The short answer: in Ireland in 2026, most custom Shopify work lands between a few hundred euro (a theme tweak) and €15,000+ (a full private app or checkout integration). A private app for your own store typically runs €3,000–€12,000; a Shopify Functions checkout integration from around €8,000. The right number depends entirely on which of four very different things you actually need — and often the honest answer is that an existing app does the job for €20 a month.
"Custom Shopify development" covers four tiers with very different costs:
The single biggest lever on price is keeping the first version narrow: build the core workflow, prove it, then extend.
For a defined scope, fixed price is the norm for good small-business work — it protects you from overruns and forces the developer to scope properly. "We'll bill hourly and see how it goes" shifts the budget risk onto you. Before signing anything, make sure the scope, exclusions, code ownership and support are all written down. (If you've got a quote and aren't sure, that's exactly what a free quote sanity check is for.)
The Grow Digital Voucher co-funds off-the-shelf, ready-made software — not bespoke or custom development. So it generally can't be applied to a custom Shopify app or a bespoke build. Confirm eligibility with your Local Enterprise Office, and be wary of anyone who tells you a custom build is voucher-funded without that confirmation.
Often, no — and a good developer will tell you. For commodity needs (email, reviews, search, basic reporting) an App Store app at €10–50/month beats custom on cost and maintenance every time. Custom earns its price when no app fits, when the workflow is your competitive edge, when you need checkout-time logic, or when data must stay on EU infrastructure. (More on that call: custom vs App Store Shopify.)
Document what you have and what you need: who uses it, the data involved, what's manual today, and what "done" looks like. The clearer the brief, the tighter (and cheaper) the quote — and the less room for surprise costs later.
It depends on the type. A theme or Liquid customisation is typically a few hundred to a few thousand euro; a private app (your store only) usually €3,000–€12,000; a Shopify Functions integration for checkout logic from around €8,000; a public App Store app is larger. Most small-business projects land in the €3,000–€15,000 range, quoted fixed-price for a defined scope.
Usually the App Store app, for any common need — an app at €10–50/month costs far less over three years than a custom build. Custom wins when no app fits, when you need Shopify Functions or checkout logic, when the workflow is your own IP, or when data must stay on EU infrastructure.
No. The Grow Digital Voucher co-funds off-the-shelf, ready-made software, not bespoke or custom development. Confirm eligibility with your Local Enterprise Office, and never assume a custom build is voucher-funded.
For a defined scope, fixed price protects you from overruns and is the norm for good small-business work. "We'll bill hourly and see how it goes" shifts the budget risk onto you. Make sure the scope, exclusions, ownership and support are written down before you sign.
Scope and integrations. Multiple user roles, real-time checkout logic (Shopify Functions), third-party integrations, data migration, and ongoing support all add cost. A clear, narrow first version keeps the price down.
Weighing up a custom Shopify build? Ask us for free advice — we'll give you a realistic price range and tell you honestly whether custom, an app, or a small fix is the right call. Got a quote already? Try a free quote sanity check, or see typical project budgets.