Comparison · Estate Planning · 2026
Guardianship vs Power of Attorney UK 2026: Which Applies and When?
Guardianship and power of attorney are both about someone else being legally empowered to make decisions for a person who cannot make them alone — but one applies to children and the other to adults, and the legal routes are entirely different. Here is the full 2026 comparison and why they are not interchangeable.
TL;DR - 30-Second Summary
- - Guardianship: family-court process giving an adult parental responsibility for a child (commonly a Special Guardianship Order)
- - Power of attorney: a competent adult chooses someone in advance to make decisions if they later lose mental capacity (£82 per LPA registration)
- - No overlap: LPAs cannot apply to children; guardianship orders cannot apply to adults losing capacity
Side by Side: Guardianship vs Power of Attorney
| Feature | Guardianship (SGO) | Lasting Power of Attorney |
|---|---|---|
| Who it protects | Children under 18 | Adults aged 18+ |
| Who applies/sets it up | Relative or carer applies to family court | The donor, while they still have capacity |
| When it takes effect | Once the court makes the order | Once registered and (for H&W) capacity is lost |
| Typical cost | Court fee + possible legal costs | £82 per LPA registration fee |
| Alternative if not set up | Local authority/court intervention for the child | Court of Protection deputyship (slower, costlier) |
What Is Guardianship for a Child?
In English and Welsh family law, guardianship most commonly refers to a Special Guardianship Order (SGO), through which the family court grants a relative or carer parental responsibility for a child who cannot live with their birth parents. It sits between fostering (temporary, local authority-supervised) and adoption (permanent, severing the legal relationship with birth parents) — the child keeps their legal ties to their birth family while the special guardian gains day-to-day decision-making authority.
Parents can also separately name a "testamentary guardian" in their will, who takes on parental responsibility automatically if both parents die while the children are still minors — this is a simple, low-cost provision that avoids the child\'s care being left to court decision alone.
What Is a Lasting Power of Attorney?
A Lasting Power of Attorney is a legal document an adult (the donor) sets up while they still have mental capacity, naming one or more attorneys to make decisions on their behalf if they later lose capacity. There are two types in England and Wales: Property and Financial Affairs, and Health and Welfare, each registered separately with the Office of the Public Guardian for a fee of £82 each.
Without an LPA in place, if an adult loses capacity, their family must apply to the Court of Protection for a deputyship order — a slower, costlier, and more court-supervised process than using a pre-arranged LPA.
Why They Are Not Interchangeable
The confusion between the two terms usually arises because both involve someone else legally stepping in to make decisions for another person. But an LPA cannot be used for a child under 18, and a Special Guardianship Order has no relevance to an adult who has lost mental capacity. Anyone researching either topic should be clear on which situation they are actually planning for — a child\'s long-term care, or an adult\'s future incapacity — since the legal routes, costs and authorities involved are completely separate.