.co.uk vs .com: Which Domain Should a UK Business Register?

If you run a business in the UK, the question comes up as soon as you search for a domain: should it end in .co.uk or .com? The honest answer is that neither is wrong, and the better choice depends on who your customers are, where you want to grow and what is actually available.

This guide compares the two on the points that matter: how customers perceive them, what Google says about country-code domains, what expansion would mean, and what you should do if one is taken. It ends with a simple decision rule.

The short answer

What each one tells a customer

A .co.uk address signals a UK business. That can reassure local customers who want to know they are dealing with someone they can contact and, if necessary, hold to UK consumer rules. A .com has no country attached, which suits a business that wants to be seen as international, and many people type .com by habit.

Habit is the real risk. If you choose .co.uk and a different business owns the same name as a .com, some visitors will reach them by mistake. If you choose .com and your customers are all in the UK, you lose the small signal that the .co.uk would have given. Neither problem is fatal, but you should look at both before you commit.

What Google says about country-code domains

Google's guidance on multi-regional sites says country-code domains are tied to a specific country and give a strong signal to users and search engines that a site is intended for that country. Generic domains such as .com do not carry that signal, so Google advises using other methods, such as hreflang annotations or a clear site structure, if you want to target a country with one.

That is useful context, but keep it in proportion. Google's SEO Starter Guide advises picking a domain based on business needs rather than search optimisation, and notes that the top-level domain matters mainly when you are targeting a specific country. In other words, a .co.uk helps most when your audience is the UK, and it is not a ranking trick. The same is true for .com.

Planning for growth

Ask where you expect to be in three years. If you may sell overseas, a .com is easier to carry into new markets, because you will not need to explain a UK-specific address to customers elsewhere. If you only ever plan to serve a town or a region, a .co.uk is perfectly enough, and the cost of moving later is small compared with the cost of building your brand around a name you cannot use.

Cost, renewals and the practical details

• Compare the first-year price and the renewal price for each extension with the registrar you plan to use. Prices differ by registrar and change over time.
• Check what is included: privacy, email, redirects and any add-ons already in the basket.
• Keep both domains under the same registrar account so they renew together.
• Point the second domain at the first with a permanent redirect so there is a single address customers see.

The defensive domain strategy guide explains which extra domains are worth buying and which are a waste of money, and the registrar comparison helps you choose where to register them.

If your preferred name is taken

Sometimes the .co.uk is free and the .com is owned by someone else, or the other way round. Look at what the other site is. A dormant or parked page is very different from an active business in your sector. If it is a competitor or could plausibly be confused with you, treat that as a serious reason to reconsider the name, not just the extension.

Your company name and your domain are separate decisions. A limited company name has to meet the Companies House rules, and an available domain does not mean the company name or a trade mark is free. Run the legal checks described in the four-database clearance workflow as well.

A simple decision rule

• If your customers are in the UK and the .co.uk is available, take it.
• If you may sell abroad within a few years, prefer the .com when you can get it.
• If you can afford both, register both and redirect one to the other.
• If only one is available, check who owns the other before you commit to the name.
• Whichever you choose, say it aloud and ask someone to type it, to check the address is easy to get right.