In the UK, a company only becomes legally formed once Companies House issues a certificate of incorporation. A letter is correspondence — useful for requesting help, authorising someone to act, or explaining a situation to a bank or landlord — but it isn't a substitute for that process.
Getting it right still matters. The wrong recipient, an inaccurate company number, or a tone that's too casual can delay whatever you're asking for. This guide covers when to use a registration letter, what it must include, a practical template, common mistakes, and when you need official Companies House evidence instead.
Key Takeaways
- State your purpose, company details, and the exact action you want from the recipient
- Only the Companies House certificate of incorporation registers a company, not a letter
- Include legal name, registered office, company number (if issued), signatory details, and attachments
- Send an official Companies House certificate when formal proof is required, not a self-written letter
- Seek professional advice for overseas companies, regulated sectors, or complex ownership structures
How to Write a Company Registration Letter in the UK
Whether you're writing to a bank, a formation agent, or Companies House itself, the same four-step structure works.
Step 1: Confirm the Purpose and Recipient
Before drafting anything, decide exactly what you need. Are you:
- Requesting incorporation assistance from a formation agent or accountant
- Supporting a Companies House submission with extra context
- Authorising a representative to act on the company's behalf
- Notifying a bank or stakeholder that incorporation is complete
- Confirming company details after registration
Address the letter to a named person or organisation, not a vague heading like "To Whom It May Concern." Your subject line should do the heavy lifting: state the action, the company name (proposed or registered), and the company number if one exists.
Step 2: Add the Sender and Company Details
Put the basics at the top: your name, job title or capacity, correspondence address, phone number, email, and the date.
Then get the company details right:
- Use the full legal name, including "Limited," "Ltd," "LLP," or "plc" (not just a trading name)
- Add the registered office address and company number for an existing company
- Label everything as "proposed" if incorporation hasn't happened yet
Companies House routinely returns paper filings with an incorrect number or an impermissible name variation, so cross-check every detail against the public register first.
Step 3: Explain the Registration Request Clearly
Open with one sentence: who you are, which company or proposed entity is involved, and why you're writing. Don't bury this in three paragraphs.
Mention the business structure (private company limited by shares, LLP, or overseas establishment) only where relevant. Then state exactly what you need: registration assistance, confirmation of next steps, acceptance of an enclosed document, or guidance on a filing. If directors, members, or a parent company matter here, name their role and skip unnecessary personal detail.
Step 4: List Documents, Close Formally, and Review
Finish with three things:
- List attachments precisely - identity documents, authority letters, address evidence, constitutional documents, or an official Companies House form
- State the next step - confirmation, a document review, a fee estimate, or a note on anything missing
- Sign off correctly - "Yours sincerely" for a named recipient, "Yours faithfully" after "Dear Sir/Madam," followed by your full name, title, and authority to act
Proofread every company name, address, number, date, and email before sending. One transposed digit in a company number can send the whole request back to square one.
A simple template to adapt:
To: [Recipient name or organisation], [address or email] Subject: Request regarding the registration of [proposed or registered company name], [company number if applicable]
Dear [Name / Sir or Madam],
I am writing in my capacity as [role] regarding [company name and proposed action]. Please confirm [specific request]. The relevant documents enclosed are [list].
Yours [sincerely/faithfully], [Name, title, contact details]
What to Prepare and When to Use the Letter
What you prepare depends entirely on one question: has the company already been incorporated?
Before Incorporation
Prepare these details before you draft:
- Proposed company name options
- Intended entity type and business activity
- Proposed registered office
- Initial director or member details
- Confirmation of who's authorised to make the request
Use careful wording. Say "proposed company" and "intended registration," not "our company," until Companies House has accepted the application. A proposed name isn't reserved, and Companies House confirms incorporation only takes legal effect once the certificate of incorporation is issued. That certificate is conclusive evidence of registration under the Companies Act 2006 — no letter can replace it.
After Incorporation
Check the legal name, company number, incorporation date, registered office, officer details, and status against the Companies House register before referencing them. It takes two minutes and prevents an awkward correction later.
Once verified, use the letter to notify banks, suppliers, investors, landlords, or advisers, and to explain whatever's attached.
