Registering a limited company in the UK is a process you can complete online in under 30 minutes. Companies House processes most applications within 24 hours, often the same day. The basic steps are simple: choose a name, provide a registered office address, appoint at least one director, and submit the IN01 form with a £12 fee.

But what happens when the name you want is taken? Or worse, what if it's not taken but is so similar to an existing brand that you risk a legal dispute down the line? This is where most online guides stop. They cover the mechanics of registration but not the practical steps to avoid a name that could get you a cease-and-desist letter six months after you start trading.

This guide is for business owners who have a specific name in mind and need to know whether they can use it, how to check for conflicts, and what to do if their first choice is unavailable. I'll walk through the Companies House rules, the trademark angle most people miss, and the steps you can take to register safely.

The Basic Rules for Limited Company Names

Companies House will reject a company name if it is the same as an existing name on the register. "Same" means identical in spelling, punctuation, and word order. "ABC Consulting Ltd" and "ABC Consulting Limited" are treated as the same. "ABC Consulting (London) Ltd" is different because the bracketed location makes it distinct.

The rules also cover "too like" names. If your proposed name is similar to an existing one and could mislead the public, Companies House may reject it after incorporation if someone complains. They do not pre-screen for similarity at the point of registration. The system only checks for exact matches.

This is the first trap. You can register a name that is very close to an existing company, and it will go through. But the existing company can object later, and Companies House can direct you to change it. That means reprinting stationery, updating your bank, notifying clients, and filing a change of name with Companies House at a cost of £10 plus administrative hassle.

Trademarks: The Overlooked Risk

The Companies House register is not the same as the UK Intellectual Property Office (IPO) trademark register. A company can be registered at Companies House with a name that infringes an existing trademark. The trademark holder can then take legal action for passing off or trademark infringement, even if Companies House approved the name.

This is not a theoretical risk. A sole trader running a digital marketing agency in Manchester registered "PixelPerfect Marketing Ltd" at Companies House. Six months later, a larger agency in London with a registered trademark for "PixelPerfect" sent a legal letter. The smaller business had to rebrand at significant cost.

Before you submit your IN01 form, check both registers. The IPO has a free online search tool at gov.uk/search-for-trademark. Search for your proposed name and any close variations. Look for trademarks in your sector and in related sectors. Trademarks are registered by class, so a trademark in class 35 (advertising and business services) could block a consultancy just as easily as one in class 42 (software and IT services).

How to Check Name Availability Before You Register

Start with the Companies House name availability checker on their website. Enter your proposed name exactly as you plan to register it. The system will tell you if it matches an existing name. If it does not, that is the first green light.

Next, search the IPO trademark database. Use the same name and close variations. Also search for the core word without any suffix like "Consulting", "Services", or "Ltd". A trademark for "Redwood" could block "Redwood Consulting Ltd" even though the words are not identical.

Then do a general web search. Look for unregistered trading names, business names registered with local councils, and domain names. Even without a registered trademark, a business that has been trading under a name for years can bring a passing-off claim if your use of a similar name damages their goodwill. Passing off is harder to prove than trademark infringement, but it is still a risk worth avoiding.

What to Do If Your Preferred Name Is Taken

If the exact name is taken, you have a few options. The simplest is to add a distinguishing word or location. "ABC Consulting (Birmingham) Ltd" is different from "ABC Consulting Ltd" and will be accepted by Companies House. You can also use a different word order, add your surname, or use an acronym.

If the name is not taken but is very similar to an existing company, you can still register it. But you should document why you chose it and be ready to defend it if challenged. If the existing company is in a completely different sector, the risk of confusion is lower. A "Swift Logistics Ltd" is unlikely to be confused with "Swift Hairdressing Ltd". But if both are in services, the risk rises.

Another option is to register the name as a trademark yourself before incorporating. This gives you priority and makes it harder for anyone else to challenge your use of the name. The cost is around £170 plus VAT for one class via the IPO online system. For most small businesses, one class is enough.

If your preferred name is taken as a limited company, you may still be able to use it as a sole trader or partnership. Companies House controls company names, not trading names. A sole trader in Leeds can trade as "Redwood Consulting" even if "Redwood Consulting Ltd" is already registered, as long as they do not hold themselves out as a limited company.

This is a common workaround for contractors and freelancers who want a professional trading name without the limited company structure. But be careful: if the existing company has a registered trademark, using the name as a sole trader still risks infringement. The trademark protection is broader than the Companies House register.

If you are set on the limited company route and your name is taken, consider buying the existing company. This is rare and usually expensive, but it happens. You would need to negotiate with the current director, agree a price, and complete a share purchase. The company keeps its name and its history, which can be useful if it has a good credit record. But you also inherit any liabilities, so due diligence is essential.

