People hear “the UK registers companies in 24 hours” and assume the whole thing is effortless. It can be. But only if you know what you are walking into before you start.
Starting a company in the UK means dealing with naming rules that have actual teeth, a new identity verification requirement that became mandatory in November 2025, and compliance obligations that begin the moment your company exists. Get ahead of all three and the process is genuinely smooth. Skip one and you are dealing with a rejection or a legal problem you did not budget for.
Here is everything you need to know.
Company Name, Business Name, Trading Name. They Are Not the Same Thing
This trips people up constantly so let us clear it up first.
- Company name: Your legal registered name with Companies House, for example “Fletcher Designs Ltd.” Once registered, no other UK company can use that name. That is your protection
- Trading name: The name you operate under publicly if it differs from your company name, for example “Fletcher Creative Studio.” No automatic legal protection here. You would need a separate trademark to protect it
- Sole trader name: If you go the sole trader route, you do not register with Companies House at all. You register with HMRC for Self Assessment and your trading name is unprotected unless you trademark it yourself
Know which one you are dealing with. It changes everything about what you need to do next.
Pick Your Structure Before You Pick a Name
The name conversation cannot happen until the structure conversation does. Your main options when starting a company in the UK are:
- Sole Trader: Minimal paperwork, you are up quickly, but every business debt is personally yours
- Private Limited Company (Ltd): The most common serious choice. Limited liability, legal name protection, trusted by banks and investors, but comes with annual filing obligations
- Limited Liability Partnership (LLP): Suits professional partnerships that want some liability protection without a traditional company structure
- Branch of a Foreign Company: For overseas businesses entering the UK without setting up a brand new local entity
Most people building something with real ambition go Ltd. Banks expect it, clients recognise it, and investors require it. The rest of this guide is built around that structure.
The Naming Rules Are Strict. Here Is What Will Get You Rejected
Companies House has clear rules and they got stricter under the Economic Crime and Corporate Transparency Act 2023, which has been phasing in since 2024.
Names That Will Not Pass
- Identical or confusingly similar names: If something close already exists on the register, yours gets rejected. It does not have to be a perfect match
- Offensive names: Rejected outright. No exceptions
- Restricted words without approval: “Royal,” “British,” “Bank,” “Institute,” “Trust,” “Government,” “Windsor” and similar words all need written approval from a relevant authority before you can use them
- Names implying false connections: Suggesting you are linked to a government body or regulated profession when you are not is grounds for rejection
- Computer code in the name: Banned since March 2024
- Names longer than 160 characters: Including spaces
Three Checks You Need to Do Before You Commit to a Name
- Search the Companies House register. Is it taken or too similar to something already there?
- Search the UK Intellectual Property Office trademark database. The last thing you want is to build a brand and then receive a letter from a lawyer
- Check domains and social handles. Registering a company name does not secure a domain or protect a trademark. These are completely separate things
Do all three before you fall in love with a name. Rebuilding your brand six months in is painful and expensive.
The Identity Verification Requirement Nobody Warned You About
This is the biggest change to UK company registration in a generation. A surprising number of people going through their first registration in 2025 and 2026 have no idea it exists.
From 18 November 2025, identity verification became a legal requirement under the Economic Crime and Corporate Transparency Act 2023. Here is what it actually means for you:
- Every new director must verify their identity before they can incorporate a company or be appointed to an existing one. Not after. Before
- Verification happens either directly through Companies House using GOV.UK One Login, which is free, or through a registered Authorised Corporate Service Provider (ACSP) which charges a fee
- Once verified, you get a unique personal Companies House code. You use that code for all future filings. You only verify once, ever
- Existing directors have until their company’s next confirmation statement filing date to complete verification. Missing that deadline means the company cannot file its confirmation statement at all, which affects credit ratings and can trigger penalties
- For overseas directors who cannot easily use GOV.UK One Login, going through an ACSP is the practical route. Build in extra time because it takes longer
Acting as a director without completing verification after 18 November 2025 is a legal offence. This is not a soft guideline.