Supporting Documents and Authority
Ask the recipient what they actually need before assuming a letter alone will suffice. Common requirements include:
- A certificate of incorporation or certified Companies House document
- A board resolution or letter of authority
- Identification and proof of address
- Constitutional documents (memorandum and articles)
Only send confidential personal data where it's genuinely necessary, and use a secure channel to do it.
When Should You Use a Company Registration Letter?
The right format depends on the action, not just the fact that a company's involved.
A letter works well when you're:
- Requesting incorporation support from a professional adviser
- Accompanying a Companies House filing with extra context
- Authorising an agent to act for the company
- Notifying a bank of a newly incorporated company
- Explaining a change in company details to a stakeholder
A letter is the wrong tool when you're:
- Claiming a company is incorporated before Companies House confirms it
- Trying to replace a required online filing
Overseas founders face extra steps. An overseas company opening a UK branch must register a UK establishment separately using form OS IN01, within one month of opening. That route differs from incorporating a new UK company and often needs certified translations of constitutional documents.
The same letter discipline still matters after incorporation, especially when a UK company expands overseas and needs clear covering notes with local filings. VJM Global supports UK businesses setting up in India, where a registration letter is usually one piece of a wider onboarding and compliance file rather than a standalone document.
Common Mistakes and Troubleshooting
Even experienced writers trip over the same handful of issues:
- Vague purpose or subject line - "Company Registration Request" tells the reader nothing. Name the company, the entity type if relevant, and the exact action requested.
- Confusing identifiers - Don't confuse a Companies House company number with a 10-digit UTR from HMRC for Corporation Tax, or with a VAT number, PAYE reference, or authentication code.
- Wrong legal name or address - Match the public Companies House record exactly, including punctuation and the company number.
- Claiming registration too early - Swap "our registered company" for "proposed company" until the certificate is in hand.
- Missing authority or attachments - Confirm the signatory is authorised, and check that every document mentioned is actually attached and legible.
- Sending the wrong evidence - If a bank or investor asks for formal proof, send the certificate or certified document, not just the letter.
- No response or a rejected request - Verify you've used the right recipient and channel, ask what's missing, and check current guidance before resending.
Alternatives to a Company Registration Letter
Sometimes a letter simply isn't the right tool.
| Alternative | Best used when | Trade-off |
|---|---|---|
| Certificate of incorporation / official Companies House record | Recipient needs proof the company exists | Verifies registration but doesn't explain context or authority |
| Companies House filing (IN01, LL IN01, OS IN01, confirmation statement) | You need to create or legally update registered information | Legally operative, but doesn't provide background or instructions |
| Professional review (accountant, solicitor, formation specialist, cross-border adviser) | Ownership is complex, directors are overseas, or the sector is regulated | Adds cost, but reduces errors and delays |
A letter and one of these alternatives often work together rather than replacing each other. A covering letter explaining a bank account application, for instance, still needs the certificate of incorporation attached to actually satisfy the bank.
Conclusion
A strong UK company registration letter does three things well: it names the right recipient, states one clear purpose, and backs up its request with accurate legal details and the right attachments.
The letter itself does not register a company. Registration happens at Companies House through the appropriate filing, when the certificate of incorporation is issued.
Before sending anything, double-check every detail against the public register, and confirm whether the recipient needs a letter, a statutory filing, or an official Companies House document. Getting that distinction right the first time saves a second round of correspondence.
Frequently Asked Questions
How can I obtain proof of my company registration in the UK?
Order a certificate of incorporation or a certified document from Companies House. A self-written letter can explain your situation, but it isn't official proof of registration.
What is a Certificate of Registration in the UK?
People often use this phrase loosely, but the correct legal term is a certificate of incorporation, the document Companies House issues once a company is formally registered.
Does a company registration letter register a company in the UK?
No. A letter supports or explains a request. Incorporation only happens through the correct Companies House application and official confirmation.
What information should I include in a UK company registration letter?
Cover the purpose, legal company name, registered or proposed office address, company number (if issued), your authority to write, contact details, the requested action, and a list of attachments.
Who should I address a company registration letter to?
It depends entirely on the purpose: Companies House, a formation agent, accountant, bank, landlord, investor, or another named organisation.
Do I need professional help to write a company registration letter?
A straightforward letter can be handled independently. Get professional input for overseas founders, complex ownership, regulated industries, or anything spanning multiple jurisdictions.
