co.uk or .uk? Which one a UK business should actually register

Register the .co.uk. For a business serving UK customers it remains the address people expect, type, and half-remember correctly: registry statistics show roughly six .co.uk registrations for every direct .uk, twelve years after the shorter form launched. If the matching .uk is unregistered and your budget can absorb another £7–£16 a year, register that too and point it at your main site — not because you have any special claim to it (you don’t; that window closed in 2019), but because it’s cheap insurance against someone else picking it up. Direct .uk makes sense as your primary domain only in specific situations: the .co.uk you want is taken or reads badly, or your brand already leans on short, bare domains. The rest of this piece is the evidence for that recommendation — including the places where the evidence is thinner than the domain industry likes to admit.

What’s the actual difference between .co.uk and .uk?

Structurally, .uk is the United Kingdom’s country-code top-level domain, and .co.uk is a namespace one level down inside it. Both are run by the same registry: Nominet, the IANA-delegated manager of .uk. When you register example.co.uk you’re registering a third-level name; example.uk is a second-level name under the same roof. Until 10 June 2014, that second level was closed — a UK business simply could not register example.uk — which is why the country standardised on .co.uk in the first place and why so much British muscle memory is built around it.

The .uk namespace is a small family, and the branch you pick carries different rules. Under Nominet’s Rules of Registration, .co.uk is designated for commercial use but is open to anyone — no incorporation, no UK presence, no paperwork. .org.uk is intended for not-for-profits and is likewise open. The others are genuinely restricted: .me.uk is limited to natural persons (actual humans, not companies), .ltd.uk and .plc.uk require a current Companies House incorporation as a private or public limited company respectively, .net.uk is reserved for ISP infrastructure, and .sch.uk is for UK primary and secondary schools. In practice .ltd.uk, .plc.uk and .net.uk are legacy corners of the namespace — our reading, not Nominet’s official line, is that they saw little uptake precisely because .co.uk was open to everyone with no incorporation requirement, so it became the de facto commercial default and never let go.

On price, the two are a wash. At mainstream UK registrars, both .co.uk and direct .uk renew at roughly £7–£16 a year (checked late July 2026 — domain pricing moves, so verify before you rely on it). You will see first-year promotions far below that — a penny, a pound — and those are real, but they’re teasers: the renewal is often ten times the promo or more, so compare renewal prices and ignore the headline, a trap covered in detail in our guide to first-year vs renewal domain pricing. For context, Nominet’s wholesale fee to member registrars is £3.90 a year — that’s the registrar’s cost, not a price any business pays directly, but it explains how near-zero promotional pricing can exist at all.

Everything else — DNS behaviour, email, SSL, the dispute system, the registry underneath — is identical. The real differences are three: length, incumbency, and one eligibility detail we’ll get to. None of them is technical.

Didn’t .co.uk owners get first refusal on the matching .uk?

They did — past tense — and this is the single most misunderstood fact in this whole decision.

When Nominet opened direct .uk registration on 10 June 2014, it didn’t throw the shorter names open to a land-grab. It ran a five-year “Rights of Registration” scheme: if you held a qualifying third-level domain, the matching direct .uk was reserved for you. Qualifying meant the domain was registered before 23:59 (UK time) on 28 October 2013 in one of six namespaces: .co.uk, .org.uk, .me.uk, .net.uk, .ltd.uk or .plc.uk. Where more than one qualifying name matched — say a .co.uk and an .org.uk with the same string — priority ran to the .co.uk holder first, then .org.uk, then .me.uk. For five years, nobody else could touch your matching .uk.

That window expired at 06:00 BST on 25 June 2019. The unclaimed names — over 1.8 million of them — were then released in two stages: five alphabetical batches from 1–5 July 2019, one going live each afternoon, followed by general availability for whatever remained from 8–12 July 2019. Nominet’s own FAQ on the scheme is blunt about the aftermath: a rights holder who didn’t act by the deadline “no longer has the rights to that domain name.”

