Choosing a company name that passes Companies House first time.
A senior advisor's guide to the rules, edge cases and quiet risks behind the single most important early decision your UK company will make.
Choosing a UK company name looks like the easiest part of incorporation. In practice, it is the step where founders lose the most time — and, later, the most money. A name that clears Companies House on the first attempt is not simply an available string of letters. It is a name that satisfies the statutory rules, avoids sensitive-word approvals you did not budget for, does not clash with an existing trade mark, and gives the underlying brand room to grow into banks, payment processors and international markets. This guide walks through all of that from the perspective of an advisory firm that files new UK companies every working day.
- There is no name reservation in the UK — a name is only secured on incorporation.
- 'Same as' and 'too like' rules ignore filler words, spacing and punctuation.
- Sensitive and regulated words often need written evidence from a named body before filing.
- Companies House clearance is not trade mark clearance — you need both.
- A strong name survives sector pivots, banking underwriting and international expansion.
- Domains, social handles and register status should be checked in parallel, not sequentially.
Every week, we speak with founders who spent weeks on branding, secured a domain, printed early collateral — and then found out at the point of incorporation that Companies House would not accept the name. In every case, the problem was avoidable. Not through cleverness, but through a discipline the register itself has published for anyone willing to read it slowly.
This article is that slow read. It exists so that by the time you file, the outcome is not in question. If you are still in the early stages of setting up a UK company, you may also want to read our long-form guide to forming a UK company as a non-resident, which places the name decision inside the wider process.
Why the name still matters in 2026
A registered company name is not marketing. It is a legal identifier attached to every contract you sign, every bank account you open, every invoice you issue and every filing you submit for the rest of the company's life. Changing it later is possible, but it triggers a chain of downstream updates — bank records, payment processor KYC, VAT and PAYE registrations, contracts, domains, invoices — each with its own cost.
Underwriters read the name first
When a bank or payment provider reviews an application, the registered name is the first thing they see. A name that reads as generic, misleading or awkwardly close to a well-known brand creates friction before the human reviewer has read a single line of your business summary. This is the same principle behind our work on business banking assistance — clean upstream inputs make clean downstream approvals.
Search, brand and defensibility follow the name
The name determines whether your domains, handles, trade mark application and Google presence can meaningfully cohere. A weak name compounds cost across every one of those channels. A strong name compounds value.
The rules Companies House actually applies
The Companies Act 2006 and the associated Company, Limited Liability Partnership and Business (Names and Trading Disclosures) Regulations 2015 govern what UK company names may and may not contain. The rules are administered by Companies House through its name index. The relevant tests fall into four categories.
- Uniqueness — the name must not be the same as, or in some cases too like, an existing name on the register.
- Legality — the name must not be offensive, must not constitute a criminal offence, and must not falsely imply a connection with government, devolved administrations, public authorities or local government.
- Sensitivity — where the name uses a sensitive or regulated word, appropriate approvals or supporting evidence must be provided before filing.
- Form — the name must use permitted characters, respect the length limit, and end with the correct suffix.
A name is accepted only if it satisfies all four. Founders often focus on the first (is it taken?) and forget the other three, which is exactly where most first-time rejections happen.
'Same as' and 'too like' — the biggest reason names are refused
The most misunderstood test is the 'same as' rule. Founders assume that if the exact string of words does not appear on the register, the name is free. In practice, Companies House normalises names before comparison. It disregards:
- Punctuation and spacing.
- The company type suffix (Limited, Ltd, PLC, LLP, Cyfyngedig).
- Common non-distinctive words such as the, company, services, group, UK, global, international, consulting and similar terms when they add no real distinctiveness.
- Letter substitutions used to imitate an existing name (using @ for a, 0 for o, and so on).
- Certain word rearrangements that produce the same core name.
After that normalisation, if the core distinctive elements match another name on the register, the application is refused as 'same as'. There is no discretion — the rule is mechanical.
