How the name check works
Our checker searches the live Companies House register as you type. It shows whether a company already uses your name, or a name that would be treated as the same. The check is free and you do not need an account.
A green result means no identical name was found. Companies House still makes the final decision when it reviews your application, so we check the name again before we file.
The "same as" rules
Companies House will not register a name that is the same as an existing one. Some differences do not count, so these names would be treated as the same:
- Punctuation and symbols — "Green-Leaf Ltd" and "Green Leaf Ltd"
- Capital letters and spacing — "GREENLEAF Ltd" and "Green Leaf Ltd"
- Common words such as "UK", "Group", "Services" or "Holdings" added to an existing name — "Green Leaf UK Ltd" may be treated as the same as "Green Leaf Ltd"
- Words and symbols that mean the same — "and" and "&", "plus" and "+"
- The ending — "Green Leaf Ltd" and "Green Leaf Limited" are the same name
Sometimes a name like this can still be registered, for example if both companies are in the same group and the existing company agrees in writing.
A name that is not identical but is "too like" another company's name can be challenged after registration. If someone complains and Companies House agrees, you may be told to change it.
Sensitive words that need approval
Some words and expressions need permission before you can use them. These include words that suggest:
- A connection with the government, the Crown or a public authority — such as "Royal", "British", "National" or "Council"
- A special status or function — such as "Association", "Charity", "Trust", "Institute" or "University"
- A regulated profession — such as "Chartered", "Accountant" or "Solicitor"
Depending on the word, you may need to explain why you want it, or get a letter of non-objection from a relevant body. This adds time to your application. Our checker flags common sensitive words, and we will tell you what is needed before we file.
Names that will be refused
Companies House will refuse names that are offensive, that would be likely to commit a criminal offence, or that could mislead the public — for example, a name suggesting the company does something it is not legally allowed to do. Names over 160 characters are also not allowed.
Ending your name with "Limited" or "Ltd"
A private company limited by shares must end its name with "Limited" or "Ltd". Both are legally the same, so you can use either on your documents and website. A public company ends with "Public Limited Company" or "PLC", and an LLP ends with "Limited Liability Partnership" or "LLP".
If your registered office is in Wales, you can use the Welsh ending "Cyfyngedig" or "Cyf" instead.
Tips for choosing a good name
- Keep it short and easy to spell, especially if you will say it on the phone.
- Check that a matching domain name and social media handles are free.
- Avoid names that are very close to a well-known brand, even if Companies House accepts them.
- Think about where you will trade. A name that works in English should not mean something unfortunate in another language.
- Choose a name that will still fit if your business grows into new areas.
Trademarks are a separate check
Registering a company name does not give you a trademark, and a free company name does not mean you can trade under it. Someone else may already own a trademark for the same or a similar name. Search the UK Intellectual Property Office (UK IPO) trademark register before you commit, and get advice from a trademark attorney if you are unsure.
Ready to register?
When your name is free, choose a package. The Digital Package costs £290 including the £100 Companies House fee, or compare packages to see all options.