How to Choose a Shopify Plus Development Company in 2026

Cartoon storefront with a blue awning, a shopping cart and a red shopping bag beside two people under the word STORE

What a Shopify Plus development company does

A Shopify Plus development company designs, builds, and maintains stores on Shopify Plus, Shopify’s plan for high-volume and enterprise merchants. Typical work includes custom themes, checkout customization with Checkout Extensibility, Shopify Functions for discounts and shipping rules, B2B setup, app and ERP integrations, data migration, and ongoing speed and conversion improvements.

Choosing the right partner matters more on Plus than on standard Shopify plans. Plus stores tend to carry more products, more traffic, more integrations, and more revenue at risk during a launch or a migration. A mistake in checkout logic, tax settings, or inventory sync can cost real sales in a single afternoon.

This guide explains, as of October 2026, what to expect from a Shopify Plus agency, the questions that separate experienced teams from generalists, how to compare proposals, and the red flags to avoid. It reflects the checklist we use at Pros Inc when we review ecommerce builds, and it points to Shopify’s own documentation for platform details that change over time.

Developer pair beside a large browser window showing a code symbol, surrounded by gears on a blueprint grid — Plan checkout, Functions and integrations before the build starts.

When Shopify Plus makes sense

Shopify Plus is not the right plan for every store. It usually becomes worth a serious look when one or more of these apply:

You need more control over checkout, discounts, or shipping logic than standard plans allow.
You sell wholesale or B2B alongside direct-to-consumer and want both in one platform.
You run several stores for different countries, brands, or currencies.
You need deeper integrations with an ERP, warehouse system, or CRM.
Your order volume or flash-sale traffic has grown to the point where automation and support response times matter.

As of October 2026, Shopify publishes current plan features on its Shopify Plus page. Check it directly, because features and pricing are updated regularly.

Services to expect from a Shopify Plus agency

Most experienced agencies offer some or all of the following. Use the table to decide which ones you actually need before you request proposals.

Service	What it includes	Why it matters on Plus
Discovery and planning	Requirements, integrations, data map, launch plan	Prevents scope gaps and missed integrations
Theme design and build	Online Store 2.0 theme, sections, accessibility, mobile layout	Speed and conversion on high-traffic pages
Checkout customization	Checkout Extensibility, UI extensions, branding	Shopify has moved Plus checkout customization away from checkout.liquid
Shopify Functions	Custom discount, shipping, and payment rules	Replaces older script-based logic
B2B and wholesale	Company accounts, price lists, payment terms	Supports trade buyers in one store
Integrations	ERP, PIM, warehouse, CRM, marketing tools	Keeps orders, stock, and customers in sync
Migration	Products, customers, orders, URLs, redirects	Protects search traffic and history
Ongoing support	Monitoring, updates, speed and conversion work	Stores change constantly after launch

Shopify’s developer documentation on checkout apps and extensions and on B2B is the best place to confirm what is possible before you sign off on a plan.

How to choose a Shopify Plus development company

Work through these steps in order. They keep the comparison focused on evidence rather than sales pitches.

Write a short requirements brief. List your products, sales channels, integrations, markets, and any custom rules for discounts, shipping, or B2B pricing.
Check Shopify Partner status. Shopify lists vetted agencies in its Partner Directory. Partner status does not guarantee fit, but it confirms the agency works within Shopify’s program.
Review live Plus stores they built. Ask for stores you can visit today, and ask what the agency did on each one. Test the speed and checkout on your own phone.
Call references. Speak with at least two past clients about communication, deadlines, budget, and post-launch support.
Ask about their technical approach. They should explain how they use Checkout Extensibility, Shopify Functions, and apps versus custom code, and why.
Confirm the migration plan. For replatforming, ask how they will move data, map old URLs, set 301 redirects, and protect search traffic.
Compare like-for-like proposals. Ask each agency to price the same brief, with phases, deliverables, and assumptions written out.
Agree on ownership and handover. You should own the store, theme code, app accounts, and documentation.

Questions to ask in the first call

Which Plus stores have you launched or migrated in the past year, and what was your role?
Who exactly will work on our project, and are any parts subcontracted?
How do you approach checkout changes now that checkout.liquid has been replaced by Checkout Extensibility?
How do you decide between an app, a Shopify Function, and custom code?
How do you test speed and Core Web Vitals before launch?
What does support look like in the first 90 days after launch?
How do you document the build so another team could maintain it?

Good agencies welcome these questions and answer with specific examples. Vague answers about “best practices” without detail are a warning sign.

Large clipboard checklist with green ticks next to a magnifying glass and two people reviewing it — Compare agencies against the same written checklist.

Shopify Plus agency vs freelancer vs in-house team

Factor	Plus agency	Freelancer	In-house developer
Range of skills	Design, development, integrations, QA, project management	Usually one or two specialties	Depends on the person
Capacity for launches	High; several people at once	Limited by one person’s time	Limited by team size
Cost structure	Project fee plus support retainer	Hourly or project rate	Salary, benefits, tools
Best for	Builds, migrations, complex integrations	Small changes and single features	Steady, ongoing development
Main risk	Higher cost; less day-to-day focus	Single point of failure	Hiring time and narrow skills

Many Plus merchants use an agency for the launch or migration and a smaller retainer or in-house developer for ongoing changes. If you are comparing Shopify Plus with other platforms first, our guide to Magento web development covers the open-source alternative, and our article on hiring a Drupal development agency covers content-heavy builds.