The wider 'too like' test
The 'too like' test is broader and, unlike 'same as', it is complaint-led. A newly registered company that is 'too like' an existing one can be challenged within twelve months of incorporation by the earlier name-holder. If the objection succeeds, Companies House can direct a name change. This is not theoretical. Every year, hundreds of newly-formed companies are directed to change their name because they were 'too like' a company that already existed.
How to test your name safely
Run every candidate name through the official Companies House Company Name Availability Checker before anything else. Then repeat the search with the distinctive core alone, removing filler words. If any of those searches return a live match, treat the name as high-risk even if the exact string is technically free.
Sensitive words, regulated words and implied authority
Certain words are treated as sensitive because they imply size, authority, professional qualification or regulated activity. Companies House maintains a published list, updated periodically. The consequences depend on the word.
Category A — words that require prior approval
Words that suggest official standing (royal, British, European, national, Great Britain) generally require prior written approval from a named authority — typically a government department. You must obtain and submit that approval evidence before the name is filed. Approval is not automatic.
Category B — words tied to regulated professions or sectors
Words like bank, banking, insurance, reinsurance, trust, chartered, architect, university, pharmacy, midwife and dozens of others require confirmation from the relevant regulator (PRA, FCA, Solicitors Regulation Authority, Office for Students, and others) that the company is entitled to use the term. A company cannot call itself a bank simply because it wishes to be one; the term is protected by statute and by the regulator.
Category C — words that require justification
Words such as group, holdings, international, institute and federation can be used, but Companies House expects the name-holder to be able to justify the term if challenged. Group, for example, typically requires the company to have at least one subsidiary. Using it prematurely can lead to a later direction to change the name.
Implied connections with government or authority
Even without a sensitive word, a name that gives the impression of an official or governmental link — HMRC Compliance Solutions, Companies House Filing Services, UK Trade Registry — will be refused or later directed to change. The test is impression, not intent.
Structure, endings and permitted characters
The structural rules are the ones most easily overlooked because they feel administrative. They are also the easiest to fix before filing, so there is no reason to trip on them.
Suffix rules
- Private companies limited by shares must end with Limited or Ltd.
- Public limited companies must end with Public Limited Company or PLC.
- Companies registered in Wales may use the Welsh equivalents (Cyfyngedig / Cyf or Cwmni Cyfyngedig Cyhoeddus / CCC).
- LLPs must end with Limited Liability Partnership or LLP.
Characters and length
- Letters A–Z, digits 0–9 and a limited set of symbols and punctuation (comma, full stop, hyphen, brackets, ampersand and a small number of others).
- Maximum 160 characters including the ending.
- No emojis, currency symbols, or non-Latin scripts.
Style choices that quietly cost you
All-caps names still appear on the register in mixed case for comparison purposes; formatting cannot be relied on to differentiate you from another registration. Names built entirely from numbers or initials pass technically but perform poorly in underwriting, search and payments risk models — a real cost that never shows up until it is too late to change cheaply.
Trade marks: the check every founder underestimates
Companies House and the Intellectual Property Office (IPO) are different registers governed by different laws. Clearing the company name at Companies House does not mean the trade mark is free. This is the single most expensive mistake we see in the first six months of a company's life.
The Trade Marks Act 1994 protects registered marks in specified classes of goods and services. A company can be trading legally under its registered name and still face a trade mark infringement claim from an earlier rights-holder. In those cases, the company usually has to change its name, its branding, its domain and its handles — with everything already printed, coded and indexed.
The three checks to run
- UK trade marks register — via the IPO's online search, in the classes most relevant to your activity.
- EU trade marks (EUIPO) — for companies with any European ambition, this catches marks that would block use on the continent.
- Google 'brand' search — a common-sense check for well-known unregistered marks that may still hold common-law rights.
When the name-plus-trade-mark position is genuinely clean, you have a defensible brand. When it is not, you have a project timer you cannot see counting down.
Choosing a name that works commercially, not just legally
A name that clears Companies House and the trade mark register can still fail commercially. As advisors, we test candidate names against a small number of pragmatic filters.