The Registration Process Step by Step

Once you have a name that clears both the Companies House and trademark checks, the registration itself is straightforward. You will need:

  • A registered office address in the same part of the UK as your company (England and Wales, Scotland, or Northern Ireland). This can be your home address, but it will be public on the Companies House register. Many accountants, including our firm, offer a registered office service to keep your home address off the public record.
  • At least one director. Directors must be at least 16 years old and not disqualified from being a director. There is no residency requirement for private companies.
  • At least one shareholder. This can be the same person as the director. For a single-person company, you are both director and shareholder.
  • A person with significant control (PSC). This is anyone who owns more than 25% of the shares or controls more than 25% of the voting rights. For most small companies, it is the director-shareholder.
  • A Standard Industrial Classification (SIC) code. This describes your business activity. Choose the one that best matches what you actually do.

Submit the IN01 form online through the Companies House WebFiling service or through an authorised formation agent. The fee is £12 for online filing, £40 for postal. Most people use online because it is faster and cheaper.

You will receive a certificate of incorporation within 24 hours in most cases. This is your company's birth certificate. It shows the company number, date of incorporation, and registered office address. Keep it safe. You will need it to open a business bank account and register for tax.

After Incorporation: What You Must Do Next

Registering the company is only the first step. Within days of incorporation, you need to:

  • Register the company for Corporation Tax with HMRC. You should do this within three months of starting to trade. HMRC will send you a CT41G form (or you can register online). They will also set up your company's tax account and tell you when your first Corporation Tax return is due.
  • Register for VAT if your turnover is expected to exceed £90,000 in the next 30 days. You can also register voluntarily if you want to reclaim VAT on your purchases, even if your turnover is below the threshold.
  • Register for PAYE if you plan to pay yourself or anyone else a salary. Even if you are the only director and take only dividends, you may still want a small salary for National Insurance credits. You can register for PAYE online through HMRC's Basic PAYE Tools or through payroll software like BrightPay or Xero.
  • Set up a business bank account. Most banks require the certificate of incorporation and proof of identity. Some digital banks like Tide, Starling, and Monese offer fast online applications specifically for limited companies.
  • Keep statutory records. Your company must maintain a register of directors, a register of shareholders, a register of PSCs, and a register of directors' residential addresses (not open to public inspection). These can be kept at your registered office or at a single alternative inspection location (SAIL) address.

Common Mistakes to Avoid

The most common mistake is choosing a name without checking the trademark register. A Companies House clearance is not a clearance to trade. You can incorporate a name that infringes a trademark and face legal action months or years later. Always check the IPO database.

Another mistake is using a home address as the registered office without considering privacy. The registered office is public. Anyone can look it up on the Companies House register. If you work from home and do not want clients or competitors knowing your home address, use a registered office service. Many accountants offer this as part of their incorporation package.

A third mistake is failing to file the confirmation statement on time. Every company must file a confirmation statement at least once every 12 months. The fee is £13 online. If you miss the deadline, Companies House will issue a warning, and eventually strike the company off the register. Set a reminder in your calendar as soon as you incorporate.

When to Speak to an Accountant Before Incorporating

Most people can register a limited company without professional help. The online process is designed to be self-service. But there are situations where speaking to an accountant first saves time and money.

If you are unsure about the most tax-efficient structure for your business, an accountant can advise on whether a limited company is right for you compared to being a sole trader or partnership. The decision affects your tax bill, your National Insurance, and your personal liability.

If you plan to have multiple shareholders with different rights, an accountant can help you set up the share structure correctly from day one. Alphabet shares, different dividend rights, and voting rights all need to be documented in the articles of association and the shareholder agreement.

If you are buying an existing business or incorporating a sole trader business, the process is more complex. You need to consider capital gains tax on the transfer of assets, VAT implications, and the treatment of goodwill. Our incorporation services cover these scenarios in detail.

As ICAEW qualified accountants, we see the fallout from rushed incorporations all the time. A name dispute, a missed filing deadline, or a poorly structured shareholding can cost far more than the accountant's fee to sort out. If your situation has any complexity, spend the money upfront.

Final Practical Steps

Before you click submit on the IN01 form, run through this checklist:

  • Has the name cleared the Companies House exact match check? Yes.
  • Has the name cleared the IPO trademark search? Yes.
  • Have you checked for unregistered trading names and domain names? Yes.
  • Is your registered office address appropriate for public display? Yes.
  • Do you have a SIC code that accurately describes your business? Yes.
  • Have you appointed at least one director and one shareholder? Yes.
  • Do you know who your PSC is? Yes.

If you tick all seven, you are ready to register. If any box is unchecked, pause and resolve it before proceeding. A few hours of due diligence now can save you thousands of pounds and months of stress later.

For more guidance on the full process, including what happens after incorporation, see our business fundamentals guide. If you need help with the name checks or the registration itself, get in touch with our team.