Custom WordPress Plugin Development
When WordPress nearly does what your business needs, a plugin is the cheapest way to close the gap. We build bespoke plugins, WooCommerce extensions, Gutenberg blocks and licensed commercial plugins — written to WordPress coding standards, using documented hooks rather than core hacks, and handed over as code you own outright. Serving the UK, USA, Canada, Europe and the UAE.
What Is Custom WordPress Plugin Development?
Quick Answer — What is custom WordPress plugin development?
Custom WordPress plugin development is building a self-contained piece of software that adds behaviour to a WordPress site without modifying WordPress itself. It is the right answer when no existing plugin does what you need, when you are paying for several plugins chained together to approximate one feature, or when your business logic — pricing rules, workflow, an integration with your own systems — is specific enough that no off-the-shelf product will ever fit. SpiderHunts builds plugins that use WordPress’s own hooks and APIs, so they keep working when WordPress, WooCommerce and PHP update.
WordPress Plugin Services We Provide
Most requests fall into one of these. Pick the slice that fits — we deliver each to the same standard, and we will tell you when an existing plugin already does the job for £49.
Bespoke Plugins From Scratch
A plugin built around your business logic: custom post types, admin screens, settings, scheduled jobs and reporting. Self-contained, documented, and removable without leaving debris in your database.
WooCommerce Extensions
Customer-specific pricing, trade accounts, volume breaks, bespoke shipping rules, custom checkout fields, subscription logic and fulfilment integrations — built through WooCommerce’s own hooks so upgrades stay safe.
Gutenberg Blocks
Custom editor blocks with structured fields rather than a blank canvas, so your team publishes on-brand pages they cannot break. Block patterns, variations and full block-theme support included.
API & System Integrations
Connect WordPress to the systems you already run — CRM, ERP, accounting, courier, payment or an internal database — with retries, queueing and visible failure instead of silent data loss.
Extending Existing Plugins
Need a commercial plugin to behave differently? We extend it through its own hooks and filters in a small companion plugin, so the original keeps receiving updates instead of being frozen by your edits.
Commercial & White-Label Plugins
Plugins you sell: licence key validation, seat limits, an update server so customers upgrade from their own dashboard, a customer account area and the support tooling behind it.
Plugin Security Audits
A written review of a plugin you rely on or inherited: capability checks, nonces, input sanitisation, prepared statements, file handling and dependency currency — with severities and fixes.
Multisite & Enterprise
Network-activated plugins with per-site settings, role mapping across a multisite estate, and deployment that works with version control and staging rather than editing files over FTP.
Maintenance & Rescue
Taking over a plugin whose original developer has gone: an audit, a stabilisation pass, then ongoing compatibility with each WordPress, WooCommerce and PHP release.
When a Custom Plugin Is the Right Answer
We talk roughly a third of plugin enquiries out of a build. These are the cases where commissioning one genuinely pays.
Build it when…
Nothing in the directory does it and the workaround is manual. You are chaining three or four plugins to fake one feature. The logic is specific to how you trade. You are paying more in stacked subscriptions than a build would cost. Or you need it to talk to a system only you run.
Do not build it when…
A mature plugin covers 90% of it for a modest annual fee. The requirement is really a theme or content change. It would be used twice a year. Or the honest fix is a better process rather than more software. We will say so, by name, including when it costs us the work.
The plugin-stack tax
Fifteen premium plugins at £40 a month is £7,200 a year — before counting the fragility of a chain where any one update can break the others. That arithmetic is usually the real case for a build, and it is worth doing before you commission one.
Our WordPress Plugin Development Process
Scoping & a Directory Check
We write down what the plugin must do, then check whether something already does it. Scoping is free and the specification is yours whether or not you build with us.
Architecture & Data Design
Where your data lives — post meta, custom tables or an options record — decided before code. Getting this wrong is the single most expensive plugin mistake, because everything downstream depends on it.
Build in Sprints
One- or two-week sprints, each ending with an installable build on a staging site you can click. No progress percentages — a plugin you can activate and try.
Security & Standards Review
Capability checks on every action, nonces on every form, sanitisation on input and escaping on output, prepared statements on every query. Reviewed against the WordPress coding standards before you see it.
Compatibility Testing
Tested against the current and previous major WordPress release, your PHP version, your theme and the plugins you actually run — because conflicts happen between plugins, not in isolation.
Handover & 90-Day Warranty
The repository in your organisation, a README that gets a developer running, notes on the decisions we made, and 90 days in which anything that does not match the specification is fixed free.
What Separates a Plugin That Lasts From One That Breaks
Most of the plugins we are asked to rescue fail for the same handful of reasons. Every one is a decision made at build time.