How to compare proposals side by side

Proposals often look different on purpose, which makes them hard to compare. Put each one into the same simple grid before you decide:

Scope: which templates, features, integrations, and stores are included, and which are explicitly excluded.
Assumptions: who supplies content, product data, and photography, and who owns third-party app costs.
Team: named roles, time allocated, and whether any work is subcontracted or offshore.
Timeline: phases, review points, and what happens if your feedback is late.
Testing: what is tested, on which devices, and who signs off.
Launch and support: go-live plan, the warranty period for bugs, and the monthly cost of ongoing support.
Price structure: fixed fee, time and materials, or a mix, plus how change requests are priced.

The lowest price is rarely the cheapest outcome if it leaves out testing, redirects, or support. Ask each agency to fill in the same grid, and treat missing answers as a risk to clarify before signing.

Red flags when hiring a Shopify Plus partner

No live Plus stores to show, or only screenshots.
A plan that depends on heavy theme hacks instead of Shopify’s supported extension points.
No mention of 301 redirects or SEO during a migration.
Fixed launch dates promised before discovery is done.
Agency-owned store or app accounts.
Many apps proposed without a clear reason, or no plan for marketing after launch; see our guide to online marketing services for small businesses. Each app can add scripts that slow pages; see our Shopify speed optimization guide for how to test that.

What a typical Shopify Plus project looks like

Every project is different, but most follow a similar path:

Discovery: requirements, integrations, data, and success measures.
Design: wireframes and visual design for key templates, tested on mobile first.
Build: theme development, checkout and Functions work, app setup, integrations.
Data and redirects: product, customer, and order import, plus a full 301 redirect map from old URLs.
Testing: orders, payments, taxes, shipping, discounts, B2B pricing, speed, and accessibility.
Launch: a planned go-live window with rollback steps and close monitoring.
Support: fixes, performance tuning, and a backlog of improvements.

Timelines depend on scope. As general industry planning ranges, not quotes or guarantees, a theme rebuild may take a few weeks, while a full migration with integrations often takes several months. Ask each agency to explain the timeline for your brief in writing.

After launch: what good support looks like

Launch day is the start of the work, not the end. In the first weeks, watch orders, payment failures, tax and shipping totals, and customer service tickets every day. A good agency monitors these with you and fixes issues quickly within an agreed warranty period.

After that, most Plus stores benefit from a steady monthly rhythm:

Performance checks on key templates after every theme or app change.
Conversion reviews of product, cart, and checkout steps using Google Analytics 4 funnels.
Platform updates as Shopify releases new checkout, Functions, and B2B features.
A prioritized backlog of improvements agreed with your team each month.
Documentation updates so new staff or another agency can follow how the store works.

Agree on response times for urgent issues, such as checkout errors, and for routine requests. Put both in the support agreement, along with how hours are tracked and reported.

Frequently asked questions

What is the difference between Shopify and Shopify Plus?

Shopify Plus is Shopify’s plan for high-volume and enterprise merchants. It adds deeper checkout customization, Shopify Functions for custom business logic, B2B features, more stores under one organization, and higher levels of support. Shopify lists the current differences on its Shopify Plus pages.

How much does a Shopify Plus development company cost?

Costs depend on scope, integrations, and design work. As general industry planning ranges, not quotes or guarantees, focused theme projects can start in the low five figures, while full migrations with ERP integrations often cost much more. Ask agencies to price the same written brief so you can compare fairly.

How long does a Shopify Plus migration take?

A simple migration may take a few weeks, while a complex replatforming with custom integrations, B2B, and multiple stores often takes several months. Discovery, data mapping, testing, and redirects take longer than most merchants expect, so build them into the plan from the start.

Do I need a Shopify Plus partner agency to use Shopify Plus?

No. Shopify Plus merchants can use in-house teams or freelancers. A partner agency helps most with launches, migrations, and complex integrations, where a team with design, development, testing, and project management skills reduces risk during the busiest stage.

Can a Shopify Plus agency keep my SEO rankings during a migration?

No one can guarantee rankings, but a careful agency greatly reduces the risk. They should map every old URL to a new one with 301 redirects, keep page titles and content where they perform well, submit updated sitemaps, and monitor Google Search Console after launch.

What should I own after a Shopify Plus project ends?

You should own the Shopify store, the theme code, all app and integration accounts, your domain, analytics, and complete documentation. Make this part of the contract, so you can change agencies or bring work in house without losing access or history.

Next steps

Write a one-page brief with your products, channels, integrations, and goals, then use the checklist above to compare two or three agencies. If you would like an independent review of a Shopify Plus proposal or your current store, the Pros Inc team can go through it with you. For help choosing marketing partners more broadly, read our guide on how to choose an internet marketing firm.