<WordPress Plugin Development/>

Custom functionality your client cannot buy off the shelf, built under your agency's name.

Every agency eventually hits the request that no plugin in the repository handles properly. A booking system that follows the client's real rules, a sync with the software their operations team already runs, a calculator that produces a quote, an admin screen that removes a manual job. mb3techs builds that functionality as a proper WordPress plugin: hooks and APIs rather than edits to core, security handled as standard, and full source ownership transferred to you. Your client sees a solution from your agency. They never see us.

// what's included

What we build

Custom Feature Plugins

Functionality built to the client's actual process rather than bent to fit an existing plugin. Bookings, calculators, portals, workflows, approvals and internal tools.

API & Third-Party Integrations

Two-way syncs with CRMs, ERPs, payment providers, shipping and booking systems, built against real APIs with proper error handling, retries and logging.

Custom Post Types & Data Models

Content architecture that makes sense years later: post types, taxonomies, relationships, custom tables where volume demands them, and admin screens the client's team can use.

WooCommerce Extensions

Payment gateways, shipping methods, pricing rules, order workflow changes and checkout logic, written as extensions so WooCommerce updates do not undo them.

Gutenberg Blocks

Custom blocks and block patterns with real editor controls, so the marketing team can build pages without breaking layouts or calling you for every change.

Plugin Audits & Rescue Work

Inherited or abandoned code reviewed, documented, made secure and brought up to current standards, or replaced when patching it has stopped making financial sense.

Maintenance & Compatibility

Ongoing updates as WordPress, PHP and WooCommerce move, so custom code written this year still runs cleanly in two years.

Security Hardening

Sanitisation, escaping, capability checks, nonces and prepared statements applied throughout, plus a review of anything the plugin exposes publicly.

// how it works

How a plugin project runs

01

You Send the Requirement

Describe what the client needs to happen, not how to build it. If you have a spec, better. If you have a messy email from the client, that works too and we will turn it into a spec.

02

We Scope & Confirm Same Day

Your Project Manager confirms the approach, tells you whether an existing plugin already solves it, and gives you a fixed quote and timeline the same day.

03

We Write the Specification

Before code, you get a short written spec: what it does, what it does not do, where it hooks in, and what happens in the edge cases. This is what stops change requests later.

04

We Build & Test

Development against current WordPress and PHP versions, tested with the client's actual theme and plugin stack rather than a clean install, because that is where conflicts show up.

05

You Receive the Source

Documented, commented source with installation notes and a version history. Ownership transfers to you. Nothing calls home, nothing expires.

// standards

What ships with every plugin

  • Written specification agreed before development starts
  • WordPress coding standards, with hooks and filters rather than core edits
  • Input sanitised and output escaped throughout, with capability checks on every action
  • Tested against the client's real theme and plugin stack, not a clean install
  • Translation ready, with text domains set up correctly
  • Uninstall handled properly so removal does not leave orphaned data
  • Commented source and documentation, with full ownership transferred to you
  • 30 days of post-launch bug fixes included on every build

// guarantee

The white label guarantee

  • NDA signed before any work begins
  • No mb3techs branding in code, admin screens or documentation
  • Full source ownership transferred to you, with no licence tied to us
  • No direct contact with your clients, ever
  • Client data and business logic stay confidential
  • Code another developer can pick up and understand
Start a project

// faq

WordPress plugin development: questions agencies ask

Yes. The full source is yours on delivery, with no licence key, no phone-home, and no dependency on us to keep it running. You can resell it, rebrand it, or hand it to another developer later.
Often yes, and it is usually the more economical route. Many requirements are met with a child plugin that hooks into what is already installed. We review what the client already has before quoting a from-scratch build, so you get the most value for the budget.
We audit it first and give you a clear picture, including the parts that are working well. Inherited code is completely normal. You get a straightforward recommendation on whether to extend what is there or rebuild the piece, before any work starts.
That is the point of building it properly. We use documented hooks and APIs, avoid patching core or third-party files, and test against current WordPress, PHP and WooCommerce versions. We also tell you which versions it was tested on, so you have something to give the client.
Yes. Public release work is different from client work: it needs stricter coding standards, sanitisation and escaping throughout, translation readiness, an update mechanism and a readme that passes review. We build to those requirements when the plugin is going public.
Regularly. CRM syncs, payment and booking systems, ERP connections, custom endpoints for a headless front end, and scheduled jobs that reconcile data. Integrations get error handling and logging so a silent failure does not turn into a client call weeks later.
Input sanitised, output escaped, capability checks on every action, nonces on forms and AJAX, prepared statements for queries. Plugins are the most common way a WordPress site gets compromised, so this is not treated as optional polish.
Fixed quote per plugin once the specification is agreed, or from reserved hours on a dedicated developer plan. Small utility plugins are quick. Anything touching payments, subscriptions or external data usually needs a short discovery step first, and we will tell you if that applies before you quote the client.

// next step

Tell us what the plugin needs to do

Send the requirement in plain language and you will get a fixed quote and a written approach back, usually within one business day. If an existing plugin already does the job, we will tell you that instead of selling you a build.

Get a fixed quote