How to Change SIC Code on Companies House – Step-by-Step Guide UK 2025

Companies House is the central authority in the United Kingdom for registering and managing company details. Every business on the public register must provide accurate information, including its Standard Industrial Classification (SIC) code, which identifies its trade or industry sector. This code acts as a label for your business activity, ensuring government departments, researchers, and industry bodies have consistent data.

For many entrepreneurs, one question often arises: how to change SIC code on Companies House when circumstances change? Whether you have pivoted into a new industry, realised you entered the wrong code during incorporation, or need to expand your classifications, the process is simpler than it seems. By following the right steps, you can make sure your business remains compliant, transparent, and correctly represented on the public record.

What is a SIC Code and Why is it Important

A SIC code, also known as Standard Industrial Classification, is a numerical identifier for the type of business activity your company carries out. It is not a random number but part of an official system used for decades by governments across the world. In the UK, Companies House requires every business to provide at least one SIC code when submitting its annual confirmation statement.

The importance of SIC codes goes beyond formality. These numbers help agencies such as HM Revenue & Customs (HMRC) track industry trends and taxation data, while banks and investors use them to evaluate risk in specific sectors. If your company is categorised incorrectly, it may face difficulties in credibility, reporting, or access to certain financial products. Knowing how to change SIC code on Companies House gives you control over this critical piece of information.

When Should You Change Your SIC Code

Businesses evolve over time, and with those changes comes the need to update official records. One of the most common situations where you should consider updating your SIC code is when your business model changes. For instance, a company that started out offering consultancy services might later diversify into technology development or retail. Keeping the same SIC code would misrepresent the true scope of operations.

Errors made during incorporation are another reason to make updates. The SIC code list is long and often confusing, with many categories sounding similar. It is easy for a new business owner to select the wrong one without realising the consequences. If you find your company is misclassified, learning how to change SIC code on Companies House ensures your data is corrected and reflects reality.

Preparing to Update Your SIC Code

Before filing any updates, it is wise to prepare. Begin by reviewing your current listing using the Companies House Beta search. This free online tool allows you to see the information the registrar holds about your company, including your present SIC code. You will need your company number or registered name to access these records.

Next, make sure you have the correct replacement code. The UK government publishes the official list of SIC codes on GOV.UK. Take the time to read through the options and choose the one that best matches your primary business activity. If you run more than one type of business, you may need to include multiple SIC codes. Preparing these details before you log in will save you time and avoid mistakes.

How to Change Your SIC Code on Companies House Step by Step

To begin the process, sign in to Companies House WebFiling using your company credentials. You will need your email, password, and authentication code. With the introduction of enhanced security in 2025, directors may also need to complete identity verification before accessing certain services, ensuring that only authorised individuals can make changes.

Once logged in, navigate to the confirmation statement form, officially known as CS01. This form is usually filed annually, but you can submit it at any time if you need to make urgent changes. Within the form, there is a section specifically for SIC codes. Here, you can add, remove, or correct codes as needed. Once completed, pay the small filing fee, and submit the form electronically.

Common Mistakes to Avoid When Updating Your SIC Code

One frequent mistake is selecting the wrong SIC code due to misunderstanding or rushing through the list. Many codes look alike or overlap, and choosing incorrectly can cause problems with reporting or compliance. Always double-check your chosen code with the official list before submitting your statement to Companies House. Accuracy at this stage prevents complications later.

Another issue arises when businesses forget to include all relevant SIC codes. A company is allowed to register more than one code if it operates across multiple sectors. For example, a business that manufactures products but also provides repair services may need two different codes. Understanding how to change SIC code on Companies House helps you file a complete and reliable confirmation statement that reflects your true operations.

How to Check That Your SIC Code Has Been Updated

After submission, you should always verify that the update has been processed. The easiest way is to use the Companies House Beta search. Enter your company details, and you will be able to see the most up-to-date records, including the SIC codes associated with your company. Changes normally appear within a few working days after filing.

Keeping copies of your confirmation statement and submission receipt provides additional reassurance. If the changes do not show up after a reasonable period, you can contact Companies House through their support services for clarification. Monitoring your records ensures your company remains accurately represented to the public and regulators alike.

Other Useful Companies House Services Related to SIC Codes

In addition to updating your SIC code, Companies House offers a wide range of useful tools. The name check service allows you to confirm whether your proposed company name is available and complies with legal requirements. The company search feature lets you explore details of other businesses, including their SIC codes, which can be helpful when researching competitors or industry peers.

Companies House is also enhancing identity verification processes as part of its wider crackdown on corporate transparency. Familiarising yourself with services such as WebFiling, Companies House login, and the Beta search portal will help you stay compliant. For more complex issues, the Companies House contact service is available to guide business owners through problems or queries.

Conclusion

Updating your company’s SIC code is not simply a box-ticking exercise; it is an essential part of maintaining an accurate business identity on the public register. A correct SIC code ensures transparency, helps regulators and researchers, and prevents confusion with banks, clients, and partners. Companies House makes this process straightforward through its confirmation statement system.

By understanding how to change SIC code on Companies House, preparing properly, and avoiding common errors, you can update your records confidently. Whether your business evolves, expands, or simply corrects a past mistake, keeping your SIC code accurate is a sign of professionalism and compliance in today’s competitive business environment.

FAQs About Changing SIC Code on Companies House

Can I have more than one SIC code for my company?
Yes, companies can list multiple SIC codes to reflect different business activities.

What happens if I don’t update my SIC code?
Your company could be misclassified, which affects compliance, credibility, and official data.

Can I change my SIC code before my confirmation statement is due?
Yes, you can file an early confirmation statement to update details immediately.

How do I find my company’s SIC code on Companies House Beta search?
Search for your company name or number to view your registered SIC code and other details.

Is there a penalty for filing the wrong SIC code?
While there is no direct fine, providing incorrect information can cause compliance issues and misrepresentation.

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