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Custom WordPress Plugin and Theme Development

Sometimes the plugin you need does not exist — or the three that come close each bring a settings panel, a licence key and a security surface you did not ask for. We write focused custom plugins and themes that do precisely one job, follow WordPress coding standards, and survive core updates without drama.

What You Get

Included as standard on every engagement — not an upsell list.

A plugin scoped to one job

We define the single problem the plugin solves and build for that, with no upsell screens or unrelated features. Smaller surface area means fewer bugs, faster load, less to review at security-audit time and a much simpler upgrade path.

Admin interfaces your team can use

Settings screens, custom columns, bulk actions, meta boxes and dashboard widgets built with native WordPress UI components. Staff get tools that look and behave like the rest of the admin instead of an alien control panel.

Custom and block theme development

Classic themes, child themes and block themes with theme.json, built from your design system so global styles, fonts and spacing are defined once. Editors get curated block patterns rather than a blank canvas and infinite choices.

Third-party integrations inside WordPress

We wrap external APIs — CRMs, booking systems, payment providers, LLM endpoints — in a plugin with proper authentication, transient caching, retry handling and error logging, so an upstream outage degrades gracefully instead of white-screening your site.

Standards-compliant, reviewable code

WordPress Coding Standards, sanitised inputs, escaped outputs, nonce-protected actions, prepared database statements and translation-ready strings throughout. Your next developer can read it, and a security reviewer can sign it off.

Documentation and update path

Every build ships with a README covering hooks, filters, settings and known limits, plus a changelog. Where useful we add a private update server so your team can roll out new versions across multiple sites cleanly.

How We Deliver It

Stage by stage, with the approval points marked. WordPress Plugin & Theme Development follows the same rhythm on every project.

  1. Functional specification

    We write down exactly what the plugin or theme must do, the user roles involved, the data it stores and the edge cases it must survive. Ambiguity here is what turns a two-week build into a two-month one, so we resolve it in writing first.

  2. Architecture and data design

    We decide where data belongs — post meta, custom tables, options or an external API — and design the hooks and filters other code will use. Getting this right keeps the plugin performant as your record count grows.

  3. Build in a versioned environment

    Development happens in Git with a local and staging environment, coding standards enforced, and incremental demos so you can steer the build rather than react to it at the end.

  4. Testing across roles and scenarios

    We test each user role, permission boundary, failure state and upgrade path, including deactivation and reactivation, and confirm the plugin behaves with your existing theme and plugin stack rather than only in isolation.

  5. Deployment and knowledge transfer

    We deploy to production, verify against real data, and hand over the repository, documentation and a walkthrough for whoever maintains it next — your team, ours, or a developer you hire later.

What You Receive

The concrete artefacts handed over at the end — files, access and documentation you keep.

  • Custom plugin or theme as an installable, versioned package
  • Full source code in a Git repository you own
  • Functional specification signed off before development
  • Admin settings screens and role-based permissions
  • Developer README documenting hooks, filters and options
  • Translation-ready strings with a POT file
  • Changelog and semantic version numbering
  • Upgrade and rollback instructions

Ideal for

If two or three of these sound like your situation, this is the right place to start.

  • No existing plugin does what your workflow actually requires
  • You are paying licence fees for plugins you use ten percent of
  • A third-party plugin is slowing your site or failing security review
  • You need WordPress to talk to an internal system or private API
  • You run several sites that need the same custom functionality
  • You want a design system enforced in the block editor

Tools we use

Standard, portable tooling. The licences, accounts and source stay in your name, so nothing here is a reason you cannot leave.

  • WordPress
  • PHP
  • ACF
  • MySQL
  • JavaScript
  • React
  • WP-CLI
  • Git
  • WordPress REST API
  • Composer
  • WPML

Live projects where this work did the heavy lifting:

Frequently Asked Questions

The questions we get asked most about WordPress Plugin & Theme Development.

Not on day one, and we will say so. A commercial plugin costs less upfront and makes sense when it matches your needs closely. Custom becomes the better economics when you would otherwise stack three plugins to approximate one workflow, when annual licence fees across multiple sites add up, or when a plugin is being used so far outside its intended purpose that it breaks with every update.
It should not, because we build against documented WordPress APIs, hooks and filters rather than patching core files or relying on undocumented internals. That is exactly what the API layer is for. We test against WordPress release candidates for clients on a maintenance plan, and where a deprecation is announced we schedule the change before the release lands.
Yes. You receive the full source in a repository you control, with no licence key, no phone-home call and no obligation to keep working with us afterwards. Plugins built on WordPress inherit GPL obligations for their WordPress-derived parts, which we explain up front rather than leaving in the small print. Practically speaking, you can hand the code to any competent WordPress developer tomorrow.
Usually. We start with a code review covering structure, security, standards compliance and the update path, then give you an honest assessment: maintainable as-is, worth refactoring, or cheaper to rewrite. Where the code is sound we take over maintenance and add features. Where it stores data in ways that will not scale, we tell you before you invest further.
Yes. We build full site editing themes with theme.json driving colours, typography, spacing and layout, plus curated block patterns and template parts for your key page types. This suits teams who want editors composing pages inside the native editor with guard rails. For sites needing complex conditional templates, a classic or hybrid theme is often still the pragmatic choice.

Ready to start on WordPress Plugin & Theme Development?

Send us the brief — or just the problem. You will get a written scope, a timeline and a fixed price, usually within one working day.