Getting through to Companies House is slower than most business owners expect. Whether you need to update registered details, query a filing, or verify your company number before setting up advertising accounts, the process has specific routes — and some are more reliable than others.
This article covers how to call Companies House, what you can actually resolve over the phone, when you're better off using their online services, and how getting your company details right affects everything downstream — including your Google Ads setup.
How to Call Companies House: The Direct Numbers
The main Companies House contact number for general enquiries is 0303 1234 500, available Monday to Friday, 8:30am to 6pm. For Welsh language enquiries, the number is 029 2038 0065. If you're calling from outside the UK, dial +44 303 1234 500.
The call volumes vary significantly depending on the time of year. In our experience running a marketing agency for nine years — and helping SME clients get their business registrations in order before launching ad campaigns — the phone lines are noticeably busier around the January and March filing deadlines. If you need to call Companies House for something time-sensitive, earlier in the morning is consistently faster than the afternoon.
One thing worth knowing: Companies House phone agents cannot make changes to your registered details directly during the call. They can advise on the correct process and confirm what's on the public register, but amendments go through the WebFiling portal or by post depending on the form type.
| Contact Method | Use Case | Typical Response Time |
|---|---|---|
| Phone: 0303 1234 500 | General enquiries, filing queries | Immediate (queue dependent) |
| Online chat | Quick questions, guidance | Same day |
| Email / webform | Complex queries, formal requests | 5–10 working days |
| WebFiling portal | Address changes, officer updates | Real-time once submitted |
| Post | Specific form submissions (e.g. RP07) | 5–10 working days |
The phone is best for clarification. For anything that requires a change on the register, you'll need to go online or post the relevant form.
What You Can Actually Resolve When You Call Companies House
This is where a lot of business owners lose time — assuming that calling Companies House will fix the issue directly. It rarely does, but the call is still valuable for orientation.
You can use the phone line to understand which form you need to file, confirm whether a document has been received and is being processed, check the registered office address currently showing on the public register, and clarify deadlines for confirmation statements or annual accounts.
What you cannot do over the phone: change your registered address, update director details, file a confirmation statement, or dispute information filed by another party. Those all require formal submissions. If you're dealing with a third-party dispute — say, a former director or shareholder has filed incorrect information — the phone team can point you to the relevant complaint process, but resolution takes significantly longer.
From a practical standpoint, if you're trying to call Companies House because your company number or registered address doesn't match what's showing in your Google Ads billing account, that's a separate issue from the register itself. Google pulls billing information from what you enter manually, not directly from Companies House. Fixing the register is step one; updating your ad account is step two.
For a broader look at what SMEs need to know about their company registration details, the article on Company House Number: What SMEs Actually Need covers the verification process in detail.
When Calling Is Faster Than Online
The WebFiling portal and Companies House online services handle the vast majority of routine filings efficiently. But there are specific situations where picking up the phone is genuinely the quicker route.
If your WebFiling authentication code hasn't arrived, calling speeds up the reissue process. If you've received a formal notice about a strike-off and you're not sure whether your company is still live, a call confirms the current status immediately rather than waiting on a webform response. And if you're trying to understand why a document was rejected — particularly if the rejection reason isn't clear from the correspondence — the phone agents can often explain what specifically needs correcting.
The online services are better for everything routine. The phone line is best treated as a diagnostic tool rather than a transactional one.
Why Your Companies House Details Matter for Google Ads
This is a connection that often gets missed. When you're setting up or managing Google Ads for a UK business, your registered company details affect billing verification, VAT number validation, and in some cases advertiser identity verification — particularly since Google introduced additional verification requirements for certain business categories.
If your registered address has changed but you haven't updated Companies House, and then try to verify your business identity for Google's ad serving requirements, the mismatch creates friction. We've seen this delay campaign launches by days when it could have been avoided by ensuring the register was accurate beforehand.
This matters even more for businesses running significant ad spend. If you're spending meaningfully on Google Ads and your account goes into a billing hold because of an identity mismatch, every day of downtime costs real money. Getting your Companies House record right isn't just a compliance issue — it's an operational one.
For SMEs who want to understand how much Google Ads actually costs and how billing verification fits into the setup, that context is worth reading before you launch.