Hooks, Never Core Edits
Nothing we write touches WordPress or WooCommerce core, and nothing depends on a theme’s internals. A plugin that edits core is frozen at the version it was written against, and you find out the first time you need a security update.
Security By Default
Capability checks on every privileged action, nonces on every form and AJAX call, sanitised input, escaped output and prepared statements. Most WordPress breaches trace to a plugin, and almost always to one of those five being missing.
Performance That Scales
Indexed queries, no unbounded loads on every page, transient caching where it helps, and assets loaded only on the screens that need them. A plugin that adds 400ms to every request is a plugin your visitors pay for.
It Uninstalls Cleanly
Deactivate and nothing breaks; uninstall and it removes its own tables, options and scheduled jobs. You should be able to leave us and leave the plugin without archaeology.
Translation Ready
Every string wrapped for translation with a proper text domain from day one. Retrofitting internationalisation across a finished plugin is tedious work nobody budgets for.
Documented As We Go
A README, notes on the decisions and their alternatives, and an honest list of the rough edges. Written for the developer who inherits it in two years and has never met any of us.
What a Custom WordPress Plugin Costs
Bands rather than quotes. What moves a project within a band is the number of integrations and how much of your data has to be migrated — rarely the feature count.
Single-Purpose Plugin — £1,500–£4,000
One job done well: a custom field set, a shortcode or block, a scheduled export, a small admin screen. Two to four weeks.
Plugin With an Interface — £4,000–£12,000
Admin screens, settings, roles, reporting and one third-party integration. Four to eight weeks. The most common shape of project we take.
WooCommerce Extension — £8,000–£25,000
Anything touching pricing, checkout, fulfilment or subscriptions, where being wrong costs money rather than being untidy. Six to fourteen weeks.
Commercial Plugin — from £20,000
A plugin you sell: licensing, an update server, seat limits, a customer area and the support tooling. The software is roughly half the work. Eight to sixteen weeks.
Plugin Audit — £800–£2,500
A written review of a plugin you rely on: security, performance, standards and maintainability, with severities and recommended fixes. Under a week, and yours whatever you do next.
Maintenance — from £250/month
Compatibility with each WordPress, WooCommerce and PHP release, security patches, monitoring and a small block of change hours. Cancellable monthly.
Custom WordPress Plugin Development — Questions
How much does custom WordPress plugin development cost?
A single-purpose plugin typically costs £1,500–£4,000. One with an admin interface, settings and a third-party integration runs £4,000–£12,000. A WooCommerce extension changing pricing, checkout or fulfilment is £8,000–£25,000. A commercial plugin with licensing starts around £20,000. We quote a fixed price after a free scoping call, with the exclusions written down.
How long does it take to build a WordPress plugin?
Two to four weeks for a focused plugin, four to eight for one with an admin interface and integrations, and eight to sixteen for a commercial plugin with licensing and update delivery. Every sprint ends with an installable build on a staging site you can test yourself.
Do we own the plugin code?
Yes, entirely, from the first commit. The repository sits in your organisation, there is no licence back to us, no obfuscation and no phone-home. WordPress plugins are GPL by nature and we do not pretend otherwise.
Can you fix or extend a plugin somebody else wrote?
Yes, and it is a large part of what we do. We audit it first and tell you honestly whether it is worth keeping — usually it is. Where possible we extend it from a small companion plugin using its own hooks, so the original keeps receiving updates rather than being frozen by your edits.
Will the plugin survive WordPress and WooCommerce updates?
That is a design decision rather than luck. We use documented hooks and APIs, never edit core, never write directly to core tables, and test against the current and previous major versions. Built that way a plugin survives updates; built with core hacks it does not, which is why most rescue jobs we see are exactly that.
Can you build a plugin we sell to our own customers?
Yes. That means licence key validation, an update server so customers upgrade from their own dashboard, seat limits, a customer-facing account area and a support process. The software is roughly half of it — the rest is onboarding, billing and support, and we will be straight with you about that before you commit.
Should we build a plugin or just use an existing one?
Use an existing one whenever a mature plugin covers most of it — we recommend that in roughly a third of first conversations, by name and with no affiliate arrangement. Build when your logic is genuinely specific to how you trade, or when the stack of subscriptions faking the feature already costs more than a build.
Do you submit plugins to the WordPress.org directory?
We can, and we will tell you whether it is worth it. The directory brings reach and also a support obligation, a review process and a GPL-only distribution model. For most business plugins the answer is to keep it private; for a product, listing a free tier alongside a paid one is often the right shape.
Need a WordPress Plugin Built Properly?
Tell us what WordPress nearly does. We will tell you whether an existing plugin already covers it, and if not, what a bespoke one would cost — as a fixed price, with the exclusions written down.