How to choose a domain name for your UK business (.co.uk vs .com)

Your domain name goes on your van, your invoices, your Google Business Profile and every business card you ever hand out. It takes ten minutes to pick and years to change, so it is worth getting right first time. This guide covers which ending to choose (.co.uk, .uk, .com or something newer), how to pick a name people can actually remember, what to do if the one you want is taken, and the ownership and renewal details that catch small businesses out.

What a domain name actually is

A domain name is the address people type to find you, like smithplumbing.co.uk. You do not buy it outright: you register it for a period (usually one to ten years) with a registrar, and you keep it as long as you keep renewing. The domain is separate from your website and your hosting. You can move either of those and keep the same address, which is exactly why the domain is the most valuable part of the whole setup.

.co.uk, .uk, .com or something else?

The ending (the “top-level domain”) matters more for trust and habit than for Google. Here is how the common options compare for a UK business.

Both .co.uk and .uk are run by Nominet, the UK registry. Google treats a .co.uk as a signal that you serve the UK, but it does not rank one ending above another on its own. Our plain advice: a UK trade, salon, clinic or local service should take the .co.uk as the main address, and the matching .uk and .com if they are available and cheap.

When to buy more than one

You only ever need one main domain. Everything else you register should simply point at it (a “redirect”), so that someone typing the wrong ending still lands on your site. Reasons to hold more than one:

• Protecting the name. If you have smithplumbing.co.uk, a rival with smithplumbing.com or smith-plumbing.co.uk will confuse your customers. A few pounds a year prevents it.
• Common misspellings. If people regularly get your name wrong over the phone, register the obvious variant.
• A rebrand in progress. Keep the old domain for a year or two and redirect it, so old links and printed material still work.

In our experience most small businesses need two or three domains at most. Beyond that you are paying renewals on addresses nobody types.

Rules for a good name

You will say your domain out loud hundreds of times: on the phone, at the counter, at networking events. Test every candidate by reading it to someone and asking them to write it down.

• Keep it short. Two or three words at most. Fewer characters means fewer typos.
• Make it say-able. If you have to spell it or explain it (“that is plumbing with a z”), it is wrong.
• Avoid hyphens and numbers. People forget the hyphen and do not know whether “4” is a digit or a word. Use them only if the plain version is genuinely gone and you have no better option.
• Match your trading name. The closer the domain is to the name on your signage, the less you have to explain.
• Avoid trademarks. Do not include someone else’s brand, even as a joke or a “compatible with” hint. It can cost you the domain and more.
• Do not box yourself in. “romfordboilerrepairs.co.uk” is fine until you open a second branch or start fitting bathrooms.

Check Companies House and the trademark register

A domain being available does not mean the name is free to use. Two quick checks save real trouble later.

1. Companies House. Search the free register for your proposed name. If a company with a very similar name is already trading in your area and your trade, pick something else, even if the domain is free. You cannot register a company name that is “too like” an existing one anyway.
2. The UK trademark register. The Intellectual Property Office has a free search tool. Look for registered marks in your class of goods or services. A registered trademark holder can force you to give up a domain that infringes it, long after you have printed everything.

What to do if your name is taken

It happens constantly, especially in .co.uk. Work through the options in this order.

1. Try a sensible variation. Add what you do (smithplumbingservices.co.uk), or where you are (smithplumbingessex.co.uk). Adding the town or trade often helps local search as well, as long as the result is still short and say-able.
2. Try a different ending. If the .co.uk is gone but the .uk is free, that can be a perfectly good main address.
3. Find out who owns it and whether it is in use. Visit the address. If it is an empty page or a “this domain may be for sale” notice, the owner may sell. A WHOIS lookup will often give a contact route, or your registrar can make an enquiry for you. Agree a price in writing and use a proper transfer, never a cash deal on trust.

Who should be the registrant

This is the point that matters most and is most often got wrong. Every domain has a registrant on its WHOIS record. That is the legal owner. It must be your business (your limited company, or you personally if you are a sole trader), with an email address you control as the contact.

It must never be your web agency, a freelancer or a marketing company. If they hold the registration, they hold your business’s address, and when the relationship ends you are negotiating for something you thought was already yours. We cover how to check and fix this in Do you actually own your website?.

It is fine for an agency to manage the domain day to day, renew it, and set up the technical records, as we do for clients who register through us. Managing and owning are different things.

Privacy, renewals, email and moving

WHOIS privacy

The WHOIS record is public. Without a privacy service your name, address and email are visible to anyone, which mainly means spam and scam renewal letters. Most registrars offer privacy; some charge for it. We include it free.

Auto-renew, and a second contact

Domains expire quietly. A missed renewal email (old address, spam folder, the person who set it up has left) and the site and email go dark, then the domain is sold on. Turn on auto-renew, keep a working payment card on the account, and put two contact addresses on it, one of which is not tied to the domain itself. Registering for several years at once is cheap insurance for your main address.

Email on your own domain

Once you own smithplumbing.co.uk, use it for email: hello@smithplumbing.co.uk rather than smithplumbing2019@gmail.com. It looks established, it is harder to impersonate, and if a staff member leaves you keep the inbox. Your web host, Google Workspace or Microsoft 365 can run the mailboxes.

Moving a domain later

You are never stuck with the company you first registered with. A domain can be transferred between registrars, and the process is designed to keep the site and email running throughout.

• .uk and .co.uk transfers use a simple “IPS tag” change: your current registrar sets the tag to the new one, and the domain moves, usually within a day. No code is needed.
• .com and most others need an authorisation code from the old registrar and a confirmation email, and take a few days.

Before any transfer, note down your DNS records (the settings that point the domain at your site and email) so they can be recreated. Our hosting guide explains what a good host should handle for you here.

What it costs

Domains are one of the cheapest parts of being online. At WebProud a .co.uk or .uk starts from £9 a year, with WHOIS privacy and DNSSEC (a protection against your domain being hijacked at the DNS level) included free, and transfers are free when you host with us. .com prices vary by registrar and have risen in recent years, so compare before you buy, and be especially careful with the newer endings, where a cheap first year can be followed by a much higher renewal.

Be wary of “free domain” offers bundled with hosting or a site builder. The domain is often registered in the provider’s name, or the renewal is priced to make up for the free year.

Quick checklist

• Main address is a .co.uk (or .uk), with the .com held if it is free.
• Short, say-able over the phone, no hyphens or numbers.
• Checked against Companies House and the trademark register.
• You are the registrant, with your own email on the record.
• WHOIS privacy and auto-renew switched on, two contact addresses, card up to date.
• Business email set up on the domain.
• Logins written down somewhere safe.

Where to start

Write down three candidate names, read each out loud to someone, and check the .co.uk, .uk and .com for each. Run the Companies House and trademark searches on your favourite, then register it in your own name and switch on auto-renew.

If you would like us to check a name, register it for you, or move a domain that is currently in someone else’s name, get in touch. We reply within one working day and offer a free 20-minute scoping call. Domain and hosting prices are on our pricing page, and once the name is sorted, our website launch checklist covers everything that comes next.