Custom plugin development

Bespoke WordPress plugins, engineered to last.

When an off-the-shelf plugin doesn’t fit — or when twelve of them are fighting each other — we build one that does exactly what you need. REST APIs, WooCommerce extensions, Gutenberg blocks, CRM bridges, bespoke admin tools. Clean code you own, with tests, docs and a changelog.

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How we work

yoursite.com/wp-admin/admin.php?page=sky-donate

Sky Donate

Dashboard

Campaigns

Donations

Gift Aid

Payment gateways

Webhooks

Settings

Integrations

Logs

Plugin · v3.4.2

Campaign performance

Raised

48,291

Donors

1,284

Gift Aid

9,213

Winter appeal

72%

POST /wp-json/sky-donate/v1/donation

→ 201 Created · 89ms

Custom plugins shipped & maintained

0 +

Building for the WordPress API, since 2013

0 Yrs

Pass WP Coding Standards on release

0 %

On the official wordpress.org directory

What we build

Six kinds of plugin we ship most often.

Your job probably sits near one of these. If it doesn’t, ask — we’ve built stranger.

Payment & donation

Stripe, GoCardless, Apple/Google Pay, PayPal. Subscriptions, Gift Aid, receipts, webhooks. PCI-conscious by default.

Stripe Elements + SCA
HMRC Gift Aid submissions
Idempotent webhook handlers

WooCommerce extensions

Bespoke shipping methods, product configurators, B2B rules, subscription logic. HPOS-ready, HPOS-tested.

Custom payment gateways
Shipping / tax calculators
Role-based quotes & rules

REST / GraphQL APIs

Expose WordPress data properly. Rate-limited endpoints, JWT or OAuth auth, strict schemas, full OpenAPI docs.

Authentication (JWT / OAuth 2)
Rate limiting & throttling
OpenAPI 3.1 docs

Gutenberg blocks

Custom blocks with the real block editor: Inspector controls, InnerBlocks, block patterns. Not a re-skinned shortcode.

block.json registration
Dynamic + server-rendered blocks
Matching editor / frontend CSS

CRM / ERP bridges

Two-way sync to Salesforce, HubSpot, Zoho, Dynamics, Xero, Sage. Queue-backed, retry-safe, auditable.

Bi-directional sync jobs
Action Scheduler queues
Field-mapping admin UI

Admin & workflow tools

Internal dashboards, bulk editors, reporting, import/export. Things your ops team asks for, built once, properly.

Custom admin screens
Bulk & CSV pipelines
Role & capability control

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Three shapes of plugin engagement.

Starting points: your exact brief shapes the final quote. Everything comes with a git repo, tests and documentation, regardless of size.

Plugin project options

Scoped builds and support options. Every plugin ships with PHPUnit tests and a README.

Quoted after scope

Targeted

Single-purpose plugin

One job, done well. A Gutenberg block set, a single-gateway integration, a shortcode-driven widget.

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Delivered in 2–3 weeks

Get a quote

Scope	Single feature
Admin UI	Settings page
REST endpoints	Up to 2
Custom blocks	Up to 3
Integrations	1 third-party
Tests	PHPUnit smoke
Documentation	README + PHPDoc
Warranty	30-day bug fix

Platform

Multi-feature plugin

A proper admin area, several features, a REST API, a reporting dashboard. The size most client work lands at.

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Delivered in 5–8 weeks

Get a quote

Scope	5–10 features
Admin UI	Full React admin
REST endpoints	Up to 10
Custom blocks	Up to 8
Integrations	Up to 3 third-party
Tests	PHPUnit + Playwright
Documentation	README + user guide
Warranty	60-day + 3-mo priority

Distributable plugin

SaaS-style plugin for your own customers. Licensing, auto-updates, multi-tenant, wordpress.org submission support.

Get a quote

Delivered in 10–16 weeks

Get a quote

Scope	Productised
Licensing	EDD / Freemius / custom
Auto-update server	Included
REST endpoints	Unlimited
Multi-site / multi-tenant	Yes
Tests & CI	PHPUnit + GH Actions
wordpress.org submission	Supported
Warranty & retainer	90-day + ongoing

Technology

The engineering stack behind every plugin.