Bank and payment credibility
Names that resemble consumer finance products, imply lending or crypto activity, or read as generic "solutions" companies attract more scrutiny in underwriting. If the sector is already regulator-sensitive — payments, remittance, education, health — the name should be understated, not clever.
Sector portability
Most founders pivot at least once. A name that describes the exact first product ("Bright Invoicing Ltd") ages badly. A name built around identity or association ("Bright & Co Ltd") pivots without being renamed. Think in decades, not launches.
International pronounceability
If your customer base is international — and for most non-resident founders it is — the name should be pronounceable in English by a non-native speaker without embarrassment. This sounds trivial until a client cannot say the name of the supplier they use.
Domain and handle availability
A name whose .com and .co.uk domains are both taken by active businesses is a warning, not a challenge. Domains and social handles should be treated as part of the name search, not a downstream afterthought.
Our pre-flight check — what we do before we file
Run the exact name and its distinctive core through the official checker. Flag anything active or dissolved within twenty years.
Strip filler words, punctuation and endings. Search again. This surfaces the 'same as' collisions the raw search hides.
Check every word in the name against the current Companies House sensitive words list. Note any required approvals before we quote a timeline.
Read the name as a stranger would. Would any phrase suggest a government, royal, professional or regulated body connection?
Confirm the ending, character set and length. Reject or reformat non-compliant candidates before they reach the client.
Search UK and EU trade marks in the client's likely classes. Flag identical, phonetic and conceptual matches.
Confirm the .com, .co.uk and primary social handles are usable — or that there is a viable alternative.
Ask: does the name help or hurt a banking application? Founders in sensitive sectors get an explicit second opinion.
We never file with a single candidate. A short list of two to three fully-cleared names sits ready for the moment of filing.
The final name choice is documented alongside the reasoning, so the client has a clean record if anyone ever asks.
A name that clears these ten checks is not just legally accepted — it is commercially defensible, bank-ready and durable. When we handle formation for a client, this pre-flight is the reason our first-time acceptance rate at Companies House is what it is. It costs nothing to run. It saves everything downstream.
Common mistakes we see every week
Using words like 'group', 'international' or 'chartered' without evidence — the filing is rejected and precious days are lost.
The exact string is free, but the normalised distinctive core clashes with an existing name. Rejected on 'same as'.
The company forms, branding is printed, and a cease-and-desist arrives ninety days later. Every asset has to be redone.
The first product changes within eighteen months and the name no longer describes what the company does.
Substituting numbers or symbols to dodge a 'same as' match. Companies House normalises those substitutions and refuses the name anyway.
A name whose primary domains are held by an active business creates a permanent ceiling on how visible the brand can become.
After the name is registered — protecting it properly
Once the name is on the Companies House register, three follow-on steps protect it. None are legally required. All are quietly expected in professional practice.
Register the trade mark
A UK trade mark registration in the correct classes is the only way to convert a name into a defensible asset. Companies House registration alone gives you no exclusive right to trade under that name — it merely gives you a legal entity called by it.
Secure the surrounding identifiers
Domains, social handles, professional emails and marketplace accounts should be secured in the same week as incorporation. Waiting even a month invites cyber-squatters and confused-brand registrations.
Use the name correctly on documents
The full registered name must appear on business letters, order forms, invoices, websites and email footers, together with the registered office address and company number. This is a statutory disclosure requirement, and the fines for non-compliance are low but the reputational cost of getting it wrong on a contract is not.
Where the address details live
The registered office and director service address that appear alongside the name are themselves worth planning carefully. Our guides to Registered Office Address and Director Service Address cover those decisions in detail.
Frequently asked questions
Why do Companies House reject a company name?+
Most rejections fall into three groups: the name is 'same as' or 'too like' a name already on the register, it contains a sensitive or restricted word without the required supporting evidence, or it implies a connection with government, royalty or a regulated profession. A smaller number are rejected on punctuation, characters or length.
