Buying a B2B Email Database in the UK: The Guide the People Selling Them Won't Write

This guide covers what it costs to buy a B2B email database in the UK per 1,000 records, whether you call it an email database, an email marketing database or a mailing list. It also covers which businesses PECR lets you email without consent, and six checks to run before you pay. We also count, trade by trade, how many UK businesses sit on the Companies House register, from 187,379 builders to 10,644 schools. Or skip the guesswork and test 100 free leads in your trade.

How we know. We compile UK B2B lead lists for a living, from Companies House, sector regulators and other public records and licensed providers. The per-trade figures on this page are our own pull of the Companies House register, not a vendor estimate. Prices, decay rates, bounce thresholds and the ICO rules are linked to their sources where they appear, so you can check each one yourself.

Email Database, Mailing List or Email Marketing Database: What You Are Actually Buying

Sellers use these names loosely, so judge what you are buying by the licence, not the label. A mailing list is usually rented: the broker sends your email and you never hold the addresses. An email marketing database is bought or licensed: you hold the records for a set term, often with limits on how many sends you make. Either way, under PECR the question is the same: is each address a corporate subscriber?

A rented mailing list. The broker keeps the data and sends on your behalf, or licenses it for a single send. You see the responses, not the file, so you cannot verify it, clean it or build a sequence on it.

A bought or licensed email database. You receive the records and hold them for the term the licence sets, which may be one use, several uses or longer. Before you plan a campaign, read the terms for limits on how often you can send and how long you can keep the data.

A CRM-ready B2B database. Company records that carry a registration number, such as a Companies House company number, alongside the email. The number lets you match each record to the register, see what kind of entity it is and refresh it later, rather than buying the whole file again.

The label does not change the law. The ICO’s electronic mail marketing rules apply to the sender, whichever of the three you buy.

What a UK B2B Email Database Really Costs

Whether a seller calls it B2B email data or an email marketing database, UK list brokers price it at roughly £275 to £350 per 1,000 records (RD Marketing). Budget sellers advertise from about 8p per contact, which is £80 per 1,000. Globally the benchmark is $300 to $1,000+ per 1,000 addresses, with per-contact prices from $0.03 to over $5 depending on how tightly you filter.

The sticker price is the wrong number to compare. What you are really paying is price divided by the records that actually deliver. Healthy bounce rates sit under 2%, and major email platforms restrict accounts above about 5% (TrueList). B2B contact data decays by 22.5% to 70.3% a year (Landbase), so a cheap file compiled last year can cost more per working record than a fresh one at a higher rate. Full tier detail is on our verified lead lists and pricing page.

A worked example. Take a budget file at 8p per contact, £80 per 1,000, compiled a year ago. At the low end of that decay range, about 225 of the 1,000 records no longer work, so you are paying roughly £103 for every 1,000 addresses that still deliver. At the high end, fewer than 300 still work, and the real price is about £270 per 1,000, close to what a broker charges for fresh data. The same sum is why a per-record verification date matters more than the headline rate on the price page.

Where to Buy a B2B Email Database or Mailing List: Five Types of UK Seller

There are five kinds of seller behind every “buy B2B email lists UK” result, and they differ on four things that matter more than headline price: how they charge, when each record was last verified, what licence you get, and whether they separate incorporated companies from sole traders. That last point decides what you can legally send. For the record, we build lists from public records and licensed providers, verified at the time you order.

1. Global SaaS contact platforms. Seat licences and monthly credits. Deep filters on job title and tech stack. Before you subscribe, ask how many UK small businesses they hold in your trade, and how many of those are sole traders.

2. UK list brokers. Priced per thousand records with single-use or multi-use licences. Good UK coverage; ask when the file was last verified and whether you are renting or buying it.

3. Budget bulk sellers. Per-contact pricing from about 8p. Verification is usually done once, when the file was compiled, so age is the hidden cost.

4. Build-to-order compilers. The list is assembled and checked when you order, filtered to your trade and area. This is where we sit: fresher data, smaller runs, and a sample before you pay.

5. DIY from public registers. Companies House and sector regulators are free and authoritative, but the registers hold no email addresses. Our guide to Companies House data, three ways covers the options.

Which type fits depends on the job. A one-off campaign to a defined set of limited companies suits a broker file or a build-to-order list, as long as you know the licence terms. Ongoing prospecting by job title suits a platform, if its UK coverage holds up in your trade. Mapping a whole market, and nothing more, can start free from the registers. Whichever you choose, ask for a sample before you pay and test it against the six checks further down this page. Want named providers rather than seller types? See UK B2B data providers compared, or compare UK B2B email database providers by source and price.