So the situation today, stated plainly: a .co.uk owner has zero preferential claim on the matching .uk. None. It is first-come, first-served, open to anyone on Earth. If your matching .uk happens to be unregistered right now, that isn’t Nominet holding it for you as a courtesy — it’s an open name that someone else could register this afternoon. The belief that some residual protection lingers is durable, and it is simply wrong — a fact that does more work than any other in the “should you register both” question below.

Which one do UK businesses actually use?

Overwhelmingly .co.uk — though the gap is closing, slowly.

Nominet publishes monthly registration tables, so this doesn’t have to be guesswork. As of June 2026 the .uk family stood at roughly 10.5 million domains under management, split about 8.59 million .co.uk against about 1.46 million direct .uk. That’s a ratio of roughly 5.9 to 1 — the single most decision-relevant number in this article, and the reason the recommendation at the top reads the way it does.

The trend is more interesting than the snapshot, and it cuts against the lazy version of this story in both directions. .co.uk is genuinely contracting: about 9.15 million in January 2023 to about 8.59 million in June 2026, a fall of roughly 6%. Direct .uk has grown over the same stretch, from about 1.36 million to about 1.46 million, up roughly 8%. So the ratio has tightened — from about 6.7:1 to about 5.9:1 — but it took three and a half years to move that far, which is not the stampede the shorter form’s advocates once predicted. What is equally untrue is that direct .uk is a dead letter: new second-level registrations in June 2026 ran roughly 62% ahead of June 2025, and the .uk namespace as a whole grew about 3% year on year after a soft patch in 2025. Read it honestly and it’s a slow, real drift rather than a switch — which is why the sensible move is to register the .co.uk and hold the .uk, not to bet the brand on either being the future.

What about consumer perception? Here’s where honesty matters more than a tidy statistic. You will run into confident claims that UK consumers “prefer” or “trust” .co.uk by some dramatic margin — one particular figure has circulated in domain-marketing blogs for years, attributed vaguely to registry research. We went looking for the study behind it and could not find one: no methodology, no publication, no primary source, just the same number quoted from blog to blog. Nor could we find any independent, methodologically described survey comparing UK consumer trust of .co.uk against .uk. The truthful answer is that the perception question is short on real data in either direction. What is not short on data is the base rate: when a customer half-remembers your web address and types it from memory, a namespace where .co.uk outnumbers direct .uk almost six to one makes .co.uk much the likelier guess. That’s an inference from what’s registered, not a measurement of what people type — but incumbency is the only solid perception evidence there is here.

Can anyone register a .uk, or do you need to be British?

Anyone, anywhere, can register both .co.uk and direct .uk. There is no citizenship test, no UK-company requirement, no equivalent of the residency gate that .eu imposes on registrants — the rule that famously stripped UK holders of their .eu domains after Brexit. The .uk namespace has no such rule to trip over, and as far as we can find, Brexit changed nothing about .uk eligibility — we found no sign that .uk ever carried a residency requirement to lose in the first place.

There is, however, one genuine asymmetry, and it’s easy to get backwards, so here it is precisely. Registrants of direct second-level .uk domains who live overseas must provide an address for service in the United Kingdom, carried on either the registrant or the admin contact; in practice registrars also accept Guernsey, Jersey and Isle of Man addresses. This requirement shows up consistently in registrars’ .uk legal terms (GoDaddy’s, among others) rather than in any clause we could locate in Nominet’s own published Rules of Registration or registrant terms, so treat the fine detail as registrar-documented rather than registry-published — registrars differ, for example, on whether a PO Box will be accepted. Crucially, it applies only to direct .uk. The older third-level namespaces — .co.uk and .org.uk — carry no UK-presence requirement at all, for anyone.

For a UK-based founder this is moot: your own address qualifies and you’ll never notice the rule. For a founder outside the UK targeting the British market, it quietly strengthens the case for .co.uk — the extension that says “UK” to customers with zero paperwork on your side — or means arranging a UK address for service if you specifically want the bare .uk. If you’re weighing .uk against other national extensions, our guide to European country-code domains for founders compares the registries’ rules side by side; .uk sits at the open end of the spectrum.

Whose name should the domain actually be in?

