<WordPress Theme Development/>

Custom themes built from your designs, clean enough that the next developer thanks you.

A theme is where a WordPress project is either set up well or quietly sabotaged. Get it right and the client edits their own content for years without a support ticket. Get it wrong and every future change costs your agency time you cannot bill. mb3techs builds custom themes, child themes and block themes for agencies as an invisible development team. You handle the client and the design, we handle the build, the editor experience and the parts nobody enjoys, like making sure a long headline does not wreck the layout on a tablet. NDA first, no branding anywhere in what we hand over.

// what's included

What we build

Custom Themes From Scratch

Built to your designs with no parent theme and no bloat. Only the code the project needs, structured so a developer can read it in a year without a guide.

Block Themes & FSE

theme.json configuration, block patterns, custom block styles and template parts, so the client edits inside the same interface they already use for content.

Child Themes

Clean extensions of commercial or existing parents. Overrides done properly through hooks and template files, never edits to the parent that vanish on update.

ACF & Custom Fields

Flexible content layouts and field groups with labels a non-technical client understands, so page building stays inside the rules the design set.

Responsive Build Out

Every breakpoint checked on real devices, including the states designs never cover: long titles, missing images, empty sections and eight-item menus.

Custom Post Types

Properly registered post types, taxonomies and archive templates for clients whose content is not just pages and posts.

Performance Built In

Assets loaded only where needed, images sized and lazy loaded, no framework pulled in for one component. Speed handled during the build, not bolted on later.

Editor Experience

Sensible admin, clear field names, and a short walkthrough so the client's team can run the site without calling your account manager every week.

// how it works

How a theme build runs

01

You Send Designs & Requirements

Figma, XD or PSD files plus notes on what the client needs to edit themselves. If something is unclear we ask before building, not after.

02

We Scope & Confirm Same Day

Your Project Manager counts the unique templates, flags anything complex, and comes back with a fixed quote and a real timeline on the same day.

03

We Build on Staging

The theme goes up on staging where you can watch it take shape. Templates first, then fields and editor setup, so you see structure early rather than at the end.

04

We Test Properly

Cross browser, real devices, long content, empty content, accessibility checks and a fresh look at speed before we say it is finished.

05

You Launch & Own It

Full source handed over, documented, with a walkthrough if you want one. Your name on the work, your invoice to the client.

// standards

What ships with every theme

  • Written to WordPress coding standards, with escaping and sanitisation throughout
  • No edits to core or to parent theme files, so updates stay safe
  • Translation ready, with text domains set up correctly
  • Semantic heading structure and accessible markup as standard
  • Tested against current WordPress and PHP versions, with those versions documented
  • Editor fields labelled for a client, not for a developer
  • Assets enqueued properly and loaded only where they are used
  • Full source code handed to you, with no licence keys and no dependency on us

// guarantee

Working with us

  • NDA signed before any work starts
  • No mb3techs branding in the theme, admin, code comments or documentation
  • We never contact your client, at any point
  • Scope confirmed the same day you send the brief
  • 30 days of bug fixes after launch, included
Start a project

// faq

Theme development questions

Both, and we will tell you which one the project actually needs. A child theme is the right answer when the client is happy with a commercial parent and wants changes on top. A custom theme is worth it when the design is original, the site is large, or the client is paying for something they own outright rather than renting.
That is the main thing we build for. Sections become blocks or ACF fields with clear labels and sensible limits, so the client can change text, swap images and reorder sections without being able to knock the layout apart. Editors who fear their own website stop calling you for small changes.
Yes, including theme.json setups, block patterns, block styles and template parts. We also still build classic PHP themes, because plenty of agency projects and existing client sites are not ready to move. Tell us the client's situation and we will recommend one rather than pushing whichever is newer.
Often, yes. Themes usually go bad through years of small edits, plugin patches and code pasted into functions.php. We audit what is there, tell you what can be salvaged, and give you a straight comparison between cleaning it up and rebuilding, including which one costs your client less over two years.
Yes. Template hierarchy respected, hooks and filters instead of core edits, escaping and sanitisation throughout, translation ready, and enqueued assets rather than hard coded tags. It matters because the next developer who touches it should not need to phone you to understand it.
Custom themes we build have no upstream update to break. For child themes we test against parent updates and document which version it was built against. If you want ongoing cover, that runs through a retainer rather than being quietly assumed.
Yes. Underscores, Sage, GeneratePress, Blocksy, or your own in-house starter. Working in your stack means your team can maintain the result without learning our habits, which is usually the point of hiring a white label team in the first place.
Fixed quote per theme once we have seen the designs, or from reserved hours on a dedicated developer plan. The number of unique templates drives the price far more than the number of pages, so a twenty page site with four templates is cheaper than a six page site where every page is different.

// next step

Send us the designs and we will tell you what it takes

Share the files and the client's requirements. You get a fixed quote, an honest timeline and a note on anything in the design that will cause trouble later, before you commit to your client.

Get a fixed quote