Companies House Autofill

Add company lookup to your forms in minutes. Users search by name or number, select a result, and your form fields populate automatically with verified Companies House data.

Get started free See how it works

Get started in 3 steps

Sign up for free

Create your account and organization in under a minute. No credit card required.

Create account →

Get your site token

Add a site in the dashboard to receive your unique license key.

Go to dashboard →

Install the widget

Drop our WordPress plugin or JS snippet into your site and configure field mapping.

View install guides →

Sample normalized payload

Stratagem shares schema helpers with the widget and Worker. Here's what the normalized Companies House profile looks like for a real record:

{
  "number": "00445790",
  "name": "Tesco PLC",
  "status": "active",
  "type": "plc",
  "address_line1": "Tesco House",
  "address_line2": "Shire Park",
  "locality": "Welwyn Garden City",
  "region": "Hertfordshire",
  "postal_code": "AL7 1GA",
  "country": "England"
}

Try it yourself

Test with real company numbers. The API returns normalized JSON matching our shared schema.

00445790 — Tesco PLC
01026167 — Barclays Bank PLC
04706930 — Rolls-Royce Holdings plc

View live API response →

Install options

WordPress Plugin

Install via zip upload or WP-CLI. Add the shortcode to any form page.

[companies_house_autofill mapping='{"name":"#company_name"}']

View documentation →

JavaScript Widget

Include the script and call attach() with your field mapping.

CHAutofill.attach({
  containerId: 'company-search',
  mapping: { name: '#company_name' }
});

View documentation →

PHP SDK

Server-side library for custom PHP applications.

$client = new CompaniesHouseClient([
    'workerUrl' => 'https://chapi.stratacompliance.com',
    'siteToken' => 'your-license-key',
]);

View documentation →

API endpoints

Base URL: https://chapi.stratacompliance.com

Method	Endpoint	Description
GET	/search?q={query}	Search companies by name or number
GET	/company/{number}	Fetch company profile
GET	/company/{number}/officers	List company officers (Pro)
GET	/company/{number}/persons-with-significant-control	List PSCs (Pro)
GET	/company/{number}/filing-history	Filing history (Pro)