This gets skipped in every comparison of the two extensions, and it matters more than the choice between them. Nominet treats the registrant as the legal owner of a .uk domain — not whoever set it up, not whoever pays the invoice, not the account the domain happens to sit in.

If you’re a sole trader, that’s simply you, under your own legal name, and there’s nothing to get wrong. If you’ve incorporated, register the domain in the company’s name, not a director’s personal one. Putting the company’s domain in a founder’s personal name is the commonest ownership trap in UK small business, and it stays invisible until precisely the moment it’s expensive: a co-founder leaves, an acquirer’s due diligence asks who owns the brand, or the person named on the record becomes unreachable. Correcting it later is a registrant change at the registry — a distinct process, not a contact-details edit — and in general only the registrant can authorise the significant actions on the name. The same logic applies with anyone who registers a domain “for” you; who should own the domain, you or your web agency covers that version of the problem.

Put real details in, too. Nominet runs a data-quality validation process on .uk registrations, and a domain whose registrant details can’t be verified can be flagged and held pending correction — a first-time registrant who typed a half-finished address will otherwise have no idea why their new domain isn’t behaving. It’s a five-second precaution at checkout and a genuine nuisance to unpick afterwards.

Does either one rank better in UK search?

No — and this is worth saying deflationarily, because SEO is the justification people reach for when they’ve already decided emotionally.

Google’s own documentation says that country-code TLDs “provide a strong signal to both users and search engines that your site is explicitly intended for a certain country,” and that ccTLD sites are geotargeted automatically, with no manual Search Console configuration needed. Two things follow. First, both .co.uk and direct .uk get this treatment — technically .uk is the ccTLD and .co.uk a second level within it, and both say “United Kingdom” to Google. We found no statement from Google differentiating the two; claims of explicit parity attributed to individual Googlers circulate without citations, so we won’t lean on them, but nothing credible points the other way either. Second — and this is the part the sales pages skip — geotargeting is not a free ranking boost. Google’s own wording is that targeting a country “can improve your page rankings in the target country, but at the expense of results in other locales or languages.” That’s a trade-off, not a cheat code, and because it applies identically to .co.uk and direct .uk, it cannot be a reason to pick one over the other.

So the SEO answer is: pick either, they behave the same, and neither is a rankings cheat code. The same deflationary logic applies to most extension-and-rankings folklore, which we unpack in do exotic TLDs hurt SEO? Choose between .co.uk and .uk on brand, incumbency, eligibility and cost — the search engines are indifferent.

Should you register both?

If the name is distinctive and the business is real: probably yes — but be honest with yourself about why.

The case for registering both is not “protecting your right to the matching name.” As of 25 June 2019 you have no such right; the rights period is over and nothing replaced it. The case is insurance. If you hold example.co.uk and leave example.uk open, anyone can register it — a competitor, a drop-catcher, or — the scenario worth the insurance, though we found no data on how often it actually happens — someone who would rather your customers couldn’t tell their address from yours. At £7–£16 a year per name at renewal, holding both costs less than a business lunch annually. Against the tail risk of your customers receiving convincing email from “your” domain, that’s cheap. The full framework for when defensive registrations earn their keep — and when they’re just recurring anxiety spend — is in should you register multiple domains?

Mechanics, briefly: pick one as canonical, serve the site there, and 301-redirect the other. Don’t split your presence across both, and don’t send email from both — one domain is the brand, the other is a bodyguard.

When to skip the second name: the project is a side project, the budget genuinely can’t spare it, or the name is so generic that owning two spellings of it defends nothing. Insurance is optional. What isn’t optional is knowing you’re uninsured — which brings us to what happens if the other name falls into the wrong hands.

What happens if someone else takes the other one?

First, the uncomfortable part: nothing automatic protects you. Registration is first-come, first-served, and merely owning example.co.uk first is not, by itself, grounds to take example.uk off a later registrant. If they’re using it legitimately — a different business that happens to share the name — you likely have no remedy at all, only a negotiation.

