How to Change SIC Code in Confirmation Statement – UK Guide 2026

Team Nomi

Apr 10, 2026
6 minutes read

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As your business grows or evolves, the type of work you do might change, and your official records must keep pace. You can change your SIC code by filing a Confirmation Statement (CS01) through Companies House WebFiling. Log in, select your company, update SIC codes, and submit the form. The update appears once processed.

Your SIC (Standard Industrial Classification) code tells Companies House what your business does. To change your company’s SIC code, update it when filing your next Confirmation Statement (CS01) through Companies House filing.

In this guide, you’ll learn How to Change SIC Code in Confirmation Statement step by step.

How to Change Your SIC Code in a Confirmation Statement

If your company’s business activities have changed or you realise an error in your current SIC code, it’s important to update this information. If you’re searching for how to change SIC code on Companies House, the process below explains it clearly.

You can easily change your SIC code by filing a Confirmation Statement (CS01).

Steps to Change Your SIC Code

1. Log in to Companies House Online Services: Access the Companies House WebFiling service using your company authentication code and password to begin how to change SIC code on Companies House.
2. Select Your Company: Once logged in, choose the company for which you wish to change company SIC code details.
3. File a Confirmation Statement (CS01): You can file a Confirmation Statement at any time during your company’s review period. If you need to update your SIC code before the next due date, you can submit an early Confirmation Statement as part of the change SIC code Companies House process.
4. Update the SIC Code Section: Within the confirmation statement, navigate to the section for SIC codes. Here, you can:

• • Add new SIC codes that reflect your current business activities
  • Remove any SIC codes that are no longer applicable

5. Submit the Confirmation Statement: After making the necessary changes, submit it to complete the Companies House change of SIC code process.
6. Confirmation and Record Update: Once processed, Companies House will update your company’s public record with the new SIC code.

Additional Information

If you’re unsure about which SIC code to use, consult the official list provided by Companies House.

Keeping your SIC code up to date ensures that your company’s information accurately reflects its business activities.

Why Do We Need SIC Codes?

The following are the reasons why we need SIC Codes:

• • They help Companies House and the government keep track of businesses.
  • They help with statistics and reports.
  • They help people find companies in the same industry.
  • You can have up to four SIC codes.

This is useful if your company does more than one thing. For example, if you want to add another SIC code on Companies House, you can include it during your Confirmation Statement filing.

When Should You Change Your SIC Code?

You should change the company SIC code details when your business activities change or if you notice an error in the code currently listed. A SIC Code Update ensures this is accurately shown on the public record.

Here are the main reasons why keeping your SIC code up to date is important:

• • Reflects Actual Business Activities: If your company starts offering new services, stops a previous activity, or shifts its main focus, your SIC code should reflect this.
  • Corrects Mistakes: Sometimes, the wrong SIC code is selected by mistake when the company is first registered. Correcting this ensures your company is properly listed with Companies House.
  • Keeps Records Accurate: Government bodies, investors, and banks often use SIC codes to learn about your business.
  • Fulfills Legal Obligations: You are legally required to keep your company information up to date with Companies House.
  • Reflects Business Growth or Change: Adding or removing codes through a Companies House change SIC code process shows how your business is evolving.

How to Find the Right SIC Code

Before you make Confirmation Statement changes, you need the right SIC code.

• • Use the official SIC code list from Companies House
  • Type in a word that describes your business, like “bakery” or “cleaning.”
  • Look at the options and pick the one that matches your main activity.
  • If you are not sure, ask an accountant or a company formation agent.

If your company does more than one thing, you can add more SIC codes (up to four). This is useful if you’re looking at how to add another SIC code on Companies House.

Examples of Technical Activity SIC Codes

The UK SIC system assigns specific codes to different industries. Examples include:

1. 62020 – Information Technology Consultancy Activities
2. 62030 – Computer Facilities Management Activities
3. 71122 – Engineering Related Scientific and Technical Consulting Activities
4. 71200 – Technical Testing and Analysis
5. 72110 – Research and Experimental Development on Biotechnology
6. 72190 – Other Research and Experimental Development
7. 74901 – Environmental Consulting Activities
8. 74902 – Quantity Surveying Activities
9. 74909 – Other Professional, Scientific and Technical Activities

For a comprehensive list of SIC codes, you can refer to the official UK SIC code list provided by Companies House. Keeping this information updated in your next Confirmation Statement ensures accurate records and smooth Companies House filing.

You’re a business owner or an accountant, and need to change your company’s SIC code. Nomi’s company secretarial software makes it easy. This software simplifies company secretarial tasks, ensuring everything is compliant and up to date. Experience its advantages by signing up for a 30-day free trial, or you can book a free demo to see its features and functionalities in action.

Frequently Asked Questions

1. How do I change a company’s SIC code?
   Ans: You can change it by filing a Confirmation Statement (CS01) and updating the SIC code section.
2. Do you have to file a confirmation statement to change SIC code?
   Ans: Yes, you must file a Confirmation Statement to update your SIC code with Companies House.
3. What happens if your SIC code is wrong?
   Ans: A wrong SIC code can misrepresent your business and may affect loans, contracts, or official records.
4. Can you change a confirmation statement?
   Ans: You cannot edit a submitted one, but you can file a new Confirmation Statement to correct any mistakes.