Most business owners encounter their certificate of incorporation companies house document on the day they register, file it somewhere safe, and never think about it again. That is a mistake — because this document underpins almost everything that follows, from opening a business bank account to signing contracts and running paid advertising campaigns.
This article explains exactly what a certificate of incorporation companies house document is, what information it contains, why it matters for your business operations, and what to do if you need to find or replace yours.
What Is a Certificate of Incorporation Companies House?
A certificate of incorporation companies house document is the legal proof that your company exists. It is issued by Companies House — the UK's registrar of companies — the moment your company is successfully registered. Without it, your business has no legal identity under UK law.
The certificate itself contains four pieces of critical information: your company name, your company registration number (CRN), the date of incorporation, and the type of company (most commonly a private company limited by shares). These four data points are referenced throughout the life of your business, from HMRC filings to supplier agreements.
One point worth understanding clearly: the certificate of incorporation is not a licence to trade. It confirms legal existence, not regulatory approval to operate in any specific industry. If your sector requires additional licences — financial services, food production, healthcare — those are entirely separate obligations.
For anyone starting out, the Google Pay Per Click Management guide for SMEs covers another early decision most new limited companies face: how to start advertising once the paperwork is done.
How to Get Your Certificate of Incorporation from Companies House
If you registered your company online through the Companies House web incorporation service, your certificate of incorporation companies house document was issued digitally, usually within 24 hours of registration being approved. You should have received it by email as a PDF. That digital document carries the same legal weight as any paper version.
If you incorporated through an agent, an accountant, or a formation company, they may have received it on your behalf and should have forwarded a copy to you. If they did not, ask for it directly — you are entitled to it.
For companies incorporated before the digital era, the original certificate would have been posted. If yours is lost, you can download a certified copy from the Companies House online register at no cost. Simply search for your company name or registration number on the Companies House register and download the incorporation document from the filing history.
The practical point most formation guides skip: your company registration number on that certificate is permanently yours. It never changes, even if you change your company name. Keep the CRN somewhere obvious — you will use it constantly.
What the Document Actually Contains
The certificate of incorporation companies house document is deliberately brief. It is not a lengthy legal contract. Most certificates are a single page, sometimes less.
Here is what the document includes and why each element matters:
| Element | What It Is | Why It Matters |
|---|---|---|
| Company name | Your registered legal name | Must match all contracts, invoices, and filings |
| Company number | Your unique registration number (CRN) | Required for bank accounts, tax, and advertising accounts |
| Date of incorporation | The exact date Companies House confirmed registration | Relevant for legal agreements and financial history |
| Company type | e.g. Private Limited by Shares | Determines your legal obligations and liability structure |
| Registered office | Your official address at time of incorporation | The address HMRC and Companies House use to contact you |
One thing that catches people out: the registered office on the original certificate may have changed since incorporation. Companies House records the address at the point of registration. Any subsequent changes are filed separately. Your current registered office is always viewable in your live Companies House record, not necessarily on the original certificate.
Why It Matters Beyond the Day You Register
Having spent nine years running a marketing agency, we saw the certificate of incorporation companies house document come up in contexts that clients had not anticipated. It was rarely needed in the first month. It came up constantly in the first few years.
Business bank accounts almost universally request it during onboarding. Many banks, particularly challenger banks, will accept the company registration number and cross-reference with the Companies House API — but traditional banks typically want to see the document itself. If you are applying for a business account and cannot locate your certificate, you will face delays.
Venture funding and investment due diligence almost always includes verification against the certificate. Any discrepancy between your trading name and your registered company name will need explaining at that point, which is easier to sort before negotiations begin.
Google Ads verification is another practical context. If you are running Google Ads as a limited company and your account gets flagged for identity verification, Companies House documents including your CRN are typically what Google's support team will request. Understanding how much Google Ads costs for SMEs is one question — but getting your account verified and compliant is the prerequisite.
Contracts and supplier agreements are a third area. When you sign commercial contracts, your company's legal name and registration number should appear in the agreement. The certificate is the document that confirms those details are correct.
Replacing or Reissuing a Lost Certificate
This is one of the most searched questions related to certificate of incorporation companies house, and the answer is simpler than most people expect.