Do I need to reserve a company name before I incorporate?+
No. There is no formal name reservation in the UK. A name is only secured the moment the company is incorporated and appears on the Companies House register. Until then, it remains available to anyone else who files first.
Can I use the same name as another company if I add or remove a word?+
Not reliably. Companies House disregards common punctuation, spacing and 'non-distinctive' additions such as 'the', 'company', 'services', 'group' or 'UK'. 'Bright Consulting Ltd' and 'The Bright Consulting Company Ltd' can be treated as the 'same as' one another and be refused.
Are certain words banned or restricted?+
Yes. A published list of sensitive words and expressions requires prior approval, often from a named regulator or government body. Examples include 'bank', 'insurance', 'trust', 'chartered', 'royal', 'British', 'university' and 'group'. Some are outright prohibited without a licence; others simply need supporting evidence.
Does 'Limited' or 'Ltd' need to be part of my name?+
Yes. A private company limited by shares must end its registered name with 'Limited' or the abbreviation 'Ltd'. Welsh companies may use 'Cyfyngedig' or 'Cyf'. This ending forms part of the legal name but is disregarded when Companies House compares two names for similarity.
How is a registered company name different from a trading name?+
The registered name is the legal identity of the company at Companies House. A trading name is a commercial label used by the company for marketing or invoicing. A trading name does not have to be registered separately but it must not infringe another party's trade mark and must appear alongside the legal name on formal documents.
Should I check trade marks as well as Companies House?+
Yes, and this is where most first-time founders under-invest. Companies House and the Intellectual Property Office are separate registries. Clearing Companies House does not clear the trade mark position, and vice versa. A serious brand check looks at both.
Can Companies House force me to change my name after incorporation?+
Yes. Under the Company Names Adjudicator process and various statutory powers, a company can be directed to change its name if it is misleading, too like an existing name, or was chosen to take advantage of another party's goodwill. Getting the name right at the start avoids this.
What characters and punctuation are allowed in a UK company name?+
You may use letters A–Z, digits 0–9 and a limited set of punctuation and symbols (comma, full stop, hyphen, brackets and a few others). The name must be no more than 160 characters including its ending. Emojis, currency symbols and most non-Latin characters are not accepted.
How long does it take Companies House to decide on a name?+
For a straightforward name that meets the rules and does not use sensitive words, the decision is effectively instantaneous — approval is confirmed as part of the incorporation filing itself. Names that trigger sensitive-word or supporting-evidence checks can take several working days.
Can a non-UK resident register any UK company name?+
The rules on names apply equally to residents and non-residents. Your country of residence does not restrict the names you can register. However, non-residents should also consider whether the name is available in their home jurisdiction and their target markets before committing.
What if my perfect name is 'too like' an existing one — is there any flexibility?+
Sometimes. If the existing company gives written consent, Companies House can permit an otherwise 'too like' name. Consent letters must be on the existing company's letterhead, signed by a director, and confirm no objection. This is a legitimate but slow route and depends entirely on that company's willingness.
How do I actually check a name before filing?+
Start with the official Companies House Company Name Availability Checker, then cross-check the trade marks register, common social handles and the .co.uk and .com domains. A name that clears all four is the strongest candidate for a serious brand.
A name that passes first time is a name you never think about again.
Every rejected filing costs time, patience and, occasionally, momentum a founder never fully recovers. Every accepted filing becomes invisible — the name simply works, quietly, on every document the company signs for the rest of its life. That is the goal: not a clever name, not a lucky name, but a name chosen with enough discipline that it disappears into the background of a functioning business.
If you would like a senior advisor to run the pre-flight check on a shortlist of candidate names before you file, that is exactly the sort of conversation we have most days of the week.
UK Company Experts is a trading name of Seven Oak Prestige Ltd, a London-based advisory firm supporting international entrepreneurs through UK company formation, banking preparation and post-incorporation compliance. Articles are written by our editorial team and reviewed by a senior advisor before publication.
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