Shopify Theme Customization for Your Existing Store

Get a Customization Quote
See Our Shopify Work

/

&

Shopify custom development services
custom Shopify development agency
Shopify Plus custom development experts

SPLIT Development customizes the Shopify theme you already have: new sections and templates, layout and mobile fixes, product page features and checkout changes. Your store keeps its design, content and SEO, and you get the changes without paying for a rebuild.

150+

Projects delivered

7+

Years experience

custom Shopify development company

Shopify Theme Customization Services

/01

Sections and templates

  • New Liquid sections and blocks your team can edit in the theme editor
  • Custom templates for product, collection, landing and blog pages
  • Online Store 2.0 upgrades for older themes that don’t support sections on every page

/02

Product and collection pages

  • Product page features: size guides, bundles, badges, tabs and custom fields from metafields
  • Collection filters, sorting and grid layouts set up for how customers shop your catalog
  • Cart and checkout changes within what your plan allows. For Plus checkout work see Shopify Plus development

/03

Fixes and mobile

  • Mobile layout fixes for headers, menus, product galleries and forms
  • Cleanup after apps: leftover code removed, app features rebuilt in the theme where it makes sense
  • Theme updates that keep your custom code when the theme developer ships a new version

How We Customize a Shopify Theme

We change your current theme instead of replacing it, so your content, URLs and design stay in place.

custom Shopify discovery

Duplicate theme first

All work happens on a copy of your live theme. The live store is untouched until you approve.

custom business logic in Shopify

Theme editor friendly

New sections and settings show up in the theme editor, so your team can change text and images without code.

transparent custom development process

Fewer apps

When a feature can live in the theme, we build it there instead of adding another monthly app.

scalable custom Shopify architecture

Clear estimate

Each task gets an hour estimate before work starts, and you approve it.

Standards for Every Theme Change

How we keep your theme stable while we change it

structured custom Shopify planning

Code review

A tech lead reviews every change before it reaches your live theme.

clean custom Shopify code

Test theme first

Changes go to a duplicate theme first and reach production after your approval.

stable Shopify integrations and functionality

Version control

Theme code is kept in Git, so every change can be traced and rolled back.

performance optimization in custom Shopify development

Update-safe code

Custom code is documented, so it can be carried over when your theme gets a new version.

QA and validation for custom Shopify builds

Speed checked

Page speed is measured before and after each release, so new features don’t slow the store down.

post launch support for custom Shopify development

SEO-safe releases

Redirects, canonical tags and noindex settings are checked after every release.

Our Theme Customization Process

From your task list to changes on the live store

01

custom Shopify audit and discovery

Free store review

We look at your theme, apps and task list before you sign anything.

02

custom Shopify roadmap

Estimate

You get a list of tasks with the hours for each one.

03

build custom Shopify solution

Build on a copy

Changes are made on a duplicate of your live theme.

04

QA and launch for custom Shopify development

Review and QA

You check the preview link on desktop and mobile, and we fix what you flag.

05

support and iteration for custom Shopify builds

Publish

The updated theme goes live at a low-traffic hour, and we watch the store after release.

Who Needs Theme Customization

Stores with a theme that mostly works and a list of changes it can’t handle out of the box. Agencies can order the same work under their own brand through white label Shopify development.

brands needing custom Shopify store development

Stores on a premium theme

Brands that bought a theme from the Shopify Theme Store and need features it doesn’t include.

Shopify Plus custom development for complex operations

Stores running many apps

Shops where apps add page weight and monthly fees for features the theme could handle.

companies needing Shopify custom app development

Brands before a launch or sale

Stores that need new landing pages, product pages or promo sections by a fixed date.

custom Shopify theme development for growing brands

Stores on older themes

Shops on vintage themes that need sections on every page without a full redesign.

custom Shopify development services for ecommerce brands

Shopify Theme Customization FAQ

What is Shopify theme customization?

Shopify theme customization is changing an existing theme’s code and settings to add sections, templates and features it doesn’t include by default. It differs from theme development, where a new theme is built from scratch.

How much does Shopify theme customization cost?

At SPLIT Development, theme customization is billed from $35 per hour. Each task gets an hour estimate after a free store review, and you approve it before work starts.

Will customization break my theme updates?

Custom code can be overwritten when you install a new theme version. SPLIT Development documents every change and carries custom code over to the new version when you update.

Can I edit the custom sections myself?

Yes. New sections are built with settings in the Shopify theme editor, so your team can change text, images and layout options without code.

Should I customize my theme or build a new one?

Customization fits when the theme covers most of what you need and the changes are specific. A new theme fits when most pages need changes or you need a different design system.

Do you customize themes on Shopify Plus stores?

Yes. SPLIT Development customizes themes on Shopify and Shopify Plus stores, including the checkout changes Plus allows through Checkout Extensibility.