The Rules: PECR and UK GDPR on Bought Data

Buying a B2B email database is legal in the UK. Two sets of rules govern what you do with it. PECR covers the act of sending marketing email, and its key line is between corporate and individual subscribers. Under the ICO’s business-to-business guidance, you can email limited companies and LLPs without prior consent, as long as you say who you are and give a working opt-out. UK GDPR applies on top whenever a record names a person.

So the first question for any bought file is not “is it legal?” but “who is on it?”. A record for a limited company with a role address such as info@ sits at the lighter end of the rules. A record for a sole trader, or a named person at any business, brings consent or a documented lawful basis into play.

Corporate subscribers: no prior consent

Limited companies, LLPs, Scottish partnerships, and government bodies. You can send marketing email without consent if you identify yourself and offer an opt-out. A named person at that company is still personal data, so you need a lawful basis under UK GDPR (usually a documented legitimate-interests assessment), you must tell them where you got their details, and you must honour opt-outs.

Individual subscribers: consent first

Sole traders and unincorporated partnerships in England, Wales and Northern Ireland are treated like consumers. They need prior consent. The soft opt-in never applies to a bought list, because it only covers details you collected yourself. Consent on a bought list counts only if it specifically named you; “trusted partners” wording does not.

What enforcement actually looks like

In January 2026 the ICO fined ZMLUK Ltd £105,000 for marketing sent on bought third-party data: 67,772,285 emails. The consent named 361 “partner” companies, so it was not specific and not valid. Volume made the breach bigger; the consent made it a breach.

Is mass emailing illegal? No. Sending a lot of email is not the offence. Subscriber type, consent where it’s required, a clear sender identity, a working opt-out and a lawful basis for named contacts decide whether a campaign is compliant. This section sets out what the ICO guidance says; it isn’t legal advice for your campaign.

How Many UK Businesses Are on the Register, by Trade

Companies House lists 187,379 active registered entities under the building SIC codes, and 574,000 across the eleven trades below (counts from the free Companies House data product). A match to an active company number points to a registered business rather than a sole trader, because sole traders are not on the register. That is where a PECR-safe cold list starts. Here is the count for each trade from our own pull of the register.

Source: B2B Data Scout analysis of the Companies House register, active companies by SIC code, July 2026. The count covers every active registered entity type for each SIC code. Limited partnerships are not corporate subscribers under PECR, and UK GDPR still applies to named contacts, so a register match is where your checks start, not where they end.

Builders and restaurants carry the largest tail of unincorporated businesses outside the register. A broker list for those trades will contain many sole traders, and every one of them needs consent before you email. Browse UK email lists by profession to see sample records for each trade, or pick a trade in the table to go straight to its list.

The professional trades work the other way. Solicitors, dentists, doctors and care homes also answer to sector regulators, so a list for those trades can be checked against more than one public register. That makes it easier to confirm each business exists and is trading, and to see what kind of entity it is, before you decide whether it needs consent.

The Quality Problem Nobody Prices In

A bought database is a snapshot, and B2B contact data decays by 22.5% to 70.3% a year. People change jobs, firms close and domains lapse. That decay never shows on the invoice. It shows up later as bounces, spam-trap hits and a sending account that gets restricted. Three numbers decide whether a list is worth sending.

1. Decay. Even at the low end of that range, a database compiled twelve months ago is nearly a quarter dead on arrival.

2. Bounces. Under 2% is healthy. Above about 5%, major email platforms restrict accounts. A stale list can get your sending paused in a single campaign.

3. Spam traps. Roughly 0.01% of purchased-list addresses are traps, and one hit can blocklist a domain. Most mainstream email platforms ban purchased lists in their terms.

The practical rule: never send a bought database from your main company domain. Verify every address first, and send from a separate, warmed-up domain so one bad file can’t take your day-to-day email down with it. Send to a small batch first and watch the bounce rate. If it climbs towards 5%, stop and clean the list before sending any more.

Six Checks Before You Pay

1. How many are incorporated? Ask what share of records match an active company number, and ask them to show it. Trades heavy in sole traders need the most scrutiny; see the per-trade table.

2. When was each record verified? A compile date for the whole file is not enough. With decay running at 22.5% a year or more, you want a check date per record.

