.co.uk vs .uk: which should you use?
The UK has two main domain extensions, and people often wonder which is better. The short answer is that both are administered by Nominet, neither has a built-in advantage for search, and the right choice usually comes down to brand and what is already taken.
The two main UK extensions
For years, .co.uk was the natural home for British businesses and remains the most widely recognised UK extension. In 2014 Nominet introduced the shorter second-level .uk, so that a business could register a name directly as name.uk rather than name.co.uk. Both sit under Nominet and work in the same way day to day.
Who can register each
Both .co.uk and .uk are open to register without needing to prove a UK presence, although Nominet requires valid registrant details and a UK address for service on .uk registrations. In practice, individuals and businesses worldwide hold UK domains.
Matching pairs and the old rights window
When .uk launched, holders of the matching .co.uk were given a period of time in which they had the right to claim the equivalent .uk name. That reserved window closed in 2019, after which any unclaimed .uk names were released for general registration. The upshot today is simple: a .uk name may be available even if the .co.uk is taken, and vice versa.
Is one better for SEO?
No. There is no inherent search advantage to choosing .uk over .co.uk or the other way around. Search engines treat both as standard UK domains. The decision should be based on brand recognition and availability rather than any hoped-for ranking benefit.
What it means if you own one half of a pair
If you own the .co.uk but not the .uk, or the .uk but not the .co.uk, you own only part of the set. Owning both halves of a matching pair is generally more valuable and more secure, because it prevents someone else from operating on the version you do not control. For this reason buyers, including us, are often particularly interested in complete matching pairs.
Own a .co.uk, .uk or a matching pair?
If you are thinking of selling, tell us about it for a free, no-obligation indication. Owners only, in confidence.
Submit your domainThis guide is general information only and is not legal, financial or tax advice. Please take professional advice before acting. Any purchase or sale is subject to our Terms & Conditions, and any valuation or figure is indicative only and never a binding offer.