---
title: "I Will Build a Custom Shopify App for Your Shopify Plus Store"
url: https://zinnhub.com/zinns/create-a-custom-shopify-app-for-your-shopify-plus-store/
description: "Get a bespoke Shopify custom app with UI extensions and advanced checkout customisation, built exclusively for Shopify Plus merchants by London-based ecommerce developers."
published: 2025-12-15T06:03:15+00:00
modified: 2026-10-19T17:10:16+00:00
language: en-GB
---

# I Will Build a Custom Shopify App for Your Shopify Plus Store

If you run a [Shopify Plus](https://zinnhub.com/zinns/migrate-between-shopify-shopify-plus-magento-bigcommerce-woocommerce-opencart-2/) store, you already know that the standard checkout is a ceiling — not a floor. This service tears that ceiling off.

[Zinn Digital](https://zinnhub.com/zinns/professional-react-nextjs-website-development-by-zinn-digital/) builds fully custom Shopify apps with Checkout UI Extensions and Shopify Functions, giving your Plus store the bespoke checkout experience your brand and your customers deserve. Whether you need sophisticated discount logic, tailored shipping rules, expanded payment options, or a checkout that mirrors your brand identity pixel-perfectly, this is the service that delivers it.

Custom Shopify app development at this level is not a template job. Every solution is engineered from the ground up to fit your store’s specific requirements — not bolted onto a generic plugin that half-works.

\*\*What this service covers:\*\*

We design, develop, and deliver a functional custom Shopify app that integrates directly with your Shopify Plus store. At the entry tier, this includes a custom app with a Shopify UI extension — the essential building block for checkout customisation. As you scale up through tiers, the scope expands to cover more complex functionality, deeper integrations, and more sophisticated Shopify Functions logic.

The development process is straightforward: you share your store details and requirements, we assess the scope, get to work, and deliver a fully functional solution within the agreed timeframe. You’ll have the opportunity to request revisions so the final output matches your expectations.

\*\*Who this is for:\*\*

This service is built exclusively for Shopify Plus merchants. Shopify Functions and Checkout UI Extensions are not available on standard Shopify plans — if you’re on a standard plan, this service is not the right fit. If you are on Shopify Plus and want to unlock the full power of your checkout, this is precisely what you need.

\*\*Why Zinn Digital:\*\*

Zinn Digital is a London-based digital development team specialising in Shopify Plus solutions. The focus is on building sustainable, scalable custom functionality that goes beyond what off-the-shelf apps can offer. Every Zinn is crafted with precision, delivered with clarity, and supported through clear communication via the order manager throughout the project.

Ready to transform your checkout into a conversion engine? Select the package that matches your scope and let’s build something that genuinely moves the needle for your business.