What is a codicil?
A codicil is a short document that amends an existing will without replacing it — for example to change an executor or update a gift. It must be signed and witnessed in the same way as a will (two independent witnesses present together). Codicils suit small, simple changes; for anything substantial, making a new will is usually clearer and safer.
Detailed explanation
A codicil sits alongside your will and is read together with it.
Good uses for a codicil
- Changing or adding an executor.
- Updating a specific cash gift.
- Adding a small new gift.
When a new will is better
- Several changes at once.
- Major changes to who inherits the residue.
- After marriage, divorce or other big life events.
Multiple codicils can become confusing and create inconsistencies, so once changes pile up, a fresh will that revokes the old one is cleaner.
How to do it properly
A codicil must meet the same execution rules as a will: in writing, signed by you, and witnessed by two independent people present at the same time. Don't amend the will itself by hand.
George wants to swap one of his two executors after a friend moves abroad. Rather than rewrite his whole will, he signs a short codicil naming the replacement, witnessed by two neighbours. The codicil is read together with his existing will.
- Complete the questionnaireA few guided questions about you, your family and your wishes.
- Structured reviewYour answers are checked automatically for completeness and consistency before your will is produced.
- Receive your documentsYour will and supporting paperwork are produced, ready to print.
- Sign correctlyClear instructions on signing and witnessing so the will is legally valid.
- Protect your familyYour wishes are recorded and your loved ones are spared the intestacy default.
Sources
- Wills Act 1837, section 9 (valid execution) — legislation.gov.uk
- GOV.UK — Making a will
- Citizens Advice — Wills
- Reviewed by
- ClearLegacy editorial team
- Last reviewed
- June 2026
- Next review
- December 2026
- Jurisdiction
- England & Wales
Frequently asked questions
What is a codicil?
A codicil is a short legal document that makes a change to an existing will without rewriting it — such as changing an executor or updating a gift. It must be signed and witnessed in the same way as a will.
Does a codicil need to be witnessed?
Yes. A codicil must meet the same execution rules as a will: in writing, signed by you, and witnessed by two independent people present at the same time who are not beneficiaries.
Codicil or new will — which should I use?
Use a codicil for a small, simple change. For multiple or major changes, or after a big life event like marriage or divorce, make a new will that revokes the old one to avoid confusion.
Make your will the simple way.
ClearLegacy guides you through a valid England & Wales will online, professionally structured and guided at every step.
Start your will