You cannot get a reissue of your original certificate from Companies House — what you can do is download a certified copy of the incorporation document directly from your company's filing history on the Companies House website. This is free, available immediately, and carries full legal standing. There is no fee and no application form required.
If you need a physically certified paper copy for a specific legal or banking purpose, you can order a certified copy from Companies House for a small administrative fee. As of 2026, this process is handled through the Companies House document ordering service. Turnaround is typically a few working days.
The one scenario where replacement gets more complex is if your company name has changed since incorporation. Your original certificate will show the name you incorporated under. The name change is recorded in separate filings — a certificate of incorporation on change of name — which Companies House also issues. You may need both documents if your current trading history spans both names.
For businesses managing Google Ads alongside these administrative tasks, understanding how to advertise your business with Google Ads and keeping your account details aligned with your registered company information avoids verification headaches later.
Certificates of Incorporation and Your Google Ads Account
This connection is less obvious but genuinely relevant for SME owners. When you set up Google Ads as a limited company, you are operating as a legal entity — not as an individual. Google's advertiser verification programme, which has expanded significantly in recent years, requires businesses in certain categories to confirm their legal identity.
If your Google Ads account is reviewed or flagged, the details on your certificate of incorporation companies house document — specifically your company name and CRN — are what you will use to verify your identity with Google. Any mismatch between your Ads account name and your registered company name can create friction.
This is also relevant if you use an AI agent to manage your Google Ads account on your behalf. Overtime manages Google Ads for SMEs by logging into accounts directly, adjusting bids, pausing underperforming keywords, and reallocating budget based on performance — all of which requires the account itself to be properly set up and verified in the first place. A certificate of incorporation discrepancy that prevents proper account verification will create problems upstream of any optimisation work.
For businesses thinking about their broader advertising setup, understanding the difference between managing ads manually versus using an AI agent is covered in detail in the Pay Per Click Software vs AI Agent guide.
How to Use Your Certificate of Incorporation Correctly
A few practical points that rarely appear in standard guides on this topic.
Do not alter the document in any way. It sounds obvious, but adding logos, changing formatting, or annotating the PDF can raise questions about authenticity when you submit it to third parties. Use the original or a clean certified copy.
Store it in two places: a physical copy in a secure location and a digital copy in a cloud storage system that is not tied to a single device. If your laptop is stolen or a hard drive fails, you want access to this document without delay.
If your company name has changed, keep the original certificate alongside all subsequent change-of-name certificates. The history of your company name changes is part of your legal record.
For any business running Google Ads, having your company registration details readily accessible will make verification, billing, and account management significantly smoother. It is also worth reviewing what a Google Ads expert actually does to understand how account structure and legal compliance interact in practice.
The certificate of incorporation companies house document is a single page, but it is the foundation your entire legal and commercial operation sits on. Keep it accessible, keep it clean, and know where to find it.
If you are at the stage of running Google Ads and want those campaigns managed without the time cost of doing it yourself, Overtime's pricing is worth reviewing — it is built specifically for SMEs who need active account management rather than a set-and-forget approach.
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Frequently Asked Questions
How do I get a copy of my certificate of incorporation from Companies House?
Search for your company on the Companies House register using your company name or registration number, then download the incorporation document from the filing history tab. This is free and the digital copy carries full legal standing.
What is the company registration number on a certificate of incorporation?
The company registration number (CRN) is a unique eight-digit identifier assigned to your company by Companies House at the point of incorporation. It never changes, even if you change your company name, and is required for tax filings, bank accounts, and many commercial agreements.
Can I replace a lost certificate of incorporation?
You cannot get an identical reissue, but you can download a certified copy of your incorporation document directly from the Companies House website at no cost. For a physical certified copy, Companies House offers a document ordering service for a small fee.
Why does Companies House ask for a certificate of incorporation?
Companies House does not typically ask for your own certificate back — it issues it. Third parties such as banks, solicitors, and investors may request it to verify your company's legal existence, registration number, and date of incorporation before entering into agreements with you.
For more on this, see our guide: Where to Find Your Company Registration Number.
Do I need my certificate of incorporation to run Google Ads?
Not directly, but if your Google Ads account is flagged for advertiser verification, your company registration number and legal name — both found on your certificate of incorporation companies house document — are the details Google will use to confirm your identity. Having them readily accessible avoids delays. See how Google Ads management works for ecommerce businesses for more on account setup best practices.