the Lasting Power of Attorney process with care, clarity and professionalism. We take the time to understand your circumstances, explain your options in plain English and help you make decisions that protect your interests and give peace of mind to you and your family.

Our approach is friendly, supportive and transparent. We will keep you informed throughout the process, answer your questions clearly and ensure your document is prepared with care. As a firm trusted by generations, Walker Foster is committed to helping clients plan ahead with confidence.

Contact Us

If you would like advice on creating, reviewing or witnessing a LPA, our experienced team is here to help.

At Walker Foster, we provide clear, practical guidance tailored to your personal circumstances. We can help ensure your wishes are properly recorded, your attorneys understand their role and your LPA is prepared correctly and validly.

Whether you are planning ahead for yourself, supporting a loved one or have questions about the LPA process, we will take the time to listen, explain your options and guide you with care and professionalism.

Get in touch today to speak to our friendly team and find out how we can help you put the right arrangements in place with confidence.

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Powers of Attorney (PoA) and Lasting Powers of Attorney (LPA) provide peace of mind that, should you become unable to make decisions yourself, a trusted person you have chosen will act on your behalf. They will be able to manage your affairs in line with your wishes, ensuring important matters are handled with care and responsibility.

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