Guide
How to choose a WordPress theme for your site
Choose a WordPress theme that is lightweight, regularly updated, mobile friendly, compatible with the block editor and well supported, then check it against your content, not just its demo. A good theme gives you structure and style; plugins add features. Test any candidate on a staging copy or a fresh install before you commit your content to it.
Start here
What a theme does and does not do
A WordPress theme controls how your site looks and how its pages are laid out: the header, menus, fonts, colours, blog layout and footer. It does not hold your content. Your pages, posts and images live in the database, so changing theme changes the appearance of the same content. That is both a comfort, because a theme is not a permanent commitment, and a warning, because a change can alter the layout of every page.
Themes come in several types. A classic theme uses PHP templates and the Customizer. A block theme, sometimes called a full site editing theme, lets you edit headers, footers and templates visually with the block editor. Multipurpose themes bundle dozens of demo sites and many options. Lightweight starter themes provide a clean base to build on. Each has a place, and the right one depends on how much you want to customise and how you like to work.
It also helps to say what a theme should not do. Themes should not be the home of important features, such as custom post types or contact forms. If a feature disappears when you change theme, it was tied to the theme, and you will have to rebuild it. Features that you need long term belong in plugins, so they survive a redesign.
Cost
Free themes or paid themes?
Free themes
- Available from the official theme directory
- Reviewed against WordPress guidelines
- Good for blogs and simple sites
- Support usually via a public forum
- Some are very lean and fast
Paid themes
- Often include more layouts and options
- May include dedicated support and documentation
- Usually need a yearly licence for updates
- Can be heavy if they bundle many features
- Buy only from the developer or a trusted marketplace
Criteria
What to look for in a theme
Speed
Test the demo with a speed tool on a phone. A beautiful demo that loads slowly will not get faster with your content.
Mobile design
Most visitors use phones. Open the demo on one and check menus, buttons and text size.
Update history
Look for recent updates and compatibility with the current WordPress version.
Support
Read the support forum. Are questions answered, and how quickly?
Block editor support
A theme designed for the block editor makes editing simpler and avoids clumsy workarounds.
Trusted source
Download from the official directory or the developer. Avoid pirated copies, which often contain malware.
A fast home for your theme
LiteSpeed, Redis and free SSL on every plan, from 84p a month (£10.03 billed yearly).
Process
How to pick and test a theme
List what the site needs
Pages, layouts, a blog, a shop, a booking page. Write down the must haves and the nice to haves.
Shortlist three themes
Use the official directory filters or a trusted marketplace, and read recent reviews, not just the average score.
Check speed and mobile
Run each demo through a speed test and open it on your phone.
Read support and update records
A theme last updated two years ago is a risk. A busy, helpful forum is a good sign.
Install on a test site
Use staging or a fresh WordPress install. Add your logo, real text and real images, not just the demo content.
Test the journeys
Check the menu, search, contact form and the pages you use most. Try it with long headings and missing images.
Decide and document
Choose one, note the settings you changed and keep a child theme for any code edits.
Common mistakes
Mistakes that make a theme regretted
The most common mistake is choosing from the demo alone. Demos are carefully built with professional photography, tuned content and often extra plugins. Your site will have your own photos and your own words, and it may look quite different. Always install the theme and test it with real content before committing.
A second mistake is picking a multipurpose theme with every feature imaginable. These can be tempting, but they often load a large amount of code and settings that you never use, which slows pages and makes the admin area confusing. A focused theme, plus a few well chosen plugins, usually produces a faster and easier site.
The third mistake is editing the theme files directly. When the theme updates, your changes are wiped out. Create a child theme for custom code and styles, so updates can be applied safely. If you use a block theme, much of the customisation happens in the site editor, which is stored in the database and survives updates, though you should still keep backups.
Match the theme
Which kind of theme suits which site
| Site type | What to prioritise | Watch out for |
|---|---|---|
| Small business brochure | Clean layout, speed, contact options | Over complicated multipurpose themes |
| Blog or magazine | Readability, archives, typography | Heavy sliders and widgets |
| Online shop | Compatibility with your shop plugin | Shop styling that clashes on updates |
| Portfolio | Image handling and galleries | Large unoptimised images |
| Local service business | Phone buttons, maps, clear calls to action | Poor mobile menus |
| Membership or courses | Plugin compatibility | Theme locking you into one plugin |
Quality
Accessibility, search and legal basics
Good themes take accessibility seriously: sensible colour contrast, keyboard navigation, clear focus states and proper heading structure. These help every visitor and are part of running a professional site. WordPress provides an accessibility-ready tag in the official directory, which gives you a place to start, though you should still test with the keyboard and zoomed text.
For search, a theme should output clean, semantic HTML, with a single main heading on each page, fast loading and a mobile layout that works. It should not hide important text or rely on scripts to show basic content. Themes alone do not make a site rank, but a poor one can hold it back.
UK sites that collect data need a privacy notice and often a cookie notice, depending on what they do. Check the Information Commissioner's Office website for guidance. This is not legal advice, but it is worth choosing a theme that makes it easy to add a footer menu with privacy and terms pages.
Worked example
Choosing a theme for a local trades business
Suppose a plumber in Leeds needs a five page site with a prominent phone number, a short list of services and a contact form. A lightweight block theme with a sticky call button suits far better than a giant multipurpose theme with sliders and portfolio grids. It loads fast on a phone, which is where most emergency searches happen, and it is simple enough to edit without help.
The plumber installs two candidates on a test site, adds real photos and text, and checks each on a phone. One has a cramped menu and the other reads cleanly, so the choice is easy. Spending an hour on this saves months of living with the wrong layout.
Final check
Before you commit to a theme
- Updated in the last year
- Works with the current WordPress and PHP versions
- Passes a mobile speed test
- Looks right with your real content
- Menus and forms are easy to use on a phone
- Support is active and helpful
- Downloaded from a trusted source
- Child theme or editor method chosen for changes
After
Switching theme later
You can change theme at any time, but plan it. Back up first, try the new theme on a staging site and check widgets, menus and any content that used theme specific shortcodes or page builder layouts. Content built with a page builder tied to your old theme may need rebuilding.
If you are starting from scratch, our guide to installing WordPress covers the first steps, and the comparison of WordPress and website builders may help if you are still deciding on the platform itself.
FAQ
Common questions
Can I change my theme later?
Yes. Your content stays in the database, but the layout will change, so back up and test on staging first.
Are free themes any good?
Many are, especially lightweight ones from the official directory. Check update history and reviews.
Does the theme affect speed?
A great deal. Heavy themes load more code. Test the demo on a phone before choosing.
What is a child theme?
A small theme that sits on top of a parent theme, so your custom code survives updates to the parent.
Do I need a page builder?
Not always. The block editor handles most layouts. Add a page builder only if you need more.
Keep reading
Related pages
Launch your theme on fast UK hosting
One-click WordPress on every plan.