Formal Notice Letter (Mise en Demeure)

A formal notice (mise en demeure) is a firm written demand that someone fulfil an obligation — pay an unpaid amount, deliver, or carry out work — within a set deadline. It is often the last step before legal action.

When to send it

Send it after informal reminders have failed and a clear obligation remains unmet. It marks the official start of a deadline and, for debts, the point from which late-payment interest can run. Keep it as evidence if you later go to court.

What you need to know

Always send it as a registered letter with acknowledgement of receipt — proof of receipt is essential if the matter goes to court.
State clearly what you demand, the legal or contractual basis, and a firm deadline (commonly 8 to 15 days).
Use the words 'mise en demeure' and warn that you reserve the right to take legal action.
Attach copies (never originals) of supporting documents such as invoices or the contract.

How to send it

Send by registered letter with acknowledgement of receipt. The AR is what gives a formal notice its legal weight, and MaisonMail posts it with that proof for you.

Letter template

[Your name]
[Your address]
[Postcode, City]

[Recipient name]
[Recipient address]
[Recipient postcode, City]

[City], [Date]

Subject: Formal notice — [SUBJECT OF DISPUTE]

Dear Sir/Madam,

Despite my friendly reminders dated [DATE(S) OF REMINDER(S)], you have still not [OBLIGATION: paid the sum of £X / performed the service / returned the item].

By this letter I formally require you to [PRECISE OBLIGATION] within eight (8) days of receipt of this letter.

Should no satisfactory response be received within this period, I will be compelled to pursue the legal remedies available to me, including [INTENDED RECOURSE: court proceedings / enforcement of warranty / etc.].

Yours faithfully,

[Signature]
[First name Last name]

Send a formal notice

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These templates are provided for guidance only. Adapt them to your situation and verify the legal requirements applicable to your procedure.

What you need to know

Always send it as a registered letter with acknowledgement of receipt — proof of receipt is essential if the matter goes to court.

State clearly what you demand, the legal or contractual basis, and a firm deadline (commonly 8 to 15 days).

Use the words 'mise en demeure' and warn that you reserve the right to take legal action.

Attach copies (never originals) of supporting documents such as invoices or the contract.

Letter template

[Your name]
[Your address]
[Postcode, City]

[Recipient name]
[Recipient address]
[Recipient postcode, City]

[City], [Date]

Subject: Formal notice — [SUBJECT OF DISPUTE]

Dear Sir/Madam,

Despite my friendly reminders dated [DATE(S) OF REMINDER(S)], you have still not [OBLIGATION: paid the sum of £X / performed the service / returned the item].

By this letter I formally require you to [PRECISE OBLIGATION] within eight (8) days of receipt of this letter.

Should no satisfactory response be received within this period, I will be compelled to pursue the legal remedies available to me, including [INTENDED RECOURSE: court proceedings / enforcement of warranty / etc.].

Yours faithfully,

[Signature]
[First name Last name]