If you’re planning to set up a limited company in the UK, registering with Companies House is a legal requirement. It’s a straightforward process, but it helps to know what to expect before you begin. This guide walks you through the key steps, what you’ll need, and how to ensure everything is done correctly.

What is Companies House?

Companies House is the UK government’s official register of companies. When you set up a limited company, it becomes a legal entity separate from you, and Companies House records and monitors key information about it—such as who runs it, where it’s based, and its financial performance.

Step-by-Step: How to Register

1. Choose Your Company Name

Make sure your name:

• Is unique and not too similar to an existing company
• Doesn’t include restricted words (like “Royal” or “Bank”) unless authorised
• Ends in “Ltd” or “Limited”

Check availability using the Companies House name checker.

2. Decide on Your Company Structure

You’ll need at least:

• One director (must be at least 16 years old)
• One shareholder (can be the same person as the director)

You’ll also decide on:

• The number of shares
• A standard “memorandum and articles of association” (rules for running the company)

3. Provide a Registered Office Address

This must be a physical address in the UK. It will appear on the public register, so if you work from home and prefer privacy, consider using a registered office service or virtual office.

4. Select a SIC Code

This is a Standard Industrial Classification code that defines your business activity (e.g., retail, software development, consulting). You can find the full list on the Companies House website.

5. Register Online or by Post

Most people register online via the Companies House Web Incorporation Service. It costs £12 and usually takes 24 hours.
If you choose to register by post, it costs £40 and takes 8–10 days.

6. Register for Corporation Tax

After your company is registered, you must also register for Corporation Tax with HMRC within 3 months of starting any business activity. This is a separate step and ensures your company complies with tax obligations.

✅ Final Checklist

• Company name checked and approved
• Director(s) and shareholder(s) confirmed
• Registered office address ready
• SIC code selected
• Articles of association agreed
• Registered online or by post
• Corporation Tax registration completed

Setting up your limited company is a big milestone. Once registered, you’ll be officially in business—and ready to start building something great.