What You Actually Need to Register a Private Limited Company
Name confirmed. Identity verified. Here is what goes into the actual application:
- Registered office address: A physical UK address. No P.O. boxes. All official government and legal correspondence lands here
- Director details: Full name, date of birth, nationality, residential address (kept private), and a service address which is publicly visible on the register. Directors must be 16 or older and not legally disqualified
- Shareholder details: Names, addresses, number of shares, and share class for everyone who will own part of the company
- Share structure: How many shares, at what nominal value, and to whom they are going
- SIC code: The Standard Industrial Classification code that describes what your business actually does. You can have more than one
- Memorandum of Association: A declaration from all initial shareholders that they agree to form the company. When you register online this generates automatically
- Articles of Association: The internal rules of how your company is run. You can use Companies House’s standard model articles or submit custom ones
- Registered email address: Required since March 2024. Any official communication sent here is legally treated as delivered
The online registration fee is £50. Most online applications complete within 24 hours. There is almost no good reason to use the postal route for a standard incorporation.
Best Practices That Actually Make a Difference
Check the name three different ways before you decide
Companies House, then the trademark database, then social media and domains. All three. A name that clears all three is worth building on. One that does not is a problem you are better off finding now.
Use the model articles unless your situation genuinely needs something custom
Standard model articles from Companies House work fine for a simple solo or two-person setup. Custom articles make sense when co-founders have different rights, when investors are coming in, or when your governance needs are more complex. Do not add complexity for the sake of it.
Do not assume company name registration protects your brand
It stops another UK company from registering the same name. That is all. It does not stop a sole trader from trading under something similar, and it does not give you trademark rights. If your brand matters to your business, apply for a UK trademark through the Intellectual Property Office. Applications start from £170 and protection lasts ten years, renewable indefinitely.
Build your compliance calendar the day you incorporate
From the moment your company exists, obligations are running. Here is what needs to go in the calendar immediately:
- Register with HMRC for Corporation Tax within three months of starting to do business
- File annual accounts with Companies House, due nine months after your financial year-end
- File a confirmation statement at least once every 12 months
- Register for VAT if annual turnover will exceed £90,000
- Keep your registered office address and company details accurate at all times
These are not optional and the penalties for missing them are automatic. Ten minutes setting up a calendar on day one saves real money and stress later.
Starting a Company in the UK the Right Way
The UK is still one of the fastest and most respected places in the world to incorporate. But the process has more layers than the 24-hour turnaround time suggests, especially now that identity verification is mandatory and the naming rules have tightened.
Nail the name, pick the right structure, get verified before you apply, and build the compliance calendar before you celebrate. Those four things cover the vast majority of problems people run into.
At Aadmi, we work with entrepreneurs and international businesses through every step of starting a company in the UK. Registration, compliance setup, registered office services, and everything that follows. No missed steps, no surprises.
It also helps to look into UK company registration requirements, Companies House filing obligations, private limited company setup, UK business compliance, and corporate services in the UK before you begin.
FAQs
Does registering a company name in the UK protect it as a trademark?
No. It stops another company from registering the same name with Companies House, but trademark protection is a completely separate process through the UK Intellectual Property Office.
How long does UK company registration take?
Online applications through Companies House typically complete within 24 hours. For overseas founders going through the identity verification process via an ACSP, factor in additional time before you can submit.
Can someone from outside the UK own or run a UK company?
Yes. There is no residency or citizenship requirement to own a UK company. However, all directors must now complete identity verification under the November 2025 rules, which can take longer for those outside the UK.
What is the difference between a registered office and a trading address?
Your registered office is the official legal address for all government correspondence and must be a physical UK address. Your trading address is simply where you operate day-to-day. They can be the same or different.
What happens if I try to register a name that is already taken?
Companies House will reject the application. You will need to choose a different name. If someone is using a similar name as a sole trader rather than a registered company, that is a separate legal matter and falls outside the registration process.
