Custom WordPress Plugin Development

Bespoke WordPress Plugins Built to Your Exact Specification — Fixed Price, You Own the Code

When no available plugin does what your business needs without compromises, we build it. Written specification, fixed price, WordPress coding standards, you own the custom code we write for you. We have built SEO plugins, booking systems, CRM tools, event management, invoicing, and chat systems — all deployed on live client sites.

24/7

Customer Support

200+

Websites Built

2020

Established In Cumbria

Plugin Development being shown on screen

Built Because Off-the-Shelf Solutions Required Compromises

Every plugin in our portfolio started as a client requirement that no available plugin could meet correctly. The Technophobia SEO plugin because no available SEO plugin handled all schema types without conflicts. The Holiday Home Booking plugin because no booking plugin handled Cumbrian holiday let pricing complexity. The Learner Management System because no LMS handled funded training eligibility requirements.

We build plugins when the compromise of using a generic solution would produce a worse outcome than a purpose-built one. That means we scope carefully before recommending a custom build — if an available plugin genuinely fits your requirements, we tell you. If it does not, we build the solution that does.

Our WordPress development services cover everything from custom theme builds to complex REST API integrations — all delivered by Technophobia Ltd, the software arm of the Whamos group.

Plugin development is one part of what we do — see our Web Design Cumbria hub for the broader service list.

Types of Custom Plugins We Build

Six categories of custom plugin development — all deployed on live client sites across Cumbria and the North West.

Booking System Plugins

Custom booking plugins for holiday lets, activity providers, accommodation, motorhome sites, and appointment-based service businesses. Availability calendars, payment schedules, iCal sync, customer portals, and owner dashboards — built around your specific pricing rules and business logic.

SEO and Schema Plugins

Custom SEO plugins handling schema markup, meta tags, sitemaps, social links, and structured data — built when generic plugins produce incorrect schema, cause conflicts, or cannot handle your specific content types correctly. Our Technophobia SEO plugin is the benchmark example.

CRM and Data Plugins

Lightweight CRM functionality built into WordPress — contact management, communication history, task management, and pipeline tracking. Custom data management plugins for businesses whose data structure does not fit standard WordPress post types or generic CRM platforms.

Communication Plugins

Chat widgets with SMS operator notifications, email automation integrations, webhook receivers for n8n workflow automation, and notification systems. The TP Chat Bot plugin is the live example — visitor chat with Twilio SMS responses, no desktop monitoring required.

Management System Plugins

Event management, invoice management, learner management — complex management systems built as WordPress plugins when SaaS alternatives are too expensive, too generic, or create unacceptable data privacy issues by processing your data on third-party servers.

Integration Plugins

REST API integrations connecting your WordPress site to third-party services — Stripe, PayPal, Twilio, n8n, DocuSeal, What3Words, iCal feeds, and custom webhook receivers. Properly built integrations with error handling and monitoring, not fragile point-to-point connections.

How We Build Custom Plugins — Specification, Standards, Ownership

South Cumbria Skills Exchange learner management system grants module showing grant eligibility and funding records

Every custom plugin project starts with a discovery conversation where we understand your requirements in detail. Then we produce a written specification covering every feature, every data structure, every integration, and every user interaction. The specification is the contract — the price is fixed against it before development begins.

WordPress coding standards throughout. Correct use of hooks, filters, and the Settings API. No direct database queries bypassing the WordPress abstraction layer. No shortcut code that breaks on WordPress updates. Code that any competent WordPress developer can read, understand, and maintain without us — because creating dependency on our continued involvement is not in your interests.

Your custom-built work is yours on delivery. The plugin code, the database tables, the documentation, and the right to modify and distribute the plugin. No additional charges for the original custom work. Any third-party plugin licences are outlined separately. If you want another developer to extend it in five years, you have everything they need.

We test thoroughly before delivery. Unit testing, integration testing, and real-world testing on a staging environment before anything goes to production. We do not consider a plugin finished until it works correctly under real conditions — not just in our development environment.

Documentation is part of the delivery. Not an afterthought — every custom plugin comes with developer documentation covering the code architecture, database structure, hook and filter reference, and any required configuration. Written so that any developer can work with it, not just the one who built it.

Why Choose Whamos for Custom Plugin Development

Deployed on Live Sites

Every plugin type we offer has been built and deployed on live production sites. We know where the edge cases are because we have hit them. Production-proven, not theoretical.

WordPress Coding Standards

Correct hooks, filters, Settings API usage throughout. No code that breaks on updates. Any competent WordPress developer can read and maintain it without needing us.

Fixed Price, Full Specification

Written specification before we start. Fixed price against it. No day rates, no scope creep. If the specification changes, we quote the change separately before implementing.

You Own the Code

The code, the documentation, and the right to modify it — all yours on delivery. Licence terms clearly outlined. Another developer can extend it without us. This is how software development should work.

Custom Plugin Development — Frequently Asked Questions

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Need a Custom WordPress Plugin?

Written specification. Fixed price. WordPress standards. You own the code.