Generate B2B Leads for Free: 12 Sources and Methods That Work in 2026

When founders ask me where to get B2B leads without a budget, I answer with a question of my own. How many hours a week are you willing to put in? In B2B, free means time instead of money. If you accept that, you will find more freely accessible company data in the UK than most people assume. In this guide I show you which sources and channels will generate B2B leads for free in 2026, what a “free” lead actually costs you and at what point a tool pays for itself.

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What “free” really means with B2B leads

A lead is free if you pay no money for it to a provider, a platform or an agency. The working time for research, checking and outreach still has to be spent. That time decides whether the route is worth it. A salesperson at €60 an hour who checks eight companies an hour and discards half of them produces leads at €15 apiece.

For comparison it is worth looking at paid channels. For its cost-per-lead benchmarks 2025, Sopro combined data from its State of Prospecting report with several market studies. Across all channels, a B2B lead costs around $480 on average, which is just over €400. Referrals come in at $25, SEO at $206, direct mail at $250, cold calling at $300 and trade shows at $840. A self-researched lead at €15 of working time, or €24 at five companies an hour instead of eight, is therefore genuinely cheap. Its problem lies elsewhere. It only grows with your hours.

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In my experience the realistic value for “companies an hour” is closer to five than eight for beginners. Finding the right contact eats up most of the time. Set the slider to both values once. The difference between €15 and €24 per lead decides later on whether a tool is worth it. Monday and Tuesday in the weekly plan further down can also be handled by an assistant or an apprentice, which is why the hourly rate slider starts at €20.

Free data sources for your own B2B lead lists

The most valuable free B2B leads come from lists you build yourself from your existing customer base and from public sources. This route is called outbound because you make the first move. The advantage over any inbound channel is control. You decide on the sector, region and size. The first conversations are possible within two weeks. The overview below shows what the individual sources deliver in the UK.

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Your own customer base, old quotes and referrals

The fastest free source is in-house. Former customers, quotes turned down a year ago and contacts who said “later” at the time already know you. The contact person is sitting in your inbox. Then there is the question to satisfied customers of who they know who faces the same problem. Sopro lists referrals at $25 as the cheapest channel of all. How to approach these contacts without coming across as a supplicant is covered in the guide to warm outreach in B2B.

Companies House

Companies House holds the register for every limited company and LLP in England, Wales, Scotland and Northern Ireland. Searching the register is free and so is viewing the documents a company has filed. You get the legal form, the registered office, directors and persons with significant control by name, plus every filing and change. If you also sell into Germany, the Unternehmensregister, Germany’s company register, is the counterpart and is free to search as well.

I do not use the register for bulk lists, the search is too granular for that. The real value lies in the changes. A new incorporation in your target sector, a change of director or a move of the registered office are triggers at which a company is sorting out its suppliers. The advanced search lets you filter by incorporation date, SIC code and location. You can also follow individual companies to get an alert on every new filing. Anyone who works through the new incorporations for their region once a week has a small but very current list. Which triggers are suitable for outreach is covered in the guide to trigger events in sales.

Google Maps and Google Business Profile

For regional target groups, Google Maps is the richest public source. A search like “sheet metal fabrication Birmingham” delivers 50 to 120 firms with address, phone number and website in minutes. The reviews tell you how active a firm is. The website takes you to the company details in the footer and on the About page and from there to the owner. How to turn a map search into a usable list is covered in the guide to scraping Google Maps businesses.

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Chambers of Commerce, trade associations and trade bodies

Local Chambers of Commerce publish member directories that can usually be filtered by sector and town. Trade associations and trade bodies, from the Federation of Master Builders to the British Plastics Federation, often publish member lists with specialism and location. The bodies for the building trades frequently add the owner’s name. In the trades and in manufacturing these directories are often more current than any purchased database because membership is maintained and paid for every year. For target groups like “roofing contractors in the Midlands” or “members of the British Plastics Federation” there is hardly a better free source.

Trade show exhibitor lists

Anyone exhibiting at a trade show is spending money on visibility and has a sales team that is building capacity right now. The exhibitor directories of the big shows at the NEC in Birmingham or ExCeL in London are freely available online, often with a contact, product category and hall. Go through them by hand, most organisers prohibit automated extraction in their terms of use. A list of the exhibitors at your target show is a ready-made sector list with a built-in buying signal. The catch is the competition. Every competitor can pull the same list, which is why outreach before the show works better than afterwards.