3. Where did the data come from? You have to tell recipients where you got their details. If the seller can’t state the source, you can’t either.

4. Single-use or multi-use? Many broker files are licensed for one send. Know whether you are renting or buying before you plan a sequence.

5. ICO-registered, with consent records? Check the seller is registered with the ICO, and for any individual subscribers, ask for consent records that name your company.

6. What if it bounces? Get the replacement guarantee in writing, with a time window. A seller that won’t put accuracy on paper is telling you something.

When Buying a Database Is the Right Call, and When It Isn’t

A bought database is a fair tool for some jobs and the wrong one for others. The deciding question is the one the ICO’s business-to-business guidance turns on: are your targets corporate subscribers, who can be emailed without prior consent, or individuals, who cannot?

Buy a database when:

• your targets are mostly limited companies and you need broad coverage of a defined trade;
• you are running a one-off campaign, or mapping your total market;
• you will use it for telemarketing or post, where PECR’s email rules do not apply in the same way;
• you will verify every address before sending and use the data within weeks, not months.

Don’t buy one when:

• the trade is dominated by sole traders or partnerships, who need consent first (see the rules above);
• the seller cannot show where the data came from and when each record was checked;
• you plan to send from the same domain your invoices come from;
• you expect the file to stay accurate beyond a quarter, or timing matters more than coverage. A static file cannot tell you when a business needs you; a trigger signal can.

Buy It Fresh, Not From a Warehouse

The weak point of every pre-compiled database is the compile date. The data was true once, then it sat in a warehouse, and you are buying the gap between then and now. A business that has just registered, changed hands or failed an inspection is easier to reach than the same business picked from a file at random.

When buying is right, buy it fresh. We build verified lead lists to order from public records and licensed providers, filtered to your trade and area. You can read how we keep B2B data compliant before you order. Orders under 10k leads turn around in one business day, and monthly subscriptions are 20% off.

• Essential, 5p per lead: business name, domain, verification status, Google rating and Business page.
• Growth, 8p per lead: adds verified email, direct phone and company social pages.
• Complete, 12p per lead: adds owner name, owner email, direct mobile where available, LinkedIn URL where found.

Every list carries the same guarantee: 95%+ accuracy or a free replacement. Tell us within 14 days. See lists and pricing; prices per lead work out at £50 to £120 per 1,000.

Frequently Asked Questions

Is it legal to buy a B2B email list in the UK?
Yes. Buying is not banned; the rules cover how you use it. UK GDPR applies wherever a record identifies a person, and PECR governs the sending. Emailing limited companies needs no prior consent if you identify yourself and offer an opt-out; sole traders need consent.

How much does a B2B email database cost in the UK?
UK brokers typically charge £275 to £350 per thousand records, budget sellers advertise from about 8p per contact, and global platforms run $300 to $1,000+ per 1,000. Our verified lists are 5p, 8p or 12p per lead (£50 to £120 per 1,000), built to order.

Where can I get a B2B database in the UK?
Five routes: global contact platforms, UK list brokers, budget bulk sellers, build-to-order compilers, or building your own from Companies House and sector registers (free, but no emails). They differ on pricing model, licence, verification date and whether they separate incorporated from unincorporated businesses.

Is mass emailing illegal in the UK?
Volume alone is not the issue. What matters is subscriber type, consent where it’s required, clear identification of the sender, a working opt-out, and a lawful basis under UK GDPR for named contacts. In January 2026 the ICO fined ZMLUK Ltd for sending tens of millions of emails on bought data without valid consent.

Can I email sole traders from a bought list?
Not without consent. Sole traders and unincorporated partnerships in England, Wales and Northern Ireland are individual subscribers under PECR, and the soft opt-in never applies to a bought list. Consent is only valid if it specifically named you, so check which trades the list leans towards.

How accurate are bought email databases?
B2B contact data can decay by 22.5% to 70.3% a year, so age matters more than size. Healthy bounce rates are under 2%, and above about 5% email providers may restrict your account. We guarantee 95%+ accuracy or a free replacement, and the 100-lead sample lets you test before buying.

What is the difference between a mailing list and an email database?
A mailing list is usually rented: the broker sends for you and you never hold the addresses. An email database is bought or licensed: you hold the records for a set term, often with limits on sends. Either way, PECR asks the same question of each address: is it a corporate subscriber, or an individual who needs consent?