If the use is abusive, there is a real backstop, but note which one: UDRP does not apply to .uk. The ICANN dispute policy that governs .com and other generic TLDs has no jurisdiction here. Instead, .uk disputes go through Nominet’s own Dispute Resolution Service (DRS) — with one change recent enough that most write-ups still have it wrong. Since 7 July 2026, WIPO administers the DRS on Nominet’s behalf, and new complaints must be filed through WIPO’s website rather than Nominet’s. The policy, the panel of experts, the mediation stage and the fees are all unchanged and all still Nominet’s; only the filing venue moved. Cases opened before that date stayed with Nominet. To win a DRS case you must prove two things. One: you have Rights in the name — a registered trademark or demonstrable goodwill, which is exactly the groundwork covered in trademark basics before you register. Two: the registration is Abusive under the DRS Policy — registered or acquired in a manner that “took unfair advantage of or was unfairly detrimental to” your Rights, or used in such a manner. That “or” is worth noticing: the DRS standard is disjunctive, unlike UDRP, which requires proving bad-faith registration and use. On paper that makes the DRS somewhat more claimant-friendly than its .com counterpart. There’s even a repeat-offender rule: a respondent found to have made abusive registrations in three or more DRS cases within the previous two years faces a rebuttable presumption of abuse.

The process runs: complaint, then a response within 15 working days (the DRS counts working days throughout, so that’s about three calendar weeks), a short reply, then free informal mediation — genuinely free, and positioned to end the dispute before anyone pays a fee. The costs branch from there, and the branch matters. If the respondent never answers at all — the classic squatter — there is no mediation, and you can ask for a summary decision at £200. If they do answer and mediation fails, either side can pay for a full Expert Decision at £750, with an appeal at £3,000 and a ten-working-day deadline to lodge it. Practitioner estimates put a fully contested case at roughly 8–12 weeks end to end.

So the DRS is a functioning system with real teeth — but read the requirements again. Rights plus abuse, evidence, weeks of process, and £200 to £750 depending on whether the other side bothers to reply. That is cheaper than most people assume, and still a great deal more effort than the £7–£16 a year it would have cost to own the name in the first place. If you’re already in this situation — someone is sitting on a name that’s recognisably yours — the wider playbook, including the non-DRS options, is in someone registered your business name as a domain.

So which should you register?

The short version, case by case:

• UK business, .co.uk available: register the .co.uk as your primary. It’s what customers guess, it’s the six-to-one incumbent, and it costs the same. Add the matching .uk as a redirect if the budget allows.
• The .co.uk is taken or ugly, the .uk is free: direct .uk is a perfectly good primary. Google treats it identically, it’s shorter and cleaner, and nearly 1.5 million registrations is a real namespace, not a gimmick — one that’s currently growing faster than .co.uk is. You’ll spend a little more time saying “just dot-uk, no co” out loud — price of the minority choice.
• Non-UK founder targeting the UK: lean .co.uk. It carries no UK-presence requirement whatsoever, while direct .uk needs a UK address for service if you’re overseas. Same signal to customers, less admin.
• Brand already built on short, bare domains: direct .uk keeps the aesthetic consistent, and the redirect from .co.uk catches the traditionalists.
• UK charity or not-for-profit: .org.uk is the sector convention and, despite the name, carries no eligibility check at all — anyone can register one. Weigh it against a plain .org, which is the international convention and by far the larger namespace; is a .org domain worth it? takes that side of the question.
• Global product where the UK is one market of many: question the premise — a UK ccTLD frames you as British, which is either the point or a constraint. If the ambition is global, the calculus shifts toward when you genuinely need the .com, or the broader question of which TLD you should use at all.

And whichever you pick: if the matching counterpart is open and the name matters to you, close the loop. The rights period that once held it for you ended in June 2019, and nobody is holding it now.

All of this, of course, assumes you already have the name — and for most founders the name is the hard part, not the extension. If you’re still hunting, that’s what Domain Yoga is for: describe the business, and a single search returns around 250 name ideas, each checked for availability and ranked for brandability, for $2–$5. No subscription, and credits never expire. Bring back a name you love; the .co.uk-versus-.uk call takes about five minutes once you have it.