Job adverts as a buying signal

A company that is currently looking for a second salesperson, an IT administrator or an executive assistant is growing in that spot. Job boards like Indeed, Reed or LinkedIn Jobs can be filtered by region and function. The advert often even names the contact. I consider job adverts the most underrated free source because they deliver the need and the contact in one document.

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Public procurement portals

Public bodies must advertise their contracts above certain values. Contracts Finder lists opportunities from the public sector in England free of charge, higher-value procurements across the UK are published on Find a Tender and Scotland, Wales and Northern Ireland run their own portals. For service providers and suppliers these are leads with a specification and a deadline. The route runs through a bid rather than a first contact, so it only belongs in the weekly plan if your offer targets public-sector buyers.

LinkedIn search without Sales Navigator

Even without a paid account you can find contacts on LinkedIn by title, company and region. LinkedIn throttles search on the free account as soon as it detects commercial use. LinkedIn does not state the exact number and the limit resets at the start of the month. You only see contact details after connecting. Automated extraction breaches the terms of use and can cost you the account. For a company list from Companies House or Maps, manual search is still the best route to the current holder of the role. How to use LinkedIn for lead generation, shown on the German-speaking market, is described in the guide to LinkedIn lead generation in the DACH region.

Filed accounts and register portals

Every limited company and LLP files annual accounts at Companies House, where they can be viewed free of charge. To qualify a list, a glance at the balance sheet total and the average number of employees in the notes is often enough to see whether a company falls within your size band. Turnover appears mainly in the accounts of medium-sized and large companies. Small companies and micro-entities can file abridged accounts that show little beyond a balance sheet, so headcount is usually the more reliable size indicator. Endole prepares register data and shows key financials and director changes in its free single-company lookup, OpenCorporates mainly gives you basic details and officers. Lists and exports cost money on both, the free versions are enough for checking individual companies.

Free inbound channels that hold up in B2B

Inbound means the company makes the first move. That is the more comfortable lead but the slower channel. The overview shows what to expect from the four free channels. The timings are experience from small B2B companies rather than figures from studies.

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The most important inbound channel in B2B is the LinkedIn profile of the person who is responsible for the business. The company page plays a supporting role alongside it. One post a week on a problem your target group has, comments on the people you want to reach and a profile that says in two sentences who you help with what are enough. In my view the channel rarely fails on content and almost always because people stop after six weeks without an enquiry.

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For regional providers, Google Business Profile is the fastest inbound channel. A well-kept profile with current photos, services and ten genuine reviews appears above the organic results for searches like “accountant Leicester” or “CNC machining Coventry”. Guide content on your own website takes the longest but is the only channel that keeps bringing enquiries without weekly work once it is built. Trade forums and communities work if you answer questions there without mentioning your offer. After a few weeks the first enquiries arrive by direct message.

From company name to the right contact

A company list is not yet a lead. The lead comes into being when you know who in the company is responsible for your topic and how to reach that person. This step also works without a tool but takes the most time in the chain.

The company details on the website and the About page name the directors. In firms of up to 50 staff that is usually the right address and Companies House confirms the names. The team page or LinkedIn gives you department heads and senior managers. The email address often follows the company’s pattern, which you will find on the team page or in the press contact, say firstname.surname or first initial plus surname. You mainly need it for following up after a call in which the contact asked for information. How to check patterns and what the law says about collecting them is covered in the guide to finding email addresses. How to tell the decision-maker from the administrator in larger firms is shown in the guide to the right contact person.

Staying on the right side of the law with public data

You may use publicly available company data for B2B outreach. The legal basis for processing names and business contact details is legitimate interests under Article 6(1)(f) UK GDPR. Recital 47 explicitly names direct marketing as a possible legitimate interest. Three things you must do for that. Document the source of each record and the balancing test showing why your interest prevails. Inform the person you are contacting, at the latest one month after collection or with the first contact if that comes sooner, where the data came from, who the controller is and that they can object. In practice a short note in the letter or in the signature naming the source and the right to object and pointing to your full privacy notice is enough. Act on objections immediately and keep a suppression list so nobody is contacted a second time.

The approach itself is governed by the Privacy and Electronic Communications Regulations (PECR). A live marketing call to a business is generally permitted as long as the number is not registered on the TPS or the Corporate TPS and the company has not asked you to stop, so screen every number before you dial. For email, PECR’s consent rule applies to individual subscribers, which includes sole traders and some partnerships. Corporate subscribers such as limited companies are as a rule outside that consent rule, but UK GDPR still applies to the named person, the email must say who you are and it must offer a simple way to opt out. Post remains the least problematic route for a first contact. A LinkedIn message only comes into play after connecting and should have a factual hook without a sales pitch. The details with examples are in the guide to GDPR-compliant lead generation and in the guide to cold outreach.

A weekly plan in five hours

Free lead generation usually fails because it gets left behind between client projects. A fixed weekly plan of five hours is enough for around ten usable leads a week with a contact and a first touch. Two of those hours are research and checking, the value you set in the calculator above.

Before the first Monday you need three lines of ideal customer profile, meaning the sector, region and size of the companies you want. Add one or two triggers such as a new incorporation or a job advert. A spreadsheet with the columns company, source, date, trigger, person, role, channel, status and follow-up date is enough for the list.

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The plan is deliberately small. Most people can sustain five hours a week over months. The only cash outlay is postage, around €40 a month for ten letters a week. After four weeks you have around 40 companies with a contact, 40 first contacts and the first conversations. After that you know which source delivers the most usable companies for your target group. From then on the Monday hour goes there only.

When free is no longer enough

The limit is the time you lack for conversations once the list is running. With two research hours a week you get to ten leads. If you need thirty, that is six to eight hours, or you hand off the research part. Then there is freshness. A self-built list goes out of date because contacts, registered offices and needs change and nobody has the time to re-check every row.

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My advice on this point is to keep to the order. First the free sources, because that is how you learn which companies buy. Then a tool for the part that eats the most time, meaning research and contacts. The AI agents at Leadscraper work with the same public sources listed in this guide. You describe your target group in words, the system researches matching companies including the contact, justifies each hit with the source and learns from your feedback which companies you pursue. You start with a free trial account, after that you pay on a credit basis only for the leads you actually retrieve. If you want to hand off the first approach as well, you can use Leadscraper Autopilot, which takes over everything from research to the first contact.

Conclusion

Generating B2B leads for free is easier than most people assume, because your customer base, Companies House, trade bodies, trade shows and job boards show their data openly. The work lies in the selection, the search for the contact and the weekly follow-up. Use the calculator above to work out what that work costs you, then you know at what price per lead a tool is cheaper than your time.

Start with one source and five hours a week, build the list along triggers and stick to the rules for phone and email. After a month you have real numbers on reachability and conversation rate. From then on every decision about budget rests on figures.

Frequently asked questions about free B2B leads

Where can I get free B2B leads?

Fastest from your own customer base, then from Companies House, Google Maps, chamber and trade association directories, trade show exhibitor lists, job adverts, procurement portals and LinkedIn search. The work lies less in finding the company than in finding the right contact.

Is Companies House data free to use?

Yes. Searching Companies House and viewing filings is free of charge, you get the legal form, registered office and the registered officers. Phone numbers and email addresses are not in the register, you have to add those from the company’s website.

Can I simply write to companies from public sources?

Processing business contact details rests on legitimate interests under UK GDPR, provided you document the source and purpose and tell people where their data came from. PECR governs the approach itself. Calls to businesses are permitted after a TPS and Corporate TPS check, marketing emails to corporate subscribers are generally outside PECR’s consent requirement but still need your identity and an opt-out, while post is the safest route for a first contact.

How many leads a week are realistic without a budget?

With two hours of research a week, around ten leads with a contact are realistic, with five pure research hours 20 to 25. The figure depends above all on how quickly you find the right contact.

Which free tools help with lead generation?

A spreadsheet for the list, Google Maps for the search, Companies House and the register portals for company data, LinkedIn for contacts and an email client with reminders for following up. For Google Maps there are tools that export a search into a spreadsheet. On LinkedIn you should steer clear of extensions of that kind.

Is LinkedIn worth it without Sales Navigator?

For finding individual contacts yes, for building whole lists no. LinkedIn gives no fixed figure, the limit kicks in with recognisably commercial use and resets at the start of the month. For ten companies a week it is usually enough if you check the companies first via the website and team page. The role holder there is usually more current than in purchased databases.