Overtime, the AI agent built for SME Google Ads management, works with the account details you've already verified. If those details are inconsistent with what's on the public register, that's something to resolve before any ad management system — human or AI — can operate cleanly. See how Overtime handles Google Ads management end-to-end.
How to Update Details Without Calling Companies House
For most changes, the WebFiling portal at find-and-update.company-information.service.gov.uk is the right route. You'll need your company number and authentication code to log in.
Common changes and the forms they require:
Changing your registered office address uses form AD01, which can be filed online and takes effect immediately on submission. Changing director details uses form CH01 for name changes and AP01 for appointing new directors. Changing your company name requires a special resolution and form NM01 — this one cannot be done purely online in all cases, and it's worth calling Companies House to confirm the current requirements before filing.
For companies with PSC (Persons with Significant Control) changes, form PSC04 handles updates to existing PSC details. PSC information is particularly relevant if you're running Google Ads that require advertiser verification, since that process can ask for information about beneficial ownership.
If you want to understand how getting these business fundamentals right connects to building a functional paid search presence, the guide on how to advertise your business with Google Ads covers the account setup context well.
Alternatives to Calling Companies House in 2026
The service has improved its self-serve options considerably. The Companies House search function at find-and-update.company-information.service.gov.uk lets you look up any registered company, check filing history, download documents, and verify current officer and address details — all without needing to call.
For urgent matters, the online live chat option (available during business hours) has become a reliable alternative to phone for straightforward questions. Response times are comparable to calling, without the hold music.
Third-party registered agent services are worth considering if your business regularly needs to file documents or manage Companies House obligations. They handle the administration on your behalf, which reduces the number of times you personally need to call Companies House for guidance.
For SMEs managing Google Ads alongside these administrative obligations, the overhead of maintaining both is real. That's where having Google Ads managed by an AI agent — rather than adding it to an already full administrative plate — makes practical sense. Review the options for SME Google Ads management.
It's also worth reading about pay per click management for SMEs if you're at the stage of working out whether to manage ads in-house or use external support.
What to Have Ready Before You Call
If you do need to call Companies House, having the right information to hand makes the call significantly shorter. You'll need your company registration number (the eight-digit number beginning with a letter for Scottish or Northern Irish companies, or purely numeric for English and Welsh companies), your registered company name as it appears on the register, and ideally the reference number from any correspondence you've received.
For billing queries specifically, having the document reference from a rejected filing or the transaction ID from WebFiling speeds things up considerably. The phone agents work from the same public register you can access online, so the more specific you are about what you're querying, the more useful the call will be.
If your reason for needing to call Companies House relates to an advertising or billing verification issue, also pull up your Google Ads account ID before calling — that way you can cross-reference the details being held on both systems during the same conversation.
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Before you call Companies House, check the public register at find-and-update.company-information.service.gov.uk first — it's likely to answer your question immediately. If the issue is a mismatch between your registered details and your Google Ads account, resolve the Companies House record first, then update your ad account. And if managing Google Ads on top of routine business administration is taking more time than it should, Overtime handles the ongoing management — adjusting bids, pausing underperformers, reallocating budget, and sending you clear summaries — so you can focus on the business itself.
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Frequently Asked Questions
How do I call Companies House from the UK?
The main number is 0303 1234 500, available Monday to Friday from 8:30am to 6pm. For Welsh language enquiries, call 029 2038 0065. Have your company registration number ready before you dial.
What can you actually do when you call Companies House?
You can get guidance on which forms to file, confirm whether a document has been received, and check what details are currently showing on the public register. You cannot make changes to your registered details directly over the phone — those require formal submissions through WebFiling or by post.
Why would an SME need to call Companies House before setting up Google Ads?
If your registered address or company details are out of date, they may conflict with Google's advertiser verification requirements, which can cause billing holds or identity verification failures. Confirming your register is accurate before launching a campaign avoids unnecessary delays.
Should I use the online services instead of calling Companies House?
For most routine filings and updates, yes — WebFiling is faster and updates the register in real time. Calling is most useful when you need to understand a rejection, haven't received an authentication code, or are dealing with a time-sensitive query that needs immediate clarification.
Do I need my company number to call Companies House?
You don't strictly need it, but having it ready makes the call much more efficient. The agents work from the public register, so providing your company registration number allows them to pull up your record immediately rather than searching by name, which can return multiple results for common company names.