A domain name is an internet address, a registered company name identifies a company at Companies House, and a trade mark can protect a brand for specified goods or services. They are separate systems. An available .co.uk domain is not proof that a proposed business name is legally clear, and registering a company does not automatically reserve its matching domain.
Before you begin
- The intended customer-facing brand and the legal owner of the domain.
- A Companies House name check if forming or renaming a limited company.
- A search for relevant existing trade marks and similar brand names.
- Domain availability, social handles and a budget for ongoing domain renewal.
Three registrations answer different questions
A domain search asks whether a particular internet name can currently be registered. Companies House applies company-name rules as part of the company registration system. The UK Intellectual Property Office handles trade marks. A result in one system does not replace a check in the others.
Keep those checks separate in your launch notes. Record the exact spelling, the system searched and the result, rather than writing only that the name is available. The business may trade under one name, have a different registered company name and use a shorter domain, but customers should still understand who operates the website.
| Name | Main purpose | What it does not automatically provide |
|---|---|---|
| Domain name | An internet address you register and renew. | Company registration or trade-mark protection. |
| Company name | The registered name of a legal company. | The matching domain or a trade mark. |
| Trade mark | Brand protection within its applicable scope. | Automatic ownership of every matching internet address. |
Sources: GOV.UK: choosing a limited company name ↗ · Intellectual Property Office: company names, domains and trade marks ↗ · GOV.UK: registering a trade mark ↗
Check company naming rules where they apply
GOV.UK sets out naming requirements for limited companies, including same-name rules and restrictions on certain words. Its guidance also distinguishes registered company names from business or trading names. Follow the rules relevant to the kind of business you are actually setting up.
Do the check before ordering a sign, vehicle graphics or a large print run. If a name needs permission or could conflict with another business, resolve that issue before treating a domain purchase as the final approval. The domain checkout cannot decide whether your company-name application will succeed.
Sources: GOV.UK: choosing a limited company name ↗ · Business.gov.uk: legal and trading names ↗
Search trade marks as a separate step
The Intellectual Property Office explains that company law and trade-mark law are different. A company name accepted at Companies House is not guaranteed to qualify as a trade mark. Likewise, a registered domain can conflict with someone else’s earlier rights.
Look beyond an exact-match domain search when assessing a brand. Similar names, the goods or services involved and the relevant territory may matter. If the proposed brand raises a conflict or will be central to a significant investment, seek appropriate professional advice before committing. Buying extra domain extensions does not settle a rights dispute.
Sources: Intellectual Property Office: company names, domains and trade marks ↗ · GOV.UK: registering a trade mark ↗
Choose an address that customers can recognise and type
Once the naming checks are in hand, compare the available domain options on practical grounds. Read each candidate aloud, test the spelling and consider how it looks on an email address or printed invoice. An awkward chain of extra words may be harder for customers to remember than a short, clear alternative.
A UK-facing business might consider .co.uk or .uk, while a broader market may make .com worth comparing. Register only the additional names you have a reason to maintain. If another business already uses the exact name, do not assume a different extension removes the naming concern.
Put the domain under the right owner’s control
Decide who should be the registered holder before buying the name. For a company-owned business asset, use the appropriate organisation and contact details rather than leaving it informally with a departing employee or an unrelated designer. Agree who will maintain the account, receive notices and approve changes.
Keep account access secure and document any agreed client handover. Domain ownership records, website editing access and company registration records are different things. A designer can manage a website without needing to become the intended legal holder of the customer’s domain.
Budget for the address after the business launches
The domain has its own registration term and renewal date. Forming a company or registering a trade mark does not pay that renewal for you. Keep a record of the confirmed domain expiry and compare the annual renewal price alongside the opening registration charge.
NameUK’s current affordable UK registration and renewal offer is shown below. Website hosting, mailboxes, company formation and trade-mark applications are separate services. Complete the relevant name checks first, then register the exact available domain you want and keep the confirmation with your business records.
Reviewed against the linked primary guidance on 15 October 2026. Check current provider instructions and extension rules before making changes.
Further readingGOV.UK: choosing a limited company name ↗Intellectual Property Office: company names, domains and trade marks ↗GOV.UK: registering a trade mark ↗Business.gov.uk: legal and trading names ↗Extension rules and provider processes can change. Check the current registrar instructions before a registration, transfer or renewal.
Low-cost registration. Affordable UK renewals.
Register .co.uk for £9.99 for one year, with annual renewal currently £9.99. Or choose a new three-year .co.uk registration for £25.99. Check the selected name and term before payment. Future renewal prices can change.