01/06/2026
We often see posts from people asking why solicitors firm's charge so much for Will writing when you can do it yourself for free, or use an unregulated "Will writer" for less than £100. So We thought it might be useful to put together some of the common problems our probate team have seen where Wills have gone wrong either by DIY or through using "Will writers".
1. Incorrect witnessing (the most common fatal error)
A will must be signed by the testator in the presence of two witnesses who are present at the same time, and the witnesses must then sign in the testator's presence.
Common mistakes:
• Witnesses sign on different days.
• One witness is not present when the will is signed.
• The testator signs alone and later asks people to witness it.
• Witnesses do not actually see the signature being made or acknowledged.
• Only one witness signs.
• Signatures are added later without a proper witnessing ceremony.
Potential consequence: the entire will may be invalid.
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2. Using beneficiaries as witnesses
Many DIY will makers ask family members to witness the will.
If a beneficiary witnesses the will, or the spouse/civil partner of a beneficiary witnesses it, the will itself usually remains valid but that beneficiary's gift can fail.
Common examples:
• A son witnesses a will that leaves him the house.
• A daughter's husband acts as a witness.
• An executor-beneficiary witnesses the will.
Potential consequence: the intended inheritance may be lost.
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3. Making handwritten changes after signing
People frequently:
• Cross out names.
• Write new gifts in margins.
• Change percentages.
• Alter executor details.
Changes made after ex*****on generally require the same formalities as the original will. Unwitnessed alterations may be ineffective.
Potential consequence: the original wording remains effective, or disputes arise over what was intended.
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4. Marriage after making the will
A surprisingly common DIY mistake is failing to appreciate that marriage generally revokes an earlier will unless it was drafted in contemplation of that marriage.
Typical scenario:
• Person writes a will leaving everything to children.
• Later marries.
• Never updates the will.
Potential consequence: the old will may be revoked entirely.
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5. Ambiguous wording
Untrained drafters often use language that seems clear to them but is legally uncertain.
Examples:
• "I leave my house to my children."
o Which children?
o In equal shares?
o What if one dies first?
• "I leave my savings to my family."
o Who counts as family?
• "My partner gets everything."
o Which partner if relationships change?
Potential consequence: costly probate litigation to determine meaning.
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6. Failing to deal with the residue of the estate
A common amateur error is listing specific gifts but forgetting everything else.
Example:
• £10,000 to niece.
• Watch to nephew.
• Car to friend.
But no clause dealing with the remainder of the estate.
Potential consequence: part of the estate passes under intestacy rules rather than under the will.
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7. No substitute beneficiaries
DIY wills often say:
"I leave my estate to my wife."
But fail to answer:
What happens if she dies first?
Professional drafts usually include fallback provisions.
Potential consequence: unintended intestacy.
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8. Poor identification of beneficiaries
Examples:
• Using nicknames.
• Misspelling names.
• Referring to people vaguely.
• Forgetting to identify charities properly.
This is a common DIY problem.
Potential consequence: uncertainty and estate disputes, delay, or failed gifts.
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9. Failure to revoke previous wills
DIY wills sometimes omit a clear revocation clause.
Result:
• Multiple wills found after death.
• Confusion about which document governs.
Potential consequence: probate disputes and construction proceedings.
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10. Inadequate provision for executors
Common mistakes:
• No executor appointed.
• Executor has died.
• Executor lacks capacity.
• No substitute executor named.
• No clause allowing for substitute executors to be appointed.
Potential consequence: additional court applications and delay.
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11. Capacity and undue influence issues
Unregulated will writers often lack training in assessing testamentary capacity and spotting coercion.
Warning signs:
• Elderly testator with cognitive decline.
• Relative answering all questions.
• Beneficiary present throughout instructions.
• No attendance notes kept.
A will requires the testator to be of sound mind and acting voluntarily.
Potential consequence: a later challenge alleging lack of capacity or undue influence.
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12. Failure to keep evidence of ex*****on
Solicitors typically keep:
• Attendance notes.
• File records.
• Witness details.
DIY wills often have none of this.
Years later:
• Witnesses cannot be found.
• Witnesses cannot remember the signing.
• Signatures are challenged.
Potential consequence: expensive evidential disputes during probate.
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13. Not accounting for blended families
DIY wills are particularly risky where there are:
• Stepchildren.
• Second marriages.
• Cohabiting partners.
• Children from different relationships.
Potential consequence: outcomes that differ dramatically from the testator's intentions and/or expensive legal challenges.
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14. Digital-only or improperly executed online wills
People sometimes assume:
• A PDF saved on a computer is enough.
• An electronic signature is sufficient.
• An online form automatically creates a valid will.
Current law in England generally requires a properly executed written will with the statutory signing formalities.
Potential consequence: no valid will at all.
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15. Using a template that does not fit the circumstances
The classic DIY problem is using a generic template for a non-generic estate.
Examples:
• Business ownership.
• Foreign assets.
• Trusts.
• Agricultural property.
• Inheritance tax planning.
• Vulnerable beneficiaries.
Potential consequence: technically valid will, but ineffective or damaging estate planning.
The financial cost of getting a Will wrong often far outweighs the cost of instructing a professional at the outset.
The emotional cost of getting a Will wrong is beyond calculation - losing a loved one and having to spend months and years unravelling a difficult estate is not something anyone should have to go through.