When an off-the-shelf theme can't do what your business needs, we build WordPress around you: bespoke themes, custom blocks, plugins and integrations that load fast, stay secure and are easy for your team to edit.

  • London-headquartered since 2019
  • No page-builder bloat
  • You own all code and content
Custom WordPress website development by Fulminous Software

WordPress built around your business, not a template

Most WordPress sites start with a pre-made theme and a stack of plugins. That works for simple sites, but it often leads to slow pages, design compromises, plugin conflicts and an admin area your team struggles to use.

Custom WordPress development takes a different approach. We design your site first, then build a lightweight theme and custom blocks that match it exactly, adding only the functionality you need. You get the flexibility of WordPress with the performance and polish of a bespoke build.

Need a standard WordPress website rather than a fully custom build? See our WordPress web development services.

Our custom WordPress development services

Everything needed to plan, build, extend and look after a custom WordPress website.

01

Custom theme development

Lightweight, hand-coded themes built from your designs, with no unused features slowing your site down.

02

Custom Gutenberg blocks

Reusable blocks for the WordPress block editor, so your team can build new pages without breaking the design.

03

Custom plugin development

Bespoke plugins for features like booking, calculators, member areas and custom workflows, built to WordPress coding standards.

04

WooCommerce customisation

Custom product types, checkout flows, pricing rules and integrations for online stores.

eCommerce development

05

API and system integrations

Connecting WordPress to CRMs, payment gateways, booking tools, ERPs and marketing platforms.

06

Headless WordPress

WordPress as a content back end with a fast React or Next.js front end, for sites that need app-like speed.

Headless CMS explained

07

Migration to WordPress

Moving from another CMS or an old WordPress build, with content, URLs and SEO carried over safely.

08

Speed and security hardening

Core Web Vitals improvements, caching, image optimisation, secure configuration and update management.

09

Maintenance and support

Core, theme and plugin updates, backups, monitoring and new features after launch.

Custom WordPress vs a pre-made theme

A pre-made theme is quicker to launch. A custom build pays off when your site needs to perform, scale and stand out.

Pre-made theme and page builderCustom WordPress development
DesignLimited to the theme's layoutsBuilt exactly to your brand and designs
SpeedOften slowed by unused code and builder scriptsLightweight code focused on Core Web Vitals
EditingFlexible, but easy to break layoutsCustom blocks with guard rails for your team
FunctionalityDepends on third-party pluginsCustom features built for your workflow
Security and updatesMore plugins means more risk and conflictsFewer dependencies, easier to maintain
Best forSimple sites on a tight timelineGrowing businesses, complex sites and integrations

Our custom WordPress development process

A clear, staged process with your approval at each key point.

  1. Discovery

    We learn your goals, audience, content and the systems WordPress needs to work with.

  2. Planning

    Sitemap, features, integrations and a project plan with clear milestones.

  3. UX and UI design

    Wireframes and visual designs for key pages, refined with your feedback.

  4. Development

    Custom theme, blocks and plugins built on a staging site you can review.

  5. Testing

    Browser, device, speed, accessibility, form and integration testing.

  6. Launch

    Go-live with redirects, SEO checks, analytics and backups in place.

  7. Support

    Updates, security monitoring and improvements after launch.

Technology we use

Modern WordPress tools chosen for performance, maintainability and easy editing.

WordPress core

PHP, the block editor (Gutenberg), custom post types and Advanced Custom Fields.

eCommerce

WooCommerce with custom extensions, payment gateways and shipping rules.

Front end

Semantic HTML, modern CSS and JavaScript, with React for custom blocks and headless builds.

APIs

WordPress REST API and WPGraphQL for integrations and headless front ends.

Design

Figma for wireframes, prototypes and design systems.

Hosting and workflow

Managed WordPress hosting or cloud platforms such as AWS, with Git, staging sites and automated backups.

Industries we build WordPress websites for

Each sector has its own content, compliance and integration needs. We build with them in mind, including UK GDPR for sites that handle personal data.

  • Finance and professional services
  • Healthcare
  • eCommerce and retail
  • Real estate
  • Education
  • Charities and non-profits
  • Media and publishing
  • Corporate

Planning your WordPress budget?

The cost of a custom WordPress website depends on your design, features and integrations. Our guide to WordPress website costs in the UK explains typical ranges, or ask us for a fixed quote.

Get a fixed quote

Flexible ways to work with us

Choose the model that suits your scope, timeline and how involved you want to be.

Fixed price

For projects with a clear scope and deliverables.

  • Agreed cost and milestones
  • Ideal for new websites and rebuilds

Time and materials

For evolving requirements or complex functionality.

  • Flexible scope with transparent billing
  • Ideal for larger or phased projects

Dedicated team

For ongoing development and support.

  • Experienced WordPress developers on your roadmap
  • Scale up or down as needed

Need developers to work alongside your own team? You can hire dedicated developers.

Custom WordPress development FAQs

What is custom WordPress development?

Custom WordPress development means building your website's theme, blocks and features specifically for your business, instead of adapting a pre-made theme. It gives you full control over design, speed and functionality while keeping WordPress's easy content editing.

How much does custom WordPress development cost?

The cost depends on the number of page templates, custom features, integrations and whether you need WooCommerce. We provide a fixed quote after understanding your requirements. For typical UK price ranges, see our WordPress website cost guide.

Will my team be able to update the website?

Yes. We build custom blocks and editing options around your content, so your team can add pages, update text and images, and publish posts without needing a developer or risking the design.

Can you migrate my existing website to WordPress?

Yes. We migrate content, media and users from other platforms or older WordPress builds, keep existing URLs where possible, set up 301 redirects where they change, and carry over SEO metadata to protect your rankings.

How do you keep WordPress websites secure?

We keep plugins to a minimum, follow WordPress coding standards, use SSL, secure logins and limited user roles, and set up backups and monitoring. With a support plan, we also handle core, theme and plugin updates.

Should I choose WordPress or a fully bespoke website?

WordPress suits most content-led and marketing websites, especially when your team needs to edit content often. A fully bespoke platform can be better for complex web applications. Our WordPress vs bespoke guide explains the trade-offs.

Do you provide support after launch?

Yes. We offer ongoing maintenance and support, including updates, backups, security monitoring, speed improvements and new features as your business grows.

Ready to build a WordPress website that fits your business?

Tell us what you need. We'll recommend the right approach and send you a clear, fixed quote.

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