Built around the WordPress API, tested like production software, and integrated with the systems your business already uses.

WordPress-native logic.

Custom post types, admin screens, REST endpoints, cron jobs, permissions and settings built with the WordPress APIs instead of fragile theme hacks.

Admin interfaces people can use.

Clean wp-admin workflows with React where it helps, native list tables where they are faster, and clear states for staff who live in the dashboard.

Commerce and CRM ready.

Payment, Gift Aid, quote, booking and CRM integrations are scoped as first-class workflows, not added as risky afterthoughts at launch.

Testing and quality

Quality gates before the plugin touches a live site.

Every serious plugin needs more than a happy-path demo. We check data, security, browser behaviour and future WordPress updates before handover.

PHPUnit

Core logic and edge-case coverage.

PHPCS / PHPStan

Standards, types and maintainability.

Playwright

Browser checks for critical admin flows.

GitHub Actions

Repeatable checks on every change.

Security review

Nonces, capability checks and sanitisation.

Upgrade path

Migrations, uninstall and versioned releases.

Integrations we build against

Stripe

GoCardless

HMRC Gift Aid

Salesforce

HubSpot

Accounting

Process

From spec to shipped, in five stages.

Every plugin comes with a proper technical specification before a line of code is written. You approve the spec: we stick to it.

Discovery

What problem, what users, what integrations. We’ll tell you if an existing plugin already solves this saving you the build.

Week 1

Technical spec

Data model, REST endpoints, admin UI wireframes, security model. You sign off. Fixed cost from here.

Weeks 1–2

Build & test

Two-week sprints with a staging build and demo every Friday. PHPUnit + Playwright running on every PR.

Weeks 2–7

UAT & hardening

You (and your users) hammer it on staging. Security review, WP Coding Standards pass, compatibility sweep.

Weeks 6–8

Release & support

Versioned release, changelog, docs, Loom walkthrough. Optional retainer for updates and WP-core compatibility.

Week 8+

Questions

Plugin questions, answered.

What kinds of plugins do you build?

Everything from a single Gutenberg block or payment gateway to full SaaS-style products with licensing and auto-updates — WooCommerce extensions, REST and GraphQL APIs, CRM and ERP bridges, and internal admin tools.

Will I own the plugin and its source code?

Yes. Every custom plugin ships with the full Git repository, README, CHANGELOG and developer docs. There is no lock-in, so any competent WordPress developer can maintain it.

Do you follow WordPress coding standards?

Yes. We build to PSR-12 with strict types, pass the WordPress Coding Standards (PHPCS) and PHPStan, and test with PHPUnit and Playwright before handover.

Can you extend or fix an existing plugin?

Yes. We audit the existing code first, then extend, refactor or repair it — or recommend a rebuild if the code cannot be maintained safely.

Is the plugin compatible with WooCommerce HPOS and multisite?

Yes. We build and test against WooCommerce HPOS, WordPress multisite and PHP 8.2+, and keep pace with each WooCommerce and WordPress release.

Can the plugin integrate with our CRM, payments or other systems?

Yes. We build queue-backed, retry-safe integrations with Stripe, GoCardless, HMRC Gift Aid, Salesforce, HubSpot, Zoho, Xero and custom REST or GraphQL APIs.

Do you publish plugins to the WordPress.org directory?

Yes. For distributable products we handle wordpress.org submission, along with licensing, an auto-update server and multi-tenant support.

How long does a custom plugin take?

A single-purpose plugin takes 2-3 weeks, a multi-feature plugin 5-8 weeks, and a distributable product 10-16 weeks. You get a fixed timeline at spec sign-off.

How much does a custom plugin cost?

Every plugin is quoted to scope once the technical spec is agreed. Pricing depends on the features, integrations, testing and whether it is for one site or for distribution.

Do you provide support and updates after launch?

Yes. Every plugin includes a post-launch bug warranty, and most clients move to a retainer for updates, new features and WordPress-core compatibility.