Custom Plugin Development
Bespoke plugins for unique functionality. Admin interfaces, custom post types, REST API endpoints, Gutenberg blocks—whatever you need.
Custom Development
WordPress Plugin & Custom Development
Need functionality that doesn't exist off-the-shelf? We build custom WordPress plugins, advanced WooCommerce solutions, and bespoke integrations that extend WordPress beyond its limits.
When off-the-shelf plugins aren't enough
Sometimes your business needs functionality that simply doesn't exist. Or existing plugins are bloated, slow, or don't quite fit your workflow.
That's where custom development comes in. We build WordPress plugins and solutions tailored to your exact requirements—lean, fast, and purpose-built for your needs.
Whether you need a custom plugin for internal use, want to extend WooCommerce with unique features, or require complex integrations with external systems, we've got the expertise to deliver.
Clean, Maintainable Code
WordPress coding standards, proper hooks, and documentation. Code that any developer can work with.
Performance First
Lean code without bloat. Your custom solution won't slow down your site like premium plugin bundles.
Security Built-In
Proper sanitisation, nonces, capability checks. Security isn't an afterthought—it's foundational.
50+
Custom plugins delivered
Services
What we build
Custom WordPress development for complex requirements:
WooCommerce Extensions
Custom product types, checkout modifications, subscription logic, B2B pricing, multi-vendor features, and advanced shipping rules.
API & Integrations
Connect WordPress to CRMs, ERPs, payment gateways, booking systems, or any service with an API. Two-way sync and webhooks.
Headless WordPress
Use WordPress as a backend CMS with React, Vue, or Next.js frontends. GraphQL or REST API configuration.
Multisite Solutions
WordPress multisite for franchise networks, agency white-labelling, or multi-brand deployments. Shared functionality, separate content.
Workflow Automation
Custom admin workflows, automated content publishing, scheduled tasks, and business logic automation within WordPress.
Case Study
Custom WooCommerce B2B plugin for industrial supplier
A leading industrial supplier needed B2B functionality that no existing plugin could provide: customer-specific pricing tiers, quote requests, credit account management, and integration with their Sage accounting system.
We built a comprehensive B2B plugin that handles tiered pricing based on customer groups, quote-to-order conversion workflows, credit limit management, and real-time sync with Sage for invoicing and stock levels. The admin interface gives their sales team full visibility into customer accounts.
£2M+
Annual B2B orders processed
80%
Reduction in manual order entry
Real-time
Sage integration
"The B2B plugin has transformed our online trade business. Customers can see their specific pricing, place orders on account, and everything syncs straight to Sage. It's exactly what we needed and no off-the-shelf solution came close."
— Operations Director, Industrial Supplier
Deliverables
What you get
Full Source Code
Complete ownership of all custom code. Delivered via Git with full version history.
Technical Documentation
Code documentation, hook references, and developer guides. Future developers can extend your plugin.
User Documentation
Admin guides and user manuals for your team. Video walkthroughs where helpful.
Testing & QA
Tested across WordPress versions, PHP versions, and common plugin conflicts. Ready for production.
Update Compatibility
Built to survive WordPress updates. Proper use of hooks and APIs means no breakage.
30-Day Support
Bug fixes and adjustments included post-launch. Extended support available.
Technology
Built with modern WordPress standards
WordPress Stack
WordPress
WooCommerce
PHP 8+
MySQL
Frontend
JavaScript
React (Gutenberg)
Vue.js
REST API
Tools
Git
Composer
PHPUnit
WP-CLI
Why Choose Us
The right partner for custom WordPress?
vs Premium Plugin Bundles
- Only the features you need—no bloat
- No annual licence fees
- Fits your workflow exactly
- Better performance
vs Freelance Marketplaces
- UK-based, accountable, not disappearing
- Proper WordPress coding standards
- Long-term support available
- Direct communication, no middlemen
vs DIY / In-House
- 19+ years WordPress expertise
- Know the pitfalls and best practices
- Faster delivery, proven processes
- Free up your team for core business
Investment
What to expect
Simple Plugins
£1,500 – £5,000
Single-purpose plugins, admin tools, basic integrations. 2-4 weeks.
- Custom post types & taxonomies
- Simple API integrations
- Admin dashboard widgets
- Custom Gutenberg blocks
Most Common
Business Plugins
£5,000 – £15,000
Multi-feature plugins, WooCommerce extensions, complex integrations. 4-8 weeks.
- WooCommerce customisations
- Complex business logic
- Multi-system integrations
- Custom admin interfaces
Enterprise Solutions
£15,000+
Large-scale custom solutions, multisite, headless setups. 8+ weeks.
- Complete custom platforms
- Multisite networks
- Headless WordPress
- Enterprise integrations
Need a WordPress website instead? Standard WordPress website design is handled by our design team at simontodd.design. This service is specifically for custom development, plugins, and bespoke solutions.
FAQs
Common questions
Can you modify an existing plugin instead of building from scratch?
Sometimes, but we generally advise against it. Modifying third-party plugins means your changes break with every update. Usually it's better to build complementary functionality that hooks into the existing plugin, or build a custom solution that replaces it entirely.
Will my custom plugin work with future WordPress updates?
Yes. We use official WordPress APIs, hooks, and coding standards specifically so your plugin survives updates. We avoid deprecated functions and unofficial workarounds that break. That said, we recommend a maintenance agreement for ongoing compatibility checks.
Can you help us sell a plugin commercially?
Absolutely. We can build plugins to commercial distribution standards, including licensing systems, update mechanisms, documentation, and wp.org submission if appropriate. We've helped clients launch successful commercial plugins.
Do you work with Gutenberg / Block Editor?
Yes. We build custom Gutenberg blocks using React, both standalone and as part of larger plugins. We can also create block patterns, block templates, and full site editing (FSE) components.
What about WordPress.com vs WordPress.org?
Custom plugins require self-hosted WordPress (WordPress.org). WordPress.com doesn't allow custom plugins unless you're on their expensive Business plan or higher. If you're on WordPress.com, we can advise on migration.
Do you offer ongoing maintenance?
Yes. Plugin maintenance packages start at £75/month and cover compatibility updates, bug fixes, and minor enhancements. For active development work, we offer retainer arrangements with dedicated hours each month.
Need custom WordPress functionality?
Tell us what you're trying to achieve. We'll let you know if custom development is the right approach, or if there's an